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Polypane vs Sizzy: catalog facts
Polypane	Sizzy
Paid A paid subscription is required after the trial.	Paid A paid subscription is required after the trial.
Windows, macOS, Linux, Browser extension	Windows, macOS, Linux
Accessibility simulation and checks built into the browser itself Synchronised panes with live CSS editing across all of them	Project workspaces keep devices, URLs and sessions together Isolated sessions per project avoid cookie collisions between clients
Paid subscription with no free tier beyond a trial Chromium rendering only	Paid subscription Chromium rendering only
Downloadable app, Browser extension	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 22, 2026	Official website Full listing and sources Checked September 22, 2026

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