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LT Browser vs Am I Responsive: catalog facts
LT Browser	Am I Responsive
Freemium Free to download, with paid tiers as part of the TestMu AI platform.	Free Free to use.
Windows, macOS, Linux	Web
Views several device viewports side by side More than 50 device screen presets	Four device views in one presentable image Works with localhost URLs
Device views are emulated rather than real hardware Tied to a commercial testing platform with paid tiers	Not a testing tool, by the author's own description Fixed viewports modelled only on Apple devices
Downloadable app	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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