diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index e21015b..21776a7 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,20 +1,20 @@
 set(LIB_SOURCES "database.c" "bitmap.c")
 
-add_library("imgdup" SHARED ${LIB_SOURCES})
-set_property(TARGET "imgdup" PROPERTY SONAME ${VERSION})
-install(TARGETS "imgdup" LIBRARY DESTINATION "lib")
+add_library("simdb" SHARED ${LIB_SOURCES})
+set_property(TARGET "simdb" PROPERTY SONAME ${VERSION})
+install(TARGETS "simdb" LIBRARY DESTINATION "lib")
 
-add_executable("imdb-1to2" "imdb-1to2.c")
-install(TARGETS "imdb-1to2" RUNTIME DESTINATION "bin")
+add_executable("simdb-1to2" "simdb-1to2.c")
+install(TARGETS "simdb-1to2" RUNTIME DESTINATION "bin")
 
-add_executable("imdb-query" "imdb-query.c")
-target_link_libraries("imdb-query" "imgdup")
-install(TARGETS "imdb-query" RUNTIME DESTINATION "bin")
+add_executable("simdb-query" "simdb-query.c")
+target_link_libraries("simdb-query" "simdb")
+install(TARGETS "simdb-query" RUNTIME DESTINATION "bin")
 
 find_package(ImageMagick COMPONENTS MagickCore MagickWand)
 
-add_executable("imdb-write" "imdb-write.c" "sample.c")
-target_link_libraries("imdb-write" "imgdup")
-target_link_libraries("imdb-write" ${ImageMagick_MagickCore_LIBRARY})
-target_link_libraries("imdb-write" ${ImageMagick_MagickWand_LIBRARY})
-install(TARGETS "imdb-write" RUNTIME DESTINATION "bin")
+add_executable("simdb-write" "simdb-write.c" "sample.c")
+target_link_libraries("simdb-write" "simdb")
+target_link_libraries("simdb-write" ${ImageMagick_MagickCore_LIBRARY})
+target_link_libraries("simdb-write" ${ImageMagick_MagickWand_LIBRARY})
+install(TARGETS "simdb-write" RUNTIME DESTINATION "bin")
diff --git a/src/common.h b/src/common.h
index 5c84253..d502dc4 100644
--- a/src/common.h
+++ b/src/common.h
@@ -27,5 +27,5 @@
 extern int image_add(uint64_t, char *path);
 extern int image_del(uint64_t);
 extern int image_exists(uint64_t);
-extern int image_search(uint64_t, imdb_rec_t **data, size_t limit);
+extern int image_search(uint64_t, simdb_rec_t **data, size_t limit);
 */
diff --git a/src/database.c b/src/database.c
index fa579fc..523a9de 100644
--- a/src/database.c
+++ b/src/database.c
@@ -22,32 +22,32 @@
   errno = 0; \
   memset((buf), 0x0, (len)); \
   bytes = pread((db)->fd, (buf), (len), (off)); \
-  if (errno) { return IMDB_ERR_SYSTEM; }
+  if (errno) { return SIMDB_ERR_SYSTEM; }
 
 #define DB_WRITE(db, buf, len, off) \
   errno = 0; \
   bytes = pwrite((db)->fd, (buf), (len), (off)); \
-  if (errno) { return IMDB_ERR_SYSTEM; }
+  if (errno) { return SIMDB_ERR_SYSTEM; }
 
-const char *imdb_hdr_fmt = "IMDB v%02u, CAPS: %s;";
+const char *simdb_hdr_fmt = "IMDB v%02u, CAPS: %s;";
 
 bool
-imdb_create(const char *path) {
+simdb_create(const char *path) {
   ssize_t bytes = 0;
-  unsigned char buf[IMDB_REC_LEN];
+  unsigned char buf[SIMDB_REC_LEN];
   const char *caps = "M-R";
   bool result = false;
   int fd = -1;
 
-  memset(buf, 0x0, sizeof(char) * IMDB_REC_LEN);
+  memset(buf, 0x0, sizeof(char) * SIMDB_REC_LEN);
 
   if ((fd = creat(path, 0644)) < 0)
     return result;
 
-  snprintf((char *) buf, IMDB_REC_LEN, imdb_hdr_fmt, IMDB_VERSION, caps);
+  snprintf((char *) buf, SIMDB_REC_LEN, simdb_hdr_fmt, SIMDB_VERSION, caps);
 
-  bytes = pwrite(fd, buf, IMDB_REC_LEN, 0);
-  if (bytes == IMDB_REC_LEN)
+  bytes = pwrite(fd, buf, SIMDB_REC_LEN, 0);
+  if (bytes == SIMDB_REC_LEN)
     result = true; /* success */
 
   close(fd);
@@ -55,12 +55,12 @@ imdb_create(const char *path) {
   return result;
 }
 
-imdb_db_t *
-imdb_open(const char *path, int mode, int *error) {
-  imdb_db_t *db = NULL;
+simdb_t *
+simdb_open(const char *path, int mode, int *error) {
+  simdb_t *db = NULL;
   ssize_t bytes = 0;
   struct stat st;
-  char buf[IMDB_REC_LEN] = "\0";
+  char buf[SIMDB_REC_LEN] = "\0";
   int flags = 0, fd = -1;
   char *p;
 
@@ -68,31 +68,31 @@ imdb_open(const char *path, int mode, int *error) {
   assert(error != NULL);
 
   if (stat(path, &st) < 0) {
-    *error = IMDB_ERR_SYSTEM;
+    *error = SIMDB_ERR_SYSTEM;
     return NULL;
   }
 
