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CryptoSafe

Offline AES-256-GCM text encryption with Argon2id, no internet permission
New in version 2.1.1
• Encrypted Boxes (Chat) with per-box passwords
• App Lock with PIN and Biometric unlock
• Encrypted database (SQLCipher)
• Receive encrypted texts from other apps
• Share encrypted texts from a message box with other apps
• Auto-delete messages (1h to 90 days)
• Settings screen
• Help & Guide screen with detailed documentation
CryptoSafe is a fully offline app for encrypting and decrypting text. It doesn't use the internet at all, and everything stays on your phone.

Features:
• Anonymous Boxes: chat in password-protected boxes, each with its own password
• Strong encryption: AES-256-GCM with Argon2id key derivation
• App Lock: PIN and fingerprint unlock with an auto-lock timer
• Encrypted database (SQLCipher): nothing is stored in plaintext
• Share into a box: receive encrypted texts from WhatsApp, Telegram and other apps directly into a box
• Share from a box: share encrypted texts from a message box with other apps
• Auto-delete messages (from 1 hour to 90 days)
• Box lock modes: ask every time, remember for a while, keep for the session, or remember permanently
• Built-in password generator with strength indicator
• Screenshot protection on every screen
• Help & Guide screen with detailed documentation
• Translated into 15 languages

Help us improve: report issues or suggest features at https://github.com/nemoXdev/CryptoSafe/issues, or contribute a translation at https://github.com/nemoXdev/CryptoSafe/blob/develop/app/src/main/assets/locales/README.md. With your contribution, the app keeps getting better.
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Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

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  • Version 2.1.1 (10) suggested Added on Aug 13, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 7.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • run foreground service
      Allows the app to make use of foreground services.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • com.cryptosafe.app.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 10 MiB PGP Signature | Build Log

    • New in version 2.0.0
    • Encrypted Boxes (Chat) with per-box passwords
    • App Lock with PIN and Biometric unlock
    • Encrypted database (SQLCipher)
    • Share intent from other apps
    • Auto-delete messages (1h to 90 days)
    • Settings screen
    • Help & Guide screen with detailed documentation
    • General improvements and bug fixes
  • Version 2.0.0 (8) - Added on Aug 10, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 7.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • com.cryptosafe.app.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 10 MiB PGP Signature | Build Log

    • New in version 1.3.0
    • Add random password generator.
    • Fix app crash with long passwords.
    • General improvements.
  • Version 1.3.0 (7) - Added on Jul 20, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 7.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • com.cryptosafe.app.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 2.4 MiB PGP Signature | Build Log

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