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Kryptos vs Bluecheese: catalog facts
Kryptos	Bluecheese
Best for: Adding encryption to conversations in messengers you do not trust	Best for: Sending short secret text over an ordinary messaging app
Free Free and open source under the AGPL-3.0 licence.	Free Free and open source under the GPL-3.0 licence.
Android, iOS	Android
Adds end-to-end encryption on top of any messaging app or SMS Uses the Signal Protocol with keys stored on the device All 4 strengths for Kryptos Adds end-to-end encryption on top of any messaging app or SMS Uses the Signal Protocol with keys stored on the device No accounts or servers; works offline Works between iPhone and Android	Works fully offline Uses PBKDF2 with AES-GCM authenticated encryption All 4 strengths for Bluecheese Works fully offline Uses PBKDF2 with AES-GCM authenticated encryption No ads or tracking Simple interface for quick use
Not in the App Store; iOS install requires sideloading or signing Both people need Kryptos to read the messages All 3 limitations for Kryptos Not in the App Store; iOS install requires sideloading or signing Both people need Kryptos to read the messages Messenger still sees who you talk to and when	Android only Text only, not files All 3 limitations for Bluecheese Android only Text only, not files Both parties need the app and a shared password
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0-only	License: GPL-3.0-only
No account needed	No account needed
Offline features available	Offline features available
Official website Full listing and sources Sources for Kryptos datakeeper.pages.dev/kryptos github.com/swisslite/Kryptos Catalog checked October 2, 2026	Official website Full listing and sources Sources for Bluecheese github.com/msbCyricTohoku/Bluecheese-fdroid f-droid.org/packages/com.msb.bluecheese Catalog checked October 2, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.