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Kryfo

Private messages over Tor. No phone number, no account, no metadata trail.
New in version 0.5.3
New: a video you record plays before you send it, card donations, and a guide for phones that stop apps in the background.

Steadier: Tor rides out short drops more quietly, and automatic bridges were tested in heavily censored countries. Swipe to reply keeps your place, and backups say where they went.

Fixed: the fingerprint could not be turned back on after an update on some phones.
A private messenger. No phone number, no email, no account. You are a key
pair generated on your device. On the default route, nobody, including us,
can tie your chats to a real identity, and no one can look you up unless
you claim a public handle.

By default everything travels over Tor. Content is end to end encrypted with
the Signal protocol. Messages travel through relays, sealed so no relay can
read them, and on the default route the relays never learn your IP address
or who you are. No address book upload, ever.

Features:

* Works where Tor is blocked: Kryfo finds a way around it by itself
* Delivery through Nostr relays, so messages reach a phone that was offline
* Groups with photos, files, voice messages, replies, reactions, pins and polls
* Animated stickers that travel as a name, so no picture leaves the phone
* Search across all your chats, kept in the encrypted database
* Timed messages that burn after a set time
* Encrypted local database and encrypted backups
* App lock with PIN or biometrics, a decoy PIN that opens an empty Kryfo, and hidden chats behind a PIN of their own
* Panic wipe that removes everything, including media on disk
* A chat with the person who builds Kryfo, anonymous if you like
* 15 languages
* No analytics or telemetry

Funding: no ads, no investors. It runs on what backers give. Backing is
optional and anonymous, and every feature works the same either way.
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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.

Download F-Droid
  • Version 0.5.3 (253) suggested Added on Oct 25, 2026

    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.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "specialUse"
      Allows the app to make use of foreground services with the type "specialUse"
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications
    • 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.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • control vibration
      Allows the app to control the vibrator.
    • app.kryfo.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 74 MiB PGP Signature | Build Log

  • Version 0.5.3 (252) - Added on Oct 25, 2026

    arm64-v8a

    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.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "specialUse"
      Allows the app to make use of foreground services with the type "specialUse"
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications
    • 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.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • control vibration
      Allows the app to control the vibrator.
    • app.kryfo.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 70 MiB PGP Signature | Build Log

  • Version 0.5.3 (251) - Added on Oct 25, 2026

    armeabi-v7a

    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.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "specialUse"
      Allows the app to make use of foreground services with the type "specialUse"
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications
    • 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.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • control vibration
      Allows the app to control the vibrator.
    • app.kryfo.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 64 MiB PGP Signature | Build Log

    • New in version 0.5.2
    New: albums, send any kind of file, export your notes, accent colours, and screenshot blocking per chat that holds on both phones.

    Safer: every message is padded to a few fixed sizes, and "This isn't them" when safety numbers don't match.

    Fixed: GIFs line up on the right, Tor's status reads in the light theme, and sheets stay above the keyboard.
  • Version 0.5.2 (243) - Added on Oct 22, 2026

    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.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "specialUse"
      Allows the app to make use of foreground services with the type "specialUse"
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications
    • 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.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • control vibration
      Allows the app to control the vibrator.
    • app.kryfo.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 74 MiB PGP Signature | Build Log

  • Version 0.5.2 (242) - Added on Oct 22, 2026

    arm64-v8a

    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.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "specialUse"
      Allows the app to make use of foreground services with the type "specialUse"
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications
    • 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.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • control vibration
      Allows the app to control the vibrator.
    • app.kryfo.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 69 MiB PGP Signature | Build Log

  • Version 0.5.2 (241) - Added on Oct 22, 2026

    armeabi-v7a

    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.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "specialUse"
      Allows the app to make use of foreground services with the type "specialUse"
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications
    • 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.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • control vibration
      Allows the app to control the vibrator.
    • app.kryfo.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 64 MiB PGP Signature | Build Log

    • New in version 0.5.1
    Please update to 0.5.1: it contains security fixes. We will publish the details in about a week.

    New: bridges that step in when Tor is blocked, a clearer voice disguise per chat, a key number to check on pair codes, sharing from other apps, and private GIF search.

    Fixed: lost first messages to someone new, Tor stuck after a network change, and a crash at launch on some newer phones.
  • Version 0.5.1 (233) - Added on Oct 18, 2026

    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.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "specialUse"
      Allows the app to make use of foreground services with the type "specialUse"
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications
    • 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.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • control vibration
      Allows the app to control the vibrator.
    • app.kryfo.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 73 MiB PGP Signature | Build Log

  • Version 0.5.1 (232) - Added on Oct 18, 2026

    arm64-v8a

    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.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "specialUse"
      Allows the app to make use of foreground services with the type "specialUse"
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications
    • 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.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • control vibration
      Allows the app to control the vibrator.
    • app.kryfo.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 68 MiB PGP Signature | Build Log

  • Version 0.5.1 (231) - Added on Oct 18, 2026

    armeabi-v7a

    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.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "specialUse"
      Allows the app to make use of foreground services with the type "specialUse"
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications
    • 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.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • ask to ignore battery optimizations
      Allows an app to ask for permission to ignore battery optimizations for that app.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • control vibration
      Allows the app to control the vibrator.
    • app.kryfo.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 63 MiB PGP Signature | Build Log

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