diff --git a/replace/google-recaptcha.md b/replace/google-recaptcha.md
index ab33ecd9716577ac69b8d9561ce2148f51489e43..d21df83d099f440cba453ca4ef23b151525ed616 100644
--- a/replace/google-recaptcha.md
+++ b/replace/google-recaptcha.md
@@ -15,3 +15,13 @@ Securimage is an open-source free PHP CAPTCHA script for generating complex imag
   - **Source code**: [GitHub](https://github.com/dapphp/securimage)
   - **License**: [BSD 2-Clause "Simplified"](https://github.com/dapphp/securimage/blob/master/LICENSE.txt)
 {% endinfobox %}
+
+## FriendlyCaptcha
+
+FriendlyCaptcha is a proof-of-work based CAPTCHA in which the user's device does all the work.
+
+{% infobox %}
+ - **Website**: friendlycaptcha.com
+ - **Source code**: [GitHub](https://github.com/gzuidhof/friendly-challenge)
+ - **License**: *None*
+{% endinfobox %}