diff --git a/README.md b/README.md
index b99cc2c..0ff2bd4 100644
--- a/README.md
+++ b/README.md
@@ -137,6 +137,7 @@ A curated list of Web Performance Optimization. Everyone can contribute here!
 - [Web Bloat Score Calculator](http://www.webbloatscore.com/) - Compare size of a page to a compressed image of the same page
 - [Speed Racer](https://github.com/ngryman/speedracer) - Collect performance metrics for your library/application using Chrome headless.
 - [Speedrank](https://speedrank.app/) - Speedrank monitors the performance of your site in the background. It displays Lighthouse reports over time and delivers recommendations for improvement. Speedrank is a paid product with 14-day-trial.
+- [Lightest App](https://lightest.app/) - Webpage load time is extremely important for conversion and revenue. Visualize web performance against competitors.
 
 ## Analyzers - API
 
diff --git a/content/README.md b/content/README.md
index f60c86c..0018c47 100644
--- a/content/README.md
+++ b/content/README.md
@@ -65,6 +65,7 @@ A curated list of Web Performance Optimization. Everyone can contribute here!
 - [Varvy](https://varvy.com/pagespeed/) - Test your site to see if it follows the Google guidelines for speed.
 - [Web Bloat Score Calculator](http://www.webbloatscore.com/) - Compare size of a page to a compressed image of the same page
 - [Speed Racer](https://github.com/ngryman/speedracer) - Collect performance metrics for your library/application using Chrome headless.
+- [Lightest App](https://lightest.app/) - Webpage load time is extremely important for conversion and revenue. Visualize web performance against competitors.
 
 ## Analyzers - API