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Simlar - secure calls

Protect your privacy with encrypted phone calls.
Protect your privacy and make free mobile phone calls over the internet with Simlar. Your calls are fully encrypted and tap-proof. Simlar is very easy to use. Just select your contact and call them! After installation, all of your contacts who also use Simlar will be listed in the app automatically. Maybe some of your friends already have Simlar. If not, you can invite them easily. Simlar is also available for iPhones.

Simlar is based on the established end-to-end encryption protocol ZRTP. No one can listen to your conversation, not even us. During your first call, you need to match a short code with the person you are speaking to. This protects against man-in-the-middle attacks and only needs to be done once per contact.

The app development is driven by the open source community. You can find the source code at simlar.org.

Simlar is free of charge. All you need is an internet connection. The more stable it is, the better your sound quality. The average “traffic” corresponds to 1 megabyte for a 2-minute call. For more details see simlar.org.

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 2.7.2 (alwaysOnline) (74) suggested Added on 2022-11-28

    This version requires Android 6.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • 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.
    • 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.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • read your contacts
      Allows the app to read data about your contacts stored on your phone. Apps will also have access to the accounts on your phone that have created contacts. This may include accounts created by apps you have installed. This permission allows apps to save your contact data, and malicious apps may share contact data without your knowledge.
    • change your audio settings
      Allows the app to modify global audio settings such as volume and which speaker is used for output.
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • control vibration
      Allows the app to control the vibrator.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • read phone status and identity
      Allows the app to access the phone features of the device. This permission allows the app to determine the phone number and device IDs, whether a call is active, and the remote number connected by a call.
    • read phone numbers
      Allows the app to access the phone numbers of the device.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.
    • access Do Not Disturb
      Allows the app to read and write Do Not Disturb configuration.
    • display notifications as full screen activities on a locked device
      Allows the app to display notifications as full screen activities on a locked device
    • run foreground service
      Allows the app to make use of foreground services.
    • pair with Bluetooth devices
      Allows the app to view the configuration of the Bluetooth on the phone, and to make and accept connections with paired devices.
    • connect to paired Bluetooth devices
      Allows the app to connect to paired Bluetooth devices
    • allow Wi-Fi Multicast reception
      Allows the app to receive packets sent to all devices on a Wi-Fi network using multicast addresses, not just your phone. It uses more power than the non-multicast mode.

    Download APK 33 MiB PGP Signature | Build Log

  • Version 2.5.5 (alwaysOnline) (70) - Added on 2022-02-04

    This version requires Android 4.1 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • 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.
    • 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.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • read your contacts
      Allows the app to read data about your contacts stored on your phone. Apps will also have access to the accounts on your phone that have created contacts. This may include accounts created by apps you have installed. This permission allows apps to save your contact data, and malicious apps may share contact data without your knowledge.
    • change your audio settings
      Allows the app to modify global audio settings such as volume and which speaker is used for output.
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • control vibration
      Allows the app to control the vibrator.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • read phone status and identity
      Allows the app to access the phone features of the device. This permission allows the app to determine the phone number and device IDs, whether a call is active, and the remote number connected by a call.
    • read phone numbers
      Allows the app to access the phone numbers of the device.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.
    • access Do Not Disturb
      Allows the app to read and write Do Not Disturb configuration.
    • display notifications as full screen activities on a locked device
      Allows the app to display notifications as full screen activities on a locked device
    • run foreground service
      Allows the app to make use of foreground services.
    • pair with Bluetooth devices
      Allows the app to view the configuration of the Bluetooth on the phone, and to make and accept connections with paired devices.
    • connect to paired Bluetooth devices
      Allows the app to connect to paired Bluetooth devices

    Download APK 30 MiB PGP Signature | Build Log