Compare software

BrowserStack ResponsiveLT Browser
Freemium

The responsive checker is free; BrowserStack's wider testing products are paid.

 Freemium

Free to download, with paid tiers as part of the TestMu AI platform.

Web Windows, macOS, Linux
  • Previews pages on real devices rather than resized frames
  • Covers many screen sizes and resolutions at once
  • Views several device viewports side by side
  • More than 50 device screen presets
  • Deeper testing features sit behind BrowserStack's paid plans
  • Only tests publicly reachable pages
  • Device views are emulated rather than real hardware
  • Tied to a commercial testing platform with paid tiers
Web application Downloadable app
Closed source Closed source
License not stated License not stated
Not stated if an account is needed Not stated if an account is needed
Needs internet Not stated if it works offline

Checked September 23, 2026

Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.