diff --git a/cpp/Platform.Interfaces.Tests/Platform.Interfaces.Tests.cpp b/cpp/Platform.Interfaces.Tests/Platform.Interfaces.Tests.cpp
index e94e7fd3..745edc68 100644
--- a/cpp/Platform.Interfaces.Tests/Platform.Interfaces.Tests.cpp
+++ b/cpp/Platform.Interfaces.Tests/Platform.Interfaces.Tests.cpp
@@ -2,6 +2,57 @@
 #include <gtest/gtest.h>
 
 namespace Platform::Interfaces::Tests {
+  namespace {
+    struct ReadonlyListModel {
+      int items[1]{};
+
+      const int* begin() const { return items; }
+      const int* end() const { return items + 1; }
+      const int& operator[](std::size_t index) const { return items[index]; }
+      std::size_t size() const { return static_cast<std::size_t>(end() - begin()); }
+      bool empty() const { return begin() == end(); }
+    };
+
+    struct ReadonlySetModel {
+      int items[1]{};
+
+      const int* begin() const { return items; }
+      const int* end() const { return items + 1; }
+      const int* find(int item) const { return items[0] == item ? begin() : end(); }
+      bool contains(int item) const { return find(item) != end(); }
+      std::size_t size() const { return static_cast<std::size_t>(end() - begin()); }
+      bool empty() const { return begin() == end(); }
+    };
+
+    struct ReadonlyDictionaryModel {
+      std::tuple<int, int> items[1]{};
+
+      const std::tuple<int, int>* begin() const { return items; }
+      const std::tuple<int, int>* end() const { return items + 1; }
+      const std::tuple<int, int>* find(int key) const { return std::get<0>(items[0]) == key ? begin() : end(); }
+      bool contains(int key) const { return find(key) != end(); }
+      std::size_t size() const { return static_cast<std::size_t>(end() - begin()); }
+      bool empty() const { return begin() == end(); }
+    };
+  }  // namespace
+
+  static_assert(CReadonlyList<const ReadonlyListModel>);
+  static_assert(CReadonlyList<const ReadonlyListModel, int>);
+  static_assert(!CList<const ReadonlyListModel>);
+  static_assert(std::same_as<typename ReadonlyList<const ReadonlyListModel>::Item, int>);
+
+  static_assert(CReadonlySet<const ReadonlySetModel>);
+  static_assert(CReadonlySet<const ReadonlySetModel, int>);
+  static_assert(!CSet<const ReadonlySetModel>);
+  static_assert(std::same_as<typename ReadonlySet<const ReadonlySetModel>::Item, int>);
+
+  static_assert(CReadonlyDictionary<const ReadonlyDictionaryModel>);
+  static_assert(CReadonlyDictionary<const ReadonlyDictionaryModel, int>);
+  static_assert(CReadonlyDictionary<const ReadonlyDictionaryModel, int, int>);
+  static_assert(!CDictionary<const ReadonlyDictionaryModel>);
+  static_assert(std::same_as<std::remove_reference_t<typename ReadonlyDictionary<const ReadonlyDictionaryModel>::Key>, int>);
+  static_assert(std::same_as<std::remove_reference_t<typename ReadonlyDictionary<const ReadonlyDictionaryModel>::Value>, int>);
+
   TEST(CompileTests, Counter) {
     struct EmptyCounter1 : ICounter<int> {
       int Count() { return {}; }
diff --git a/cpp/Platform.Interfaces/CDictionary.h b/cpp/Platform.Interfaces/CDictionary.h
index ba2857b3..25f8cffa 100644
--- a/cpp/Platform.Interfaces/CDictionary.h
+++ b/cpp/Platform.Interfaces/CDictionary.h
@@ -64,15 +64,67 @@ namespace Platform::Interfaces {
 