-  if ((fd = open(path, (mode & IMDB_FLAG_WRITE) ? O_RDWR : O_RDONLY)) < 0) {
-    *error = IMDB_ERR_SYSTEM;
+  if ((fd = open(path, (mode & SIMDB_FLAG_WRITE) ? O_RDWR : O_RDONLY)) < 0) {
+    *error = SIMDB_ERR_SYSTEM;
     return NULL;
   }
 
   errno = 0;
-  bytes = pread(fd, buf, IMDB_REC_LEN, 0);
-  if (bytes < IMDB_REC_LEN) {
-    *error = errno ? IMDB_ERR_SYSTEM : IMDB_ERR_CORRUPTDB;
+  bytes = pread(fd, buf, SIMDB_REC_LEN, 0);
+  if (bytes < SIMDB_REC_LEN) {
+    *error = errno ? SIMDB_ERR_SYSTEM : SIMDB_ERR_CORRUPTDB;
     return NULL;
   }
 
   p = buf + 0;
   if (memcmp("IMDB", p, 4) != 0) {
-    *error = IMDB_ERR_CORRUPTDB;
+    *error = SIMDB_ERR_CORRUPTDB;
     return NULL;
   }
 
   p = buf + 6;
-  if (atoi(p) != IMDB_VERSION) {
-    *error = IMDB_ERR_WRONGVERS;
+  if (atoi(p) != SIMDB_VERSION) {
+    *error = SIMDB_ERR_WRONGVERS;
     return NULL;
   }
 
@@ -102,22 +102,22 @@ imdb_open(const char *path, int mode, int *error) {
     return NULL;
   }
 
-  if (mode & IMDB_FLAG_WRITE)
-    flags |= IMDB_FLAG_WRITE;
+  if (mode & SIMDB_FLAG_WRITE)
+    flags |= SIMDB_FLAG_WRITE;
 
   /* all seems to be ok */
 
-  if ((db = calloc(1, sizeof(imdb_db_t))) == NULL) {
-    *error = IMDB_ERR_OOM;
+  if ((db = calloc(1, sizeof(simdb_t))) == NULL) {
+    *error = SIMDB_ERR_OOM;
     return NULL;
   }
 
   p = buf + 16;
   for (size_t i = 0; i < 8 && *p != '\0'; p++) {
     switch (*p) {
-      case 'M' : flags |= IMDB_CAP_BITMAP; break;
-      case 'C' : flags |= IMDB_CAP_COLORS; break;
-      case 'R' : flags |= IMDB_CAP_RATIO;  break;
+      case 'M' : flags |= SIMDB_CAP_BITMAP; break;
+      case 'C' : flags |= SIMDB_CAP_COLORS; break;
+      case 'R' : flags |= SIMDB_CAP_RATIO;  break;
       case ';' : i = 9; /* end of flags */ break;
       default: /* ignore */ break;
     }
@@ -132,7 +132,7 @@ imdb_open(const char *path, int mode, int *error) {
 }
 
 void
-imdb_close(imdb_db_t *db)
+simdb_close(simdb_t *db)
 {
   assert(db != NULL);
 
@@ -141,26 +141,26 @@ imdb_close(imdb_db_t *db)
 }
 
 const char *
-imdb_error(int error) {
-   if (error == IMDB_SUCCESS) {
+simdb_error(int error) {
+   if (error == SIMDB_SUCCESS) {
      return "success";
-   } else if (error == IMDB_ERR_SYSTEM) {
+   } else if (error == SIMDB_ERR_SYSTEM) {
      return strerror(errno);
-   } else if (error == IMDB_ERR_OOM) {
+   } else if (error == SIMDB_ERR_OOM) {
      return "can't allocate memory";
-   } else if (error == IMDB_ERR_CORRUPTDB) {
+   } else if (error == SIMDB_ERR_CORRUPTDB) {
      return "database corrupted";
-   } else if (error == IMDB_ERR_WRONGVERS) {
+   } else if (error == SIMDB_ERR_WRONGVERS) {
      return "database version differs from library version";
-   } else if (error == IMDB_ERR_READONLY) {
+   } else if (error == SIMDB_ERR_READONLY) {
      return "database opened in read-only mode";
-   } else if (error == IMDB_ERR_NXRECORD) {
+   } else if (error == SIMDB_ERR_NXRECORD) {
      return "no such record in database";
    }
    return "unknown error";
 }
 
-int imdb_read_rec(imdb_db_t *db, imdb_rec_t *rec)
+int simdb_read_rec(simdb_t *db, simdb_rec_t *rec)
 {
   ssize_t bytes = 0;
 
@@ -168,10 +168,10 @@ int imdb_read_rec(imdb_db_t *db, imdb_rec_t *rec)
   assert(rec != NULL);
   assert(rec->num > 0);
 
-  DB_READ(db, rec->data, IMDB_REC_LEN, rec->num * IMDB_REC_LEN);
+  DB_READ(db, rec->data, SIMDB_REC_LEN, rec->num * SIMDB_REC_LEN);
 
-  if (bytes != IMDB_REC_LEN)
-    return errno ? IMDB_ERR_SYSTEM : IMDB_ERR_NXRECORD;
+  if (bytes != SIMDB_REC_LEN)
+    return errno ? SIMDB_ERR_SYSTEM : SIMDB_ERR_NXRECORD;
 
   if (rec->data[0] != 0xFF)
     return 0;
@@ -179,7 +179,7 @@ int imdb_read_rec(imdb_db_t *db, imdb_rec_t *rec)
   return 1;
 }
 
-int imdb_write_rec(imdb_db_t *db, imdb_rec_t *rec)
+int simdb_write_rec(simdb_t *db, simdb_rec_t *rec)
 {
   ssize_t bytes = 0;
 
@@ -187,18 +187,18 @@ int imdb_write_rec(imdb_db_t *db, imdb_rec_t *rec)
   assert(rec != NULL);
   assert(rec->num > 0);
 
