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Kryptos vs CryptoSafe: catalog facts
Kryptos	CryptoSafe
Best for: Adding encryption to conversations in messengers you do not trust	Best for: Encrypting short messages or notes by password on Android
Free Free and open source under the AGPL-3.0 licence.	Free Free and open source under the MIT licence, with optional donations.
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 with no network access AES-256-GCM with Argon2id key derivation All 3 strengths for CryptoSafe Works fully offline with no network access AES-256-GCM with Argon2id key derivation Separate password per Anonymous Box
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	Encrypts text only, not files Small project with a single maintainer
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0-only	License: MIT
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 CryptoSafe github.com/nemoXdev/CryptoSafe f-droid.org/packages/com.cryptosafe.app Catalog checked October 2, 2026

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