Airtap vs Selenium: What are the differences?
Airtap: Test your JavaScript in 800+ browsers. Airtap tests your JavaScript in browsers using a TAP-producing harness; Selenium: Web Browser Automation. Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that. Boring web-based administration tasks can (and should!) also be automated as well.
Airtap and Selenium can be categorized as "Browser Testing" tools.
Airtap and Selenium are both open source tools. Selenium with 14.9K GitHub stars and 4.97K forks on GitHub appears to be more popular than Airtap with 1.33K GitHub stars and 50 GitHub forks.