-  if (!(db->flags & IMDB_FLAG_WRITE))
-    return IMDB_ERR_READONLY;
+  if (!(db->flags & SIMDB_FLAG_WRITE))
+    return SIMDB_ERR_READONLY;
 
-  DB_WRITE(db, rec->data, IMDB_REC_LEN, rec->num * IMDB_REC_LEN);
+  DB_WRITE(db, rec->data, SIMDB_REC_LEN, rec->num * SIMDB_REC_LEN);
 
-  if (bytes != IMDB_REC_LEN)
-    return IMDB_ERR_SYSTEM;
+  if (bytes != SIMDB_REC_LEN)
+    return SIMDB_ERR_SYSTEM;
 
   return 1;
 }
 
-int imdb_read_blk(imdb_db_t *db, imdb_block_t *blk)
+int simdb_read_blk(simdb_t *db, simdb_block_t *blk)
 {
   ssize_t bytes = 0;
 
@@ -208,15 +208,15 @@ int imdb_read_blk(imdb_db_t *db, imdb_block_t *blk)
   assert(blk->records > 0);
 
   FREE(blk->data);
-  CALLOC(blk->data, blk->records, IMDB_REC_LEN);
-  DB_READ(db, blk->data, blk->records * IMDB_REC_LEN, blk->start * IMDB_REC_LEN);
-  blk->records = bytes / IMDB_REC_LEN;
+  CALLOC(blk->data, blk->records, SIMDB_REC_LEN);
+  DB_READ(db, blk->data, blk->records * SIMDB_REC_LEN, blk->start * SIMDB_REC_LEN);
+  blk->records = bytes / SIMDB_REC_LEN;
 
   return blk->records;
 }
 
 uint64_t
-imdb_records_count(imdb_db_t * const db) {
+simdb_records_count(simdb_t * const db) {
   struct stat st;
   off_t size = 0;
 
@@ -225,7 +225,7 @@ imdb_records_count(imdb_db_t * const db) {
   fstat(db->fd, &st);
   size = st.st_size;
 
-  return size / IMDB_REC_LEN;
+  return size / SIMDB_REC_LEN;
 }
 
 float
@@ -235,17 +235,17 @@ ratio_from_rec_data(unsigned char * const data) {
   iw = *((uint16_t *)(data + REC_OFF_IW));
   ih = *((uint16_t *)(data + REC_OFF_IH));
 
-  return (iw > 0 && ih > 0) ? ((float) iw / ih) : 0.0;
+   return (iw > 0 && ih > 0) ? ((float) iw / ih) : 0.0;
 }
 
 int
-imdb_search(imdb_db_t     * const db,
-            imdb_rec_t    * const sample,
-            imdb_search_t * const search,
-            imdb_match_t  **matches)
+simdb_search(simdb_t        * const db,
+             simdb_rec_t    * const sample,
+             simdb_search_t * const search,
+             simdb_match_t  **matches)
 {
-  imdb_block_t blk;
-  imdb_match_t match;
+  simdb_block_t blk;
+  simdb_match_t match;
   const int blk_size = 4096;
   uint64_t found = 0;
   unsigned int i = 0;
@@ -261,12 +261,12 @@ imdb_search(imdb_db_t     * const db,
   assert(search->maxdiff_ratio  >= 0.0 && search->maxdiff_ratio  <= 1.0);
   assert(search->maxdiff_bitmap >= 0.0 && search->maxdiff_bitmap <= 1.0);
 
-  memset(&blk,   0x0, sizeof(imdb_block_t));
-  memset(&match, 0x0, sizeof(imdb_match_t));
+  memset(&blk,   0x0, sizeof(simdb_block_t));
+  memset(&match, 0x0, sizeof(simdb_match_t));
   blk.start = 1;
   blk.records = blk_size;
 
-  if ((ret = imdb_read_rec(db, sample)) < 1)
+  if ((ret = simdb_read_rec(db, sample)) < 1)
     return ret;
 
   if (search->limit == 0)
@@ -275,11 +275,11 @@ imdb_search(imdb_db_t     * const db,
   if (search->maxdiff_ratio > 0.0)
     ratio_s = ratio_from_rec_data(sample->data);
 
-  CALLOC(*matches, search->limit, sizeof(imdb_match_t));
+  CALLOC(*matches, search->limit, sizeof(simdb_match_t));
 
-  while (imdb_read_blk(db, &blk) > 0) {
+  while (simdb_read_blk(db, &blk) > 0) {
     p = blk.data;
-    for (i = 0; i < blk.records; i++, p += IMDB_REC_LEN) {
+    for (i = 0; i < blk.records; i++, p += SIMDB_REC_LEN) {
       if (*(p + REC_OFF_RU) == 0x0)
         continue; /* record missing */
 
@@ -304,7 +304,7 @@ imdb_search(imdb_db_t     * const db,
 
       /* create match record */
       match.num = blk.start + i;
-      memcpy(&(*matches)[found], &match, sizeof(imdb_match_t));
+      memcpy(&(*matches)[found], &match, sizeof(simdb_match_t));
       found++;
       if (found >= search->limit)
         break;
@@ -319,26 +319,26 @@ imdb_search(imdb_db_t     * const db,
 }
 
 uint64_t
-imdb_usage_map(imdb_db_t * const db,
-               char     ** const map) {
+simdb_usage_map(simdb_t * const db,
+               char    ** const map) {
   const int blk_size = 4096;
-  imdb_block_t blk;
+  simdb_block_t blk;
   uint64_t records;
   unsigned char *r; /* mnemonics : block, record */
   char *m = NULL;   /* mnemonics : map */
 
-  memset(&blk, 0x0, sizeof(imdb_block_t));
+  memset(&blk, 0x0, sizeof(simdb_block_t));
 
