diff --git a/more/free-programming-playgrounds.md b/more/free-programming-playgrounds.md
index 0ae0edea1f4a485f984af23bb4b1a84ffe45a44f..e86120216078904588dae9264c58dc602ec93d46 100644
--- a/more/free-programming-playgrounds.md
+++ b/more/free-programming-playgrounds.md
@@ -52,6 +52,8 @@
 
 ### <a name="cpp"></a>C++
 
+* [LabStack](https://code.labstack.com/cpp)
+* [OnlineGDB](https://www.onlinegdb.com/online_c++_compiler)
 * [SoloLearn](https://code.sololearn.com/cpp)