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Responsively App vs LT Browser: catalog facts
Responsively App	LT Browser
Free The open-source application is available without a license fee.	Freemium Free to download, with paid tiers as part of the TestMu AI platform.
Windows, macOS, Linux	Windows, macOS, Linux
Interactions mirror across every viewport at once Screenshots every device size in a single action	Views several device viewports side by side More than 50 device screen presets
Electron application with a large memory footprint Rendering is Chromium only, so it says nothing about Firefox or Safari	Device views are emulated rather than real hardware Tied to a commercial testing platform with paid tiers
Downloadable app	Downloadable app
Open source	Closed source
License: AGPL-3.0	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 22, 2026	Official website Full listing and sources Checked September 23, 2026

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