-  records = imdb_records_count(db);
+  records = simdb_records_count(db);
   CALLOC(*map, records + 1, sizeof(char));
 
   m = *map;
   blk.start = 1;
   blk.records = blk_size;
 
-  while (imdb_read_blk(db, &blk) > 0) {
+  while (simdb_read_blk(db, &blk) > 0) {
     r = blk.data;
-    for (unsigned int i = 0;  i < blk.records;  i++, m++, r += IMDB_REC_LEN) {
+    for (unsigned int i = 0;  i < blk.records;  i++, m++, r += SIMDB_REC_LEN) {
       *m = (r[REC_OFF_RU] == 0xFF) ? CHAR_USED : CHAR_NONE;
     }
     blk.start += blk_size;
@@ -349,24 +349,24 @@ imdb_usage_map(imdb_db_t * const db,
 }
 
 uint16_t
-imdb_usage_slice(imdb_db_t * const db,
-                 char     ** const map,
-                 uint64_t  offset,
-                 uint16_t  limit) {
-  imdb_block_t blk;
+simdb_usage_slice(simdb_t   * const db,
+                  char     ** const map,
+                  uint64_t  offset,
+                  uint16_t  limit) {
+  simdb_block_t blk;
   unsigned char *r; /* mnemonics : block, record */
   char *m = NULL;   /* mnemonics : map */
 
-  memset(&blk, 0x0, sizeof(imdb_block_t));
+  memset(&blk, 0x0, sizeof(simdb_block_t));
   CALLOC(*map, limit + 1, sizeof(char));
 
   m = *map;
   blk.start = offset;
   blk.records = limit;
 
-  limit = imdb_read_blk(db, &blk);
+  limit = simdb_read_blk(db, &blk);
   r = blk.data;
-  for (uint16_t i = 0;  i < blk.records;  i++, m++, r += IMDB_REC_LEN) {
+  for (uint16_t i = 0;  i < blk.records;  i++, m++, r += SIMDB_REC_LEN) {
     *m = (r[REC_OFF_RU] == 0xFF) ? CHAR_USED : CHAR_NONE;
   }
 
diff --git a/src/database.h b/src/database.h
index 808e9c3..4996675 100644
--- a/src/database.h
+++ b/src/database.h
@@ -1,32 +1,32 @@
 #ifndef HAS_DATABASE_H
 #define HAS_DATABASE_H 1
 
-#define IMDB_REC_LEN 48
-#define IMDB_VERSION  2
+#define SIMDB_REC_LEN 48
+#define SIMDB_VERSION  2
 
 /* runtime flags */
-#define IMDB_FLAG_WRITE    1 << (0 + 0)
+#define SIMDB_FLAG_WRITE    1 << (0 + 0)
 
 /* database capabilities */
-#define IMDB_CAP_BITMAP    1 << (8 + 0)
-#define IMDB_CAP_COLORS    1 << (8 + 1)
-#define IMDB_CAP_RATIO     1 << (8 + 2)
+#define SIMDB_CAP_BITMAP    1 << (8 + 0)
+#define SIMDB_CAP_COLORS    1 << (8 + 1)
+#define SIMDB_CAP_RATIO     1 << (8 + 2)
 /* 3 used, 5 reserved */
 
-#define IMDB_SUCCESS          0
+#define SIMDB_SUCCESS          0
 /* database errors */
-#define IMDB_ERR_SYSTEM      -1 /* see errno for details */
-#define IMDB_ERR_OOM         -2 /* can't allocate memory */
-#define IMDB_ERR_CORRUPTDB   -3 /* empty or currupted database */
-#define IMDB_ERR_WRONGVERS   -4 /* database version mismatch */
-#define IMDB_ERR_NXRECORD    -5 /* no such record in database */
-#define IMDB_ERR_READONLY    -6 /* database opened in read-only mode */
+#define SIMDB_ERR_SYSTEM      -1 /* see errno for details */
+#define SIMDB_ERR_OOM         -2 /* can't allocate memory */
+#define SIMDB_ERR_CORRUPTDB   -3 /* empty or currupted database */
+#define SIMDB_ERR_WRONGVERS   -4 /* database version mismatch */
+#define SIMDB_ERR_NXRECORD    -5 /* no such record in database */
+#define SIMDB_ERR_READONLY    -6 /* database opened in read-only mode */
 
 typedef struct {
   int fd;
   int flags;
   char path[PATH_MAX];
-} imdb_db_t;
+} simdb_t;
 
 /**
   Database header format - fixed length, 48 bytes
@@ -70,15 +70,15 @@ typedef struct {
   uint64_t start;
   size_t records;
   unsigned char *data;
-} imdb_block_t;
+} simdb_block_t;
 
 /**
  * database record
  */
 typedef struct {
   uint64_t num;
-  unsigned char data[IMDB_REC_LEN];
-} imdb_rec_t;
+  unsigned char data[SIMDB_REC_LEN];
+} simdb_rec_t;
 
 /**
  * search parameters
@@ -88,7 +88,7 @@ typedef struct {
   uint8_t limit;        /**< max results */
   float maxdiff_bitmap; /**< max difference of luma bitmaps */
   float maxdiff_ratio;  /**< max difference of ratios, default - 7% */
-} imdb_search_t;
+} simdb_search_t;
 
 /**
  * search matches
@@ -97,16 +97,16 @@ typedef struct {
   uint64_t num;       /**< record id */
   float diff_ratio;   /**< difference of ratio */
   float diff_bitmap;  /**< difference of bitmap */
-} imdb_match_t;
+} simdb_match_t;
 
 /**
  * @returns 1 on success, 0 if record missing and <0 on error
  */
-int imdb_read_rec (imdb_db_t *db, imdb_rec_t *rec);
-int imdb_write_rec(imdb_db_t *db, imdb_rec_t *rec);
+int simdb_read_rec (simdb_t *db, simdb_rec_t *rec);
+int simdb_write_rec(simdb_t *db, simdb_rec_t *rec);
 
