diff --git a/pkgs/by-name/si/similarity/package.nix b/pkgs/by-name/si/similarity/package.nix
new file mode 100644
index 000000000000..c10e5dfc9279
--- /dev/null
+++ b/pkgs/by-name/si/similarity/package.nix
@@ -0,0 +1,36 @@
+{
+  lib,
+  rustPlatform,
+  fetchFromGitHub,
+  versionCheckHook,
+  nix-update-script,
+}:
+
+rustPlatform.buildRustPackage (finalAttrs: {
+  pname = "similarity";
+  version = "0.2.4";
+
+  src = fetchFromGitHub {
+    owner = "mizchi";
+    repo = "similarity";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-Z2ZaKBpq7N8KIX8nOzPhm8evfoUxBzaAK0+4cU9qBDE=";
+  };
+
+  cargoHash = "sha256-oYqdCHGY6OZSbYXhjIt20ZL2JkZP7UEOhn0fhuZQnZo=";
+
+  nativeInstallCheckInputs = [ versionCheckHook ];
+  versionCheckProgram = "${placeholder "out"}/bin/${finalAttrs.pname}-ts";
+  versionCheckProgramArg = "--version";
+  doInstallCheck = true;
+
+  passthru.updateScript = nix-update-script { };
+
+  meta = {
+    description = "Code similarity detection tool";
+    homepage = "https://github.com/mizchi/similarity";
+    changelog = "https://github.com/mizchi/similarity/blob/v${finalAttrs.version}/CHANGELOG.md";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ airrnot ];
+  };
+})