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SMSecure vs QUIK: catalog facts
SMSecure	QUIK
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL-3.0.
Android	Android
Encrypted conversations over ordinary SMS Continues the Silence and TextSecure line on current Android	Scheduled and delayed messages Built-in message backup
Encryption only works when the contact also uses a compatible app 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	License: GPL-3.0-only
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.