-int imdb_read_blk (imdb_db_t *db, imdb_block_t *blk);
-int imdb_write_blk(imdb_db_t *db, imdb_block_t *blk);
+int simdb_read_blk (simdb_t *db, simdb_block_t *blk);
+int simdb_write_blk(simdb_t *db, simdb_block_t *blk);
 
 /**
  * @brief Creates empty database at given path
@@ -115,29 +115,29 @@ int imdb_write_blk(imdb_db_t *db, imdb_block_t *blk);
  * @note See errno value for details
  * @todo 2nd arg: caps
  */
-bool imdb_create(const char *path);
+bool simdb_create(const char *path);
 
 /**
  * @brief Open database at given path
  * @param path Path to database
- * @param mode Database open modes. See IMDB_FLAG_* defines above
+ * @param mode Database open modes. See SIMDB_FLAG_* defines above
  * @param error Pointer to error code storage
  * @returns Pointer to database handle on success, NULL on error
- * @note use @a imdb_error() to get error description
+ * @note use @a simdb_error() to get error description
  */
-imdb_db_t * imdb_open(const char *path, int mode, int *error);
+simdb_t * simdb_open(const char *path, int mode, int *error);
 
 /**
  * @brief Close database and free associated resources
  * @param db Database handle
  */
-void imdb_close(imdb_db_t *db);
+void simdb_close(simdb_t *db);
 
 /**
  * @brief Get error desctiption by error code
- * @param error Error code, see IMDB_ERR_* defines above
+ * @param error Error code, see SIMDB_ERR_* defines above
  */
-const char * imdb_error(int code);
+const char * simdb_error(int code);
 
 float
 ratio_from_rec_data(unsigned char * const data);
@@ -146,23 +146,23 @@ ratio_from_rec_data(unsigned char * const data);
  @returns: >0 if found some matches, 0 if nothing found, <0 on error
  */
 int
-imdb_search(imdb_db_t     * const db,
-            imdb_rec_t    * const sample,
-            imdb_search_t * const search,
-            imdb_match_t  ** matches);
+simdb_search(simdb_t         * const db,
+             simdb_rec_t     * const sample,
+             simdb_search_t  * const search,
+             simdb_match_t  ** matches);
 
 /**
  @returns: number of records in database
 */
 uint64_t
-imdb_records_count(imdb_db_t * const db);
+simdb_records_count(simdb_t * const db);
 
 /**
   @brief   fills buffer 'map' according to records existense in database
   @returns records processed (and also buffer size)
 */
 uint64_t
-imdb_usage_map(imdb_db_t * const db,
+simdb_usage_map(simdb_t * const db,
                char     ** const map);
 
 /**
@@ -172,7 +172,7 @@ imdb_usage_map(imdb_db_t * const db,
   @returns records processed (and also buffer size)
 */
 uint16_t
-imdb_usage_slice(imdb_db_t * const db,
+simdb_usage_slice(simdb_t * const db,
                  char     ** const map,
                  uint64_t  offset,
                  uint16_t  limit);
diff --git a/src/sample.c b/src/sample.c
index 5e72491..23f6eff 100644
--- a/src/sample.c
+++ b/src/sample.c
@@ -6,8 +6,8 @@
 #include <wand/magick_wand.h>
 
 int
-imdb_sample(imdb_rec_t * const rec,
-            const char * const source)
+simdb_sample(simdb_rec_t * const rec,
+              const char * const source)
 {
   MagickWand *wand = NULL;
   MagickPassFail status = MagickPass;
@@ -83,7 +83,7 @@ imdb_sample(imdb_rec_t * const rec,
 
   if (status == MagickPass) {
     assert(buf_size == BITMAP_SIZE);
-    memset(rec->data, 0x0, IMDB_REC_LEN);
+    memset(rec->data, 0x0, SIMDB_REC_LEN);
     rec->data[REC_OFF_RU] = 0xFF;
     memcpy(&rec->data[REC_OFF_IW], &w, sizeof(uint16_t));
     memcpy(&rec->data[REC_OFF_IH], &h, sizeof(uint16_t));
diff --git a/src/sample.h b/src/sample.h
index 2b5c844..3078b20 100644
--- a/src/sample.h
+++ b/src/sample.h
@@ -2,7 +2,6 @@
 #define HAS_SAMPLER_H 1
 
 int
-imdb_sample(imdb_rec_t * const rec,
-            const char * const source);
+simdb_sample(simdb_rec_t * const rec, const char * const source);
 
 #endif /* HAS_SAMPLER_H */
diff --git a/src/imdb-1to2.c b/src/simdb-1to2.c
similarity index 53%
rename from src/imdb-1to2.c
rename to src/simdb-1to2.c
index 186feaa..166004f 100644
--- a/src/imdb-1to2.c
+++ b/src/simdb-1to2.c
@@ -7,28 +7,28 @@
 #include <sys/types.h>
 #include <unistd.h>
 
-#define IMDB_REC_LEN 48
+#define SIMDB_REC_LEN 48
 #define BLK_SIZE 1000
 
 void usage(const char *message) {
   if (message)
     printf("error: %s\n", message);
-  printf("Usage: imdb_convert_1to2 <infile> <outfile>\n");
+  printf("Usage: simdb_convert_1to2 <infile> <outfile>\n");
   exit(EXIT_FAILURE);
 }
 
 int main(int argc, char **argv) {
   int in, out;
-  long unsigned int imdb_rec_total, rec_first, rec_last, records;
-  unsigned char  in_buf[IMDB_REC_LEN * BLK_SIZE];
-  unsigned char out_buf[IMDB_REC_LEN * BLK_SIZE];
-  unsigned char  header[IMDB_REC_LEN];
+  long unsigned int simdb_rec_total, rec_first, rec_last, records;
+  unsigned char  in_buf[SIMDB_REC_LEN * BLK_SIZE];
+  unsigned char out_buf[SIMDB_REC_LEN * BLK_SIZE];
+  unsigned char  header[SIMDB_REC_LEN];
   unsigned char *src, *dst;
   struct stat st;
   ssize_t bytes;
 
