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ELM327 Emulator

OBD-II ELM327 adapter emulator for testing diagnostic apps
New in version 29
- make the emulator device ip always the same default 192.168.0.10 (root required)
- fix crash when switching theme
- add ignition on/off button as some scantool check it
- extend compat of app lower with android versions
- fix memory leaks in jni
Simulates an ELM327 OBD-II interface over Bluetooth/BLE/network.
Useful for development and testing without a real vehicle.
Support many protocols CAN, KWP2000, ... any supported by ELM327.
Support OBD-II messages.
Track what have been sent by the scantool using the log.

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 29 (29) suggested Added on Aug 04, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 5.1 or newer.

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

    Permissions
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
    • 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.
    • access Bluetooth settings
      Allows the app to configure the local Bluetooth phone, and to discover and pair with remote devices.
    • advertise to nearby Bluetooth devices
      Allows the app to advertise to nearby Bluetooth devices
    • connect to paired Bluetooth devices
      Allows the app to connect to paired Bluetooth devices
    • discover and pair nearby Bluetooth devices
      Allows the app to discover and pair nearby Bluetooth devices
    • connect and disconnect from Wi-Fi
      Allows the app to connect to and disconnect from Wi-Fi access points and to make changes to device configuration for Wi-Fi networks.
    • 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.
    • interact with nearby Wi-Fi devices
      Allows the app to advertise, connect, and determine the relative position of nearby Wi-Fi devices
    • com.github.autodiag2.elm327emu.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 9 MiB PGP Signature | Build Log

  • New in version 28
    - improve logo compat
    - improve compat with android 9
    - improve the group function
    - improve bluetooth support with mtu mostly
  • Version 28 (28) - Added on Jul 31, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 9.0 or newer.

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

    Permissions
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
    • 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.
    • access Bluetooth settings
      Allows the app to configure the local Bluetooth phone, and to discover and pair with remote devices.
    • advertise to nearby Bluetooth devices
      Allows the app to advertise to nearby Bluetooth devices
    • connect to paired Bluetooth devices
      Allows the app to connect to paired Bluetooth devices
    • discover and pair nearby Bluetooth devices
      Allows the app to discover and pair nearby Bluetooth devices
    • connect and disconnect from Wi-Fi
      Allows the app to connect to and disconnect from Wi-Fi access points and to make changes to device configuration for Wi-Fi networks.
    • 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.
    • interact with nearby Wi-Fi devices
      Allows the app to advertise, connect, and determine the relative position of nearby Wi-Fi devices
    • com.github.autodiag2.elm327emu.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 310 MiB PGP Signature | Build Log

  • New in version 27
    - add setting to turn wifi hotspot on from the app with a qrcode
    - fix issue in the sim where scantool use ELM optimized sends
    - add possibility to change parameters of generators (more than simple context)
    - search logs feature
    - group by logs
    - add checksum to legacy protocols (CRC, additive)
  • Version 27 (27) - Added on Jul 28, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 9.0 or newer.

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

    Permissions
    • access precise location only in the foreground
      This app can get your precise location from location services while the app is in use. Location services for your device must be turned on for the app to get location. This may increase battery usage.
    • 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.
    • access Bluetooth settings
      Allows the app to configure the local Bluetooth phone, and to discover and pair with remote devices.
    • advertise to nearby Bluetooth devices
      Allows the app to advertise to nearby Bluetooth devices
    • connect to paired Bluetooth devices
      Allows the app to connect to paired Bluetooth devices
    • discover and pair nearby Bluetooth devices
      Allows the app to discover and pair nearby Bluetooth devices
    • connect and disconnect from Wi-Fi
      Allows the app to connect to and disconnect from Wi-Fi access points and to make changes to device configuration for Wi-Fi networks.
    • 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.
    • interact with nearby Wi-Fi devices
      Allows the app to advertise, connect, and determine the relative position of nearby Wi-Fi devices
    • com.github.autodiag2.elm327emu.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 311 MiB PGP Signature | Build Log