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Fossify Messages vs Deku SMS: catalog facts
Fossify Messages	Deku SMS
Free Free and open source under the GPL-3.0, with no ads.	Free Free and open source under the GPL-3.0 licence.
Android	Android
No ads or tracking libraries Blocking by number and by keyword	End-to-end encrypted SMS Message forwarding to the cloud
SMS and MMS only, no end-to-end encrypted chat Android only	Android only Encrypted messaging needs a compatible app on the other end
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: GPL-3.0-or-later
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.