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Fossify Messages vs QUIK: catalog facts
Fossify Messages	QUIK
Free Free and open source under the GPL-3.0, with no ads.	Free Free and open source under the GPL-3.0.
Android	Android
No ads or tracking libraries Blocking by number and by keyword	Scheduled and delayed messages Built-in message backup
SMS and MMS only, no end-to-end encrypted chat Android only	Handles SMS and MMS only, which are not end-to-end encrypted Android only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: GPL-3.0-only
No account 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.