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BlockSite vs Zenwell: catalog facts
BlockSite	Zenwell
Freemium Free to start; BlockSite Premium is a paid subscription with a 30-day guarantee.	Free Free and open source under the GPL-3.0 licence.
Android, iOS, Browser extension	Android
Blocks both websites and apps Focus Mode for timed work sessions	Blocks selected apps such as Instagram or YouTube Shorts Math puzzles or breathing exercises as an unlock step
Some features require a paid Premium subscription Closed-source commercial product	Android only Determined users can still get past the challenge
Downloadable app, Browser extension	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
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 October 2, 2026

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