Compare software

Salty vs Kryptos: catalog facts
Salty	Kryptos
Free Free and open source under the MIT licence.	Free Free and open source under the AGPL-3.0 licence.
Android	Android, iOS
AES-256-GCM encryption with PBKDF2 key derivation Works offline and keeps history on the device	Adds end-to-end encryption on top of any messaging app or SMS Uses the Signal Protocol with keys stored on the device
Both sides must exchange the shared key securely beforehand Android only	Not in the App Store; iOS install requires sideloading or signing Both people need Kryptos to read the messages
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: AGPL-3.0-only
No account needed	No account needed
Works offline	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.