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LT Browser vs Responsively App: catalog facts
LT Browser	Responsively App
Freemium Free to download, with paid tiers as part of the TestMu AI platform.	Free The open-source application is available without a license fee.
Windows, macOS, Linux	Windows, macOS, Linux
Views several device viewports side by side More than 50 device screen presets	Interactions mirror across every viewport at once Screenshots every device size in a single action
Device views are emulated rather than real hardware Tied to a commercial testing platform with paid tiers	Electron application with a large memory footprint Rendering is Chromium only, so it says nothing about Firefox or Safari
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: AGPL-3.0
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 22, 2026

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