-  memset(header, 0x0, IMDB_REC_LEN);
-  snprintf((char *) header, IMDB_REC_LEN, "IMDB v%02u, CAPS: %s;", 2, "M-R");
+  memset(header, 0x0, SIMDB_REC_LEN);
+  snprintf((char *) header, SIMDB_REC_LEN, "IMDB v%02u, CAPS: %s;", 2, "M-R");
 
   if (argc < 2)
     usage(NULL);
@@ -43,54 +43,54 @@ int main(int argc, char **argv) {
   if (fstat(in, &st) != 0)
     usage(strerror(errno));
 
-  if ((st.st_size % IMDB_REC_LEN) != 0)
+  if ((st.st_size % SIMDB_REC_LEN) != 0)
     usage("database size expected to be multiples to 48");
 
   if (lseek(in, 0, SEEK_SET) < 0)
     usage(strerror(errno));
 
-  if (read(in, in_buf, IMDB_REC_LEN) != IMDB_REC_LEN)
+  if (read(in, in_buf, SIMDB_REC_LEN) != SIMDB_REC_LEN)
     usage("can't read header of database");
 
   if (memcmp(in_buf, "DB of image fingerprints (ver 1)", 32) != 0)
     usage("wrong database header / version mismatch");
 
-  imdb_rec_total = (st.st_size / IMDB_REC_LEN);
-  printf("Processing %lu records\n", imdb_rec_total - 1);
+  simdb_rec_total = (st.st_size / SIMDB_REC_LEN);
+  printf("Processing %lu records\n", simdb_rec_total - 1);
 
-  if (lseek(in, IMDB_REC_LEN, SEEK_SET) < 0)
+  if (lseek(in, SIMDB_REC_LEN, SEEK_SET) < 0)
     usage(strerror(errno));
 
   if (lseek(out, 0, SEEK_SET) < 0)
     usage(strerror(errno));
-  if (write(out, header, IMDB_REC_LEN) != IMDB_REC_LEN)
+  if (write(out, header, SIMDB_REC_LEN) != SIMDB_REC_LEN)
     usage(strerror(errno));
 
-  for (unsigned int block = 0; block <= (imdb_rec_total / BLK_SIZE); block++) {
+  for (unsigned int block = 0; block <= (simdb_rec_total / BLK_SIZE); block++) {
     rec_first = rec_last = (block * BLK_SIZE) + 1;
-    records   = ((rec_first + BLK_SIZE) > imdb_rec_total) ? imdb_rec_total - rec_first : BLK_SIZE;
+    records   = ((rec_first + BLK_SIZE) > simdb_rec_total) ? simdb_rec_total - rec_first : BLK_SIZE;
     rec_last  = rec_first + records;
     printf("* block %u, %4lu records [%lu, %lu]\n",
       block + 1, records, rec_first, rec_last - 1);
-    lseek(in,  rec_first * IMDB_REC_LEN, SEEK_SET);
-    lseek(out, rec_first * IMDB_REC_LEN, SEEK_SET);
-    bytes = read(in, in_buf, IMDB_REC_LEN * records);
-    if (bytes != (ssize_t) records * IMDB_REC_LEN) {
+    lseek(in,  rec_first * SIMDB_REC_LEN, SEEK_SET);
+    lseek(out, rec_first * SIMDB_REC_LEN, SEEK_SET);
+    bytes = read(in, in_buf, SIMDB_REC_LEN * records);
+    if (bytes != (ssize_t) records * SIMDB_REC_LEN) {
       printf("Read size mismatch, expected %lu, got: %zi\n",
-        IMDB_REC_LEN * records, bytes);
+        SIMDB_REC_LEN * records, bytes);
       exit(EXIT_FAILURE);
     }
-    memset(out_buf, 0x0, records * IMDB_REC_LEN);
+    memset(out_buf, 0x0, records * SIMDB_REC_LEN);
     for (unsigned int i = 0; i < records; i++) {
-      src =  &in_buf[i * IMDB_REC_LEN];
-      dst = &out_buf[i * IMDB_REC_LEN];
+      src =  &in_buf[i * SIMDB_REC_LEN];
+      dst = &out_buf[i * SIMDB_REC_LEN];
       memcpy(dst +  0, src + 0, sizeof(char) *  1); // usage flag
       memcpy(dst + 16, src + 2, sizeof(char) *  32); // image bitmap
     }
-    bytes = write(out, out_buf, IMDB_REC_LEN * records);
-    if (bytes != (ssize_t) records * IMDB_REC_LEN) {
+    bytes = write(out, out_buf, SIMDB_REC_LEN * records);
+    if (bytes != (ssize_t) records * SIMDB_REC_LEN) {
       printf("Write size mismatch, expected %lu, got: %zi\n",
-        IMDB_REC_LEN * records, bytes);
+        SIMDB_REC_LEN * records, bytes);
       exit(EXIT_FAILURE); 
     }
   }
diff --git a/src/imdb-query.c b/src/simdb-query.c
similarity index 84%
rename from src/imdb-query.c
rename to src/simdb-query.c
index 946d931..04bd45d 100644
--- a/src/imdb-query.c
+++ b/src/simdb-query.c
@@ -23,7 +23,7 @@
 
 void usage(int exitcode) {
   fprintf(stderr,
-"Usage: imdb-query <opts>\n"
+"Usage: simdb-query <opts>\n"
 "  -b <path>   Path to database\n"
 "  -t <int>    Maximum difference pct (0 - 50, default: 10%%)\n"
 );
@@ -40,21 +40,21 @@ void usage(int exitcode) {
   exit(exitcode);
 }
 
