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Fossify Messages vs SMSecure: catalog facts
Fossify Messages	SMSecure
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	Encrypted conversations over ordinary SMS Continues the Silence and TextSecure line on current Android
SMS and MMS only, no end-to-end encrypted chat Android only	Encryption only works when the contact also uses a compatible app Android only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: GPL-3.0
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.