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LT Browser vs Sizzy: catalog facts
LT Browser	Sizzy
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
Views several device viewports side by side More than 50 device screen presets	Project workspaces keep devices, URLs and sessions together Isolated sessions per project avoid cookie collisions between clients
Device views are emulated rather than real hardware Tied to a commercial testing platform with paid tiers	Paid subscription Chromium rendering only
Downloadable app	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
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.