-int search_similar(imdb_db_t *db, uint64_t number, float maxdiff)
+int search_similar(simdb_t *db, uint64_t number, float maxdiff)
 {
   int ret = 0, i = 0;
-  imdb_rec_t sample;
-  imdb_match_t *matches = NULL;
-  imdb_search_t search;
+  simdb_rec_t sample;
+  simdb_match_t *matches = NULL;
+  simdb_search_t search;
 
-  memset(&sample, 0x0, sizeof(imdb_rec_t));
-  memset(&search, 0x0, sizeof(imdb_search_t));
+  memset(&sample, 0x0, sizeof(simdb_rec_t));
+  memset(&search, 0x0, sizeof(simdb_search_t));
   search.maxdiff_ratio  = 0.2; /* 20% */
   search.maxdiff_bitmap = maxdiff;
 
   sample.num = number;
-  if ((ret = imdb_search(db, &sample, &search, &matches)) < 0) {
-    fprintf(stderr, "%s\n", imdb_error(ret));
+  if ((ret = simdb_search(db, &sample, &search, &matches)) < 0) {
+    fprintf(stderr, "%s\n", simdb_error(ret));
     return 1;
   }
 
@@ -70,7 +70,7 @@ int search_similar(imdb_db_t *db, uint64_t number, float maxdiff)
   return 0;
 }
 
-int db_usage_map(imdb_db_t *db, unsigned short int cols)
+int db_usage_map(simdb_t *db, unsigned short int cols)
 {
   char *map = NULL;
   char *m   = NULL;
@@ -80,7 +80,7 @@ int db_usage_map(imdb_db_t *db, unsigned short int cols)
 
   memset(row, 0x0, sizeof(char) * 256);
 
-  if ((records = imdb_usage_map(db, &map)) == 0) {
+  if ((records = simdb_usage_map(db, &map)) == 0) {
     fprintf(stderr, "database usage: can't get database map\n");
     FREE(map);
     return 1;
@@ -107,26 +107,26 @@ int db_usage_map(imdb_db_t *db, unsigned short int cols)
   return 0;
 }
 
-int db_usage_slice(imdb_db_t *db, uint64_t offset, uint16_t limit)
+int db_usage_slice(simdb_t *db, uint64_t offset, uint16_t limit)
 {
   char *map = NULL;
 
-  limit = imdb_usage_slice(db, &map, offset, limit);
+  limit = simdb_usage_slice(db, &map, offset, limit);
   puts(map);
   FREE(map);
 
   return 0;
 }
 
-int rec_bitmap(imdb_db_t *db, uint64_t number)
+int rec_bitmap(simdb_t *db, uint64_t number)
 {
-  imdb_rec_t rec;
+  simdb_rec_t rec;
 
   assert(db != NULL);
-  memset(&rec, 0x0, sizeof(imdb_rec_t));
+  memset(&rec, 0x0, sizeof(simdb_rec_t));
 
   rec.num = number;
-  if (imdb_read_rec(db, &rec) < 1) {
+  if (simdb_read_rec(db, &rec) < 1) {
     fprintf(stderr, "bitmap: %s\n", "sample not found");
     return 1;
   }
@@ -136,26 +136,26 @@ int rec_bitmap(imdb_db_t *db, uint64_t number)
   return 0;
 }
 
-int rec_diff(imdb_db_t *db, uint64_t a, uint64_t b, unsigned short int showmap)
+int rec_diff(simdb_t *db, uint64_t a, uint64_t b, unsigned short int showmap)
 {
-  imdb_rec_t rec;
+  simdb_rec_t rec;
   float diff = 0.0;
   unsigned char one[BITMAP_SIZE];
   unsigned char two[BITMAP_SIZE];
   unsigned char map[BITMAP_SIZE];
 
   assert(db != NULL);
-  memset(&rec, 0x0, sizeof(imdb_rec_t));
+  memset(&rec, 0x0, sizeof(simdb_rec_t));
 
   rec.num = a;
-  if (imdb_read_rec(db, &rec) < 1) {
+  if (simdb_read_rec(db, &rec) < 1) {
     fprintf(stderr, "record diff: first sample not exists\n");
     return 1;
   }
   memcpy(one, &rec.data[REC_OFF_BM], BITMAP_SIZE);
 
   rec.num = b;
-  if (imdb_read_rec(db, &rec) < 1) {
+  if (simdb_read_rec(db, &rec) < 1) {
     fprintf(stderr, "record diff: second sample not exists\n");
     return 1;
   }
@@ -179,7 +179,7 @@ int main(int argc, char **argv)
   const char *db_path = NULL;
   float maxdiff = 0.10;
   unsigned short int cols = 64, map = 0, ret = 0;
-  imdb_db_t *db = NULL;
+  simdb_t *db = NULL;
   uint64_t a = 0, b = 0;
   char *c = NULL;
   int err;
@@ -242,7 +242,7 @@ int main(int argc, char **argv)
     exit(EXIT_FAILURE);
   }
 
-  if ((db = imdb_open(db_path, 0, &err)) == NULL) {
+  if ((db = simdb_open(db_path, 0, &err)) == NULL) {
     fprintf(stderr, "database open: %d\n", err);
     exit(EXIT_FAILURE);
   }
@@ -280,7 +280,7 @@ int main(int argc, char **argv)
       break;
   }
 
