Compare software

Bluecheese vs Kryptos: catalog facts
Bluecheese	Kryptos
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the AGPL-3.0 licence.
Android	Android, iOS
Works fully offline Uses PBKDF2 with AES-GCM authenticated encryption	Adds end-to-end encryption on top of any messaging app or SMS Uses the Signal Protocol with keys stored on the device
Android only Text only, not files	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: GPL-3.0-only	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.