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LT Browser vs Polypane: catalog facts
LT Browser	Polypane
Freemium Free to download, with paid tiers as part of the TestMu AI platform.	Paid A paid subscription is required after the trial.
Windows, macOS, Linux	Windows, macOS, Linux, Browser extension
Views several device viewports side by side More than 50 device screen presets	Accessibility simulation and checks built into the browser itself Synchronised panes with live CSS editing across all of them
Device views are emulated rather than real hardware Tied to a commercial testing platform with paid tiers	Paid subscription with no free tier beyond a trial Chromium rendering only
Downloadable app	Downloadable app, Browser extension
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 22, 2026

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