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Opal vs Curbox: catalog facts
Opal	Curbox
Freemium Free to download, with a paid Opal Pro subscription for more features.	Free Free and open source under the GPL 3.0 or later.
macOS, Android, iOS	Android
App blocking rules that apply on phone and desktop Focus timer that locks apps until it runs out	Blocks Reels and Shorts without blocking the whole app Wide choice of unlock challenges, including NFC and QR codes
Some features require the paid Pro subscription Gamified rewards and friend invites may not suit everyone	Android only Self-imposed limits can still be worked around by a determined user
Downloadable app	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 October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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