diff --git a/include/compattable.h b/include/compattable.h
new file mode 100644
index 0000000..048828e
--- /dev/null
+++ b/include/compattable.h
@@ -0,0 +1,109 @@
+#pragma once
+#include "actions.h"
+#include "data.h"
+#include <array>
+
+template<class A, class D> struct CompatTableS;
+
+template<template<class...> class A, template<class...> class D, class... Acts, class... Datas> struct CompatTableS<A<Acts...>, D<Datas...>>
+{
+ size_t static consteval StrLen(const char* str) { return *str ? 1 + StrLen(str + 1) : 0; }
+
+ template<class D1, class... Dd> static consteval size_t MaxNameLen()
+ {
+  if constexpr(sizeof...(Dd) == 0)
+   return StrLen(D1::name);
+  else
+   return std::max(StrLen(D1::name), MaxNameLen<Dd...>());
+ }
+
+ static constexpr size_t W = MaxNameLen<Datas...>();
+
+ template<size_t N> static consteval auto C2A(const char (&s)[N])
+ {
+  std::array<char, N> out;
+  for(size_t i = 0; i < N; i++) out[i] = s[i];
+  return out;
+ }
+
+ static constexpr auto em = C2A("");
+ static constexpr auto sp = C2A(" ");
+ static constexpr auto nd = C2A("\n");
+
+ template<class T> static consteval auto N2A()
+ {
+  std::array<char, StrLen(T::name) + 1> out;
+  for(size_t i = 0; i <= StrLen(T::name); i++) out[i] = T::name[i];
+  return out;
+ }
+ template<class T> static constexpr auto name = N2A<T>();
+
+ template<size_t N, size_t M, class... T> static consteval auto Merge(const std::array<char, N>& arg1, const std::array<char, M>& arg2, const T&... args)
+ {
+  if constexpr(sizeof...(T) == 0)
+  {
+   std::array<char, N + M - 1> out;
+   for(size_t i = 0; i < N - 1; i++) out[i] = arg1[i];
+   for(size_t i = 0; i < M; i++) out[i + N - 1] = arg2[i];
+   return out;
+  }
+  else
+   return Merge(arg1, Merge(arg2, args...));
+ }
+
+ template<size_t n> static consteval auto Spaces()
+ {
+  if constexpr(n == 0)
+   return em;
+  else
+   return Merge(sp, Spaces<n - 1>());
+ }
+
+ template<size_t n, class T> static consteval auto AlignR(const T& s)
+ {
+  constexpr size_t len = std::tuple_size_v<T> - 1;
+  if constexpr(len > n) return s;
+  return Merge(Spaces<n - len>(), s);
+ }
+
+ template<size_t n, class T> static consteval auto AlignL(const T& s)
+ {
+  constexpr size_t len = std::tuple_size_v<T> - 1;
+  if constexpr(len > n) return s;
+  return Merge(s, Spaces<n - len>());
+ }
+
+ template<class A1, class... Aa> static consteval auto MergeNames()
+ {
+  if constexpr(sizeof...(Aa) == 0)
+   return name<A1>;
+  else
+   return Merge(name<A1>, sp, MergeNames<Aa...>());
+ }
+
+ static constexpr auto header = Merge(Spaces<W>(), MergeNames<Acts...>());
+
+ template<class Dat, class A1, class... Aa> static consteval auto MergeSup()
+ {
+  constexpr bool issup = A1::template IsSupported<Dat> && !IsDisabled<A1, Dat>();
+  constexpr auto v     = Merge(Spaces<StrLen(A1::name) - 1>(), C2A(issup ? "\033[32mY\033[0m" : "\033[31mN\033[0m"));
+  //constexpr auto v     = AlignR<StrLen(A1::name)>(C2A(issup ? "X" : " "));
+  if constexpr(sizeof...(Aa) == 0)
+   return v;
+  else
+   return Merge(v, sp, MergeSup<Dat, Aa...>());
+ }
+
+ template<class D1, class... Dd> static consteval auto MergeRows()
+ {
+  constexpr auto r = Merge(AlignL<W>(name<D1>), MergeSup<D1, Acts...>());
+  if constexpr(sizeof...(Dd) == 0)
+   return r;
+  else
+   return Merge(r, nd, MergeRows<Dd...>());
+ }
+
+ static constexpr auto value = Merge(header, nd, MergeRows<Datas...>());
+};
+
+static constexpr auto CompatTable = CompatTableS<ActionVariants, DataVariants>::value.data();
diff --git a/include/odm.h b/include/odm.h
index 7b798dd..06db38c 100644
--- a/include/odm.h
+++ b/include/odm.h
@@ -1,6 +1,5 @@
 #pragma once
-#include "actions.h"
-#include "data.h"
+#include "compattable.h"
 
 using michlib::errmessage;
 using michlib::message;
diff --git a/src/odm.cpp b/src/odm.cpp
index e2756ce..4cfbaf1 100644
--- a/src/odm.cpp
+++ b/src/odm.cpp
@@ -61,6 +61,12 @@ int main(int argc, char** argv)
   Usage(argv[0]);
   return 2;
  }
+ if(argc == 2 && (argv[1] == MString("table") || argv[1] == MString("compattable")))
+ {
+  message(CompatTable);
+  return 2;
+ }
+
  auto args = ParseArgs(argc, argv);
 
  MString action = args.contains("action") ? args["action"] : "info";