-  imdb_close(db);
+  simdb_close(db);
 
   return ret;
 }
diff --git a/src/imdb-write.c b/src/simdb-write.c
similarity index 80%
rename from src/imdb-write.c
rename to src/simdb-write.c
index 99c03b5..16aca38 100644
--- a/src/imdb-write.c
+++ b/src/simdb-write.c
@@ -7,7 +7,7 @@
 
 void usage(int exitcode) {
   fprintf(stderr,
-"Usage: imdb-write <opts>\n"
+"Usage: simdb-write <opts>\n"
 "  -b <path>   Path to database\n"
 );
   fprintf(stderr,
@@ -25,11 +25,11 @@ int main(int argc, char **argv)
   const char *db_path = NULL;
   const char *sample = NULL;
   const char *c = NULL;
-  imdb_db_t  *db = NULL;
-  imdb_rec_t rec;
+  simdb_t  *db = NULL;
+  simdb_rec_t rec;
   int err;
 
-  memset(&rec, 0x0, sizeof(imdb_rec_t));
+  memset(&rec, 0x0, sizeof(simdb_rec_t));
 
   if (argc < 3)
     usage(EXIT_FAILURE);
@@ -68,12 +68,12 @@ int main(int argc, char **argv)
   }
 
   if (mode == init) {
-    if (!imdb_create(db_path)) {
+    if (!simdb_create(db_path)) {
       fprintf(stderr, "database init: %s\n", strerror(errno));
       exit(EXIT_FAILURE);
     }
   }
-  if ((db = imdb_open(db_path, 1, &err)) == NULL) {
+  if ((db = simdb_open(db_path, 1, &err)) == NULL) {
     fprintf(stderr, "can't open database: %d\n", err);
     exit(EXIT_FAILURE);
   }
@@ -82,18 +82,18 @@ int main(int argc, char **argv)
     case add :
       if (rec.num == 0 || sample == NULL)
         usage(EXIT_FAILURE);
-      if (imdb_sample(&rec, sample) != 0) {
+      if (simdb_sample(&rec, sample) != 0) {
         fprintf(stderr, "sampler failure\n");
         exit(EXIT_FAILURE);
       }
-      if ((err = imdb_write_rec(db, &rec)) < 1) {
-        fprintf(stderr, "%s\n", imdb_error(err));
+      if ((err = simdb_write_rec(db, &rec)) < 1) {
+        fprintf(stderr, "%s\n", simdb_error(err));
         exit(EXIT_FAILURE);
       }
       break;
     case del :
-      if ((err = imdb_write_rec(db, &rec)) < 1) {
-        fprintf(stderr, "%s\n", imdb_error(err));
+      if ((err = simdb_write_rec(db, &rec)) < 1) {
+        fprintf(stderr, "%s\n", simdb_error(err));
         exit(EXIT_FAILURE);
       }
       break;
@@ -104,7 +104,7 @@ int main(int argc, char **argv)
       usage(EXIT_FAILURE);
       break;
   }
-  imdb_close(db);
+  simdb_close(db);
 
   exit(EXIT_SUCCESS);
 }
diff --git a/tests/database.c b/tests/database.c
index 62d65a9..5c711a6 100644
--- a/tests/database.c
+++ b/tests/database.c
@@ -1,53 +1,52 @@
 #include "../src/common.h"
 #include "../src/database.h"
 
-int main()
-{
-  imdb_db_t *db;
-  imdb_rec_t rec[2];
-  imdb_block_t blk;
+int main() {
+  simdb_t *db;
+  simdb_rec_t rec[2];
+  simdb_block_t blk;
   char *path = "test.db";
   int mode = 0, err = 0, num;
   bool ret;
 
   unlink(path);
 
-  db = imdb_open(path, mode, &err);
+  db = simdb_open(path, mode, &err);
   assert(db == NULL);
   assert(err == -1); /* no such file */
 
-  ret = imdb_create(path);
+  ret = simdb_create(path);
   assert(ret == true);
 
-  db = imdb_open(path, mode, &err);
+  db = simdb_open(path, mode, &err);
   assert(db != NULL);
 
   rec[0].num = 1;
-  err = imdb_read_rec(db, rec);
-  assert(err == IMDB_ERR_NXRECORD);
+  err = simdb_read_rec(db, rec);
+  assert(err == SIMDB_ERR_NXRECORD);
 
-  memset(rec[0].data, 0xAA, IMDB_REC_LEN);
+  memset(rec[0].data, 0xAA, SIMDB_REC_LEN);
   memset(rec[0].data, 0xFF, 1); /* record is used */
 
-  num = imdb_write_rec(db, rec);
-  assert(num == IMDB_ERR_READONLY); /* database open in read-only mode */
+  num = simdb_write_rec(db, rec);
+  assert(num == SIMDB_ERR_READONLY); /* database open in read-only mode */
 
-  imdb_close(db);
+  simdb_close(db);
 
-  mode |= IMDB_FLAG_WRITE;
-  db = imdb_open(path, mode, &err);
+  mode |= SIMDB_FLAG_WRITE;
+  db = simdb_open(path, mode, &err);
   assert(db != NULL);
 
-  num = imdb_write_rec(db, rec);
+  num = simdb_write_rec(db, rec);
   assert(num == 1); /* success */
 
-  num = imdb_read_rec(db, rec);
+  num = simdb_read_rec(db, rec);
   assert(num == 1);
 
   blk.start   = 1;
   blk.records = 2;
   blk.data    = NULL;
-  num = imdb_read_blk(db, &blk);
+  num = simdb_read_blk(db, &blk);
   assert(num == 1);
   assert(blk.records == 1);
   assert(blk.data != NULL);
@@ -55,7 +54,7 @@ int main()
   rec[0].num = 1;
   rec[1].num = 3;
 
-  imdb_close(db);
+  simdb_close(db);
 
   return 0;
 }