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Zenwell vs BlockSite: catalog facts
Zenwell	BlockSite
Free Free and open source under the GPL-3.0 licence.	Freemium Free to start; BlockSite Premium is a paid subscription with a 30-day guarantee.
Android	Android, iOS, Browser extension
Blocks selected apps such as Instagram or YouTube Shorts Math puzzles or breathing exercises as an unlock step	Blocks both websites and apps Focus Mode for timed work sessions
Android only Determined users can still get past the challenge	Some features require a paid Premium subscription Closed-source commercial product
Downloadable app	Downloadable app, Browser extension
Open source	Closed source
License: GPL-3.0-or-later	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 October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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