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   * [browserstack.com](https://www.browserstack.com/) — Manual and automated browser testing, free for Open Source
   * [everystep-automation.com](https://www.everystep-automation.com/) — Records and replays all steps made in a web browser and creates scripts,... free with fewer options
   * [Applitools.com](https://applitools.com/) — smart visual validation for web, native mobile and desktop apps. Integrates with almost all automation solutions (like Selenium and Karma) and remote runners (Sauce Labs, Browser Stack). free for open source. A free tier for a single user with limited checkpoints per week.
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+  * [checkbot.io](https://www.checkbot.io/) — Browser extension that tests if your website follows 50+ SEO, speed and security best practices. Free tier for smaller websites.
+  
 ## Security and PKI
 
   * [pyup.io](https://pyup.io) — Monitory Python dependencies for security vulnerabilities and update them automatically. Free for one private project, unlimited projects for open source.