       return false;
     }
+
+    template <typename TRawSelf, typename... TArgs>
+    consteval bool CReadonlyDictionaryHelpFunction() {
+      using Self = TRawSelf;
+
+      using GenericKey = std::remove_reference_t<decltype(std::get<0>(std::declval<typename Enumerable<Self>::Item>()))>;
+
+      if constexpr (sizeof...(TArgs) == 0) {
+        return requires(const Self& self, GenericKey generic_key) {
+          { self.find(generic_key) } -> std::forward_iterator;
+          { self.contains(generic_key) } -> std::same_as<bool>;
+          { self.empty() } -> std::same_as<bool>;
+          { self.size() } -> std::integral;
+
+          requires std::ranges::forward_range<const Self>;
+        };
+      }
+      if constexpr (sizeof...(TArgs) == 1) {
+        return requires(const Self& self, std::tuple<TArgs...> args,
+                        decltype(std::get<0>(args)) key) {
+          { self.find(key) } -> std::forward_iterator;
+          { self.contains(key) } -> std::same_as<bool>;
+          { self.empty() } -> std::same_as<bool>;
+          { self.size() } -> std::integral;
+
+          requires std::ranges::forward_range<const Self>;
+        };
+      }
+      if constexpr (sizeof...(TArgs) == 2) {
+        return requires(const Self& self, std::tuple<TArgs...> args,
+                        decltype(std::get<0>(args)) key) {
+          { self.find(key) } -> std::forward_iterator;
+          { self.contains(key) } -> std::same_as<bool>;
+          { self.empty() } -> std::same_as<bool>;
+          { self.size() } -> std::integral;
+
+          requires std::ranges::forward_range<const Self>;
+        };
+      }
+
+      return false;
+    }
   }  // namespace Internal
 
   template <typename TSelf, typename... TArgs>
   concept CDictionary = CEnumerable<TSelf> && Internal::CDictionaryHelpFunction<TSelf, TArgs...>();
 
+  template <typename TSelf, typename... TArgs>
+  concept CReadonlyDictionary = CEnumerable<TSelf> && Internal::CReadonlyDictionaryHelpFunction<TSelf, TArgs...>();
+
   template <CDictionary TSelf>
   struct Dictionary : Enumerable<TSelf> {
     using base = Enumerable<TSelf>;
-    using Key = decltype(std::get<0>(std::declval<base::Item>()));
-    using Value = decltype(std::get<1>(std::declval<base::Item>()));
+    using Key = decltype(std::get<0>(std::declval<typename base::Item>()));
+    using Value = decltype(std::get<1>(std::declval<typename base::Item>()));
+  };
+
+  template <CReadonlyDictionary TSelf>
+  struct ReadonlyDictionary : Enumerable<TSelf> {
+    using base = Enumerable<TSelf>;
+    using Key = decltype(std::get<0>(std::declval<typename base::Item>()));
+    using Value = decltype(std::get<1>(std::declval<typename base::Item>()));
   };
 }  // namespace Platform::Interfaces
diff --git a/cpp/Platform.Interfaces/CList.h b/cpp/Platform.Interfaces/CList.h
index a4ab17ac..b1dfb6c2 100644
--- a/cpp/Platform.Interfaces/CList.h
+++ b/cpp/Platform.Interfaces/CList.h
@@ -36,11 +36,47 @@ namespace Platform::Interfaces {
 
       return false;
     }
+
+    template <typename TRawSelf, typename... TItems>
+    consteval bool CReadonlyListHelpFunction() {
+      using Self = TRawSelf;
+
+      if constexpr (sizeof...(TItems) == 1) {
+        using RequiredItem = std::remove_reference_t<decltype(std::get<0>(std::declval<std::tuple<TItems...>>()))>;
+
+        return requires(const Self& self, std::size_t index) {
+          { self.size() } -> std::integral;
+          { self.empty() } -> std::same_as<bool>;
+          { self[index] } -> std::convertible_to<RequiredItem>;
+
+          requires std::ranges::forward_range<const Self>;
+        };
+      }
+      if constexpr (sizeof...(TItems) == 0) {
+        using GenericItem = typename Enumerable<const Self>::Item;
+
+        return requires(const Self& self, std::size_t index) {
+          { self.size() } -> std::integral;
+          { self.empty() } -> std::same_as<bool>;
+          { self[index] } -> std::convertible_to<GenericItem>;
+
+          requires std::ranges::forward_range<const Self>;
+        };
+      }
+
+      return false;
+    }
   }  // namespace Internal
 
   template <typename TSelf, typename... TItems>
   concept CList = CArray<TSelf> && Internal::CListHelpFunction<TSelf, TItems...>();
 
