diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4beef06..66040d0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -164,6 +164,7 @@ set(INCLUDE
         include/tcframe/util.hpp
         include/tcframe/util/StringUtils.hpp
         include/tcframe/util/optional.hpp
+        include/tcframe/validator/number.hpp
         include/tcframe/validator/vector.hpp
 )
 
@@ -259,6 +260,7 @@ set(TEST_UNIT
         test/unit/tcframe/util/OptionalTests.cpp
         test/unit/tcframe/util/StringUtilsTests.cpp
         test/unit/tcframe/util/TestUtils.hpp
+        test/unit/tcframe/validator/NumberValidatorTests.cpp
         test/unit/tcframe/validator/VectorValidatorTests.cpp
 )
 
diff --git a/include/tcframe/validator/number.hpp b/include/tcframe/validator/number.hpp
new file mode 100644
index 0000000..f26f7fa
--- /dev/null
+++ b/include/tcframe/validator/number.hpp
@@ -0,0 +1,8 @@
+namespace tcframe {
+
+template<typename T>
+bool isBetween(T N, T mn, T mx) {
+    return N >= mn && N <= mx;
+}
+
+}
diff --git a/test/unit/tcframe/validator/NumberValidatorTests.cpp b/test/unit/tcframe/validator/NumberValidatorTests.cpp
new file mode 100644
index 0000000..9d9bc91
--- /dev/null
+++ b/test/unit/tcframe/validator/NumberValidatorTests.cpp
@@ -0,0 +1,21 @@
+#include "gmock/gmock.h"
+
+#include "tcframe/validator/number.hpp"
+
+using ::testing::Eq;
+using ::testing::Test;
+
+namespace tcframe {
+
+class NumberValidatorTests : public Test {};
+
+TEST_F(NumberValidatorTests, isBetween) {
+    EXPECT_FALSE(isBetween(5, 1, 4));
+    EXPECT_FALSE(isBetween(5, 6, 10));
+    EXPECT_FALSE(isBetween(5, 100, -100));
+    EXPECT_TRUE(isBetween(5, 1, 5));
+    EXPECT_TRUE(isBetween(5, 5, 10));
+    EXPECT_TRUE(isBetween(5, 0, 10));
+}
+
+}