+  template <typename TSelf, typename... TItems>
+  concept CReadonlyList = CArray<TSelf> && Internal::CReadonlyListHelpFunction<TSelf, TItems...>();
+
   template <CList TSelf>
   struct List : Enumerable<TSelf> {};
+
+  template <CReadonlyList TSelf>
+  struct ReadonlyList : Enumerable<TSelf> {};
 }  // namespace Platform::Interfaces
diff --git a/cpp/Platform.Interfaces/CSet.h b/cpp/Platform.Interfaces/CSet.h
index 7f9bceb8..b61e4365 100644
--- a/cpp/Platform.Interfaces/CSet.h
+++ b/cpp/Platform.Interfaces/CSet.h
@@ -43,11 +43,45 @@ namespace Platform::Interfaces {
       return false;
     }
 
+    template <typename TRawSelf, typename... TItems>
+    consteval bool CReadonlySetHelpFunction() {
+      using Self = TRawSelf;
+
+      if constexpr (sizeof...(TItems) == 1) {
+        return requires(const Self& self, std::tuple<TItems...> items, decltype(std::get<0>(items)) item) {
+          { self.find(item) } -> std::same_as<std::ranges::iterator_t<const Self>>;
+          { self.contains(item) } -> std::same_as<bool>;
+          { self.empty() } -> std::same_as<bool>;
+          { self.size() } -> std::integral;
+
+          requires std::ranges::forward_range<const Self>;
+        };
+      }
+      if constexpr (sizeof...(TItems) == 0) {
+        return requires(const Self& self, typename Enumerable<const Self>::Item generic_item) {
+          { self.find(generic_item) } -> std::same_as<std::ranges::iterator_t<const Self>>;
+          { self.contains(generic_item) } -> std::same_as<bool>;
+          { self.empty() } -> std::same_as<bool>;
+          { self.size() } -> std::integral;
+
+          requires std::ranges::forward_range<const Self>;
+        };
+      }
+
+      return false;
+    }
+
   }  // namespace Internal
 
   template <typename TSelf, typename... TItems>
   concept CSet = CEnumerable<TSelf> && Internal::CSetHelpFunction<TSelf, TItems...>();
 
+  template <typename TSelf, typename... TItems>
+  concept CReadonlySet = CEnumerable<TSelf> && Internal::CReadonlySetHelpFunction<TSelf, TItems...>();
+
   template <CSet TSelf>
   struct Set : Enumerable<TSelf> {};
+
+  template <CReadonlySet TSelf>
+  struct ReadonlySet : Enumerable<TSelf> {};
 }  // namespace Platform::Interfaces
diff --git a/cpp/Platform.Interfaces/Platform.Interfaces.TemplateLibrary.nuspec b/cpp/Platform.Interfaces/Platform.Interfaces.TemplateLibrary.nuspec
index ac432092..ac877563 100644
--- a/cpp/Platform.Interfaces/Platform.Interfaces.TemplateLibrary.nuspec
+++ b/cpp/Platform.Interfaces/Platform.Interfaces.TemplateLibrary.nuspec
@@ -6,7 +6,7 @@
     <summary>LinksPlatform's Platform.Interfaces is a Template Library what contains common concepts templates.</summary>
     <description>LinksPlatform's Platform.Interfaces is a Template Library what contains set of C++ concepts templates. Use Platform.Interfaces.h file to include the library.</description>
     <releaseNotes>Test release for automatic deploy system.</releaseNotes>
-    <version>0.3.42</version>
+    <version>0.3.43</version>
     <authors>konard, uselessgoddess, Mitron57</authors>
     <owners>konard, uselessgoddess, Mitron57</owners>
     <copyright>konard, uselessgoddess, Mitron57</copyright>