Osmium is a privacy-first, fully offline authenticator for two-factor codes (TOTP/HOTP): codes are generated on-device and work without any network connection.
• Codes are computed entirely on-device — no account, no sign-up, and no telemetry.
• No connections at start-up. Osmium goes online only when you ask it to: the automatic update check is off by default, and the Terms of Use / Privacy Policy are downloaded from osmium.im only when you open them.
• Secrets are encrypted with a non-exportable key in the Android Keystore before they are written to disk.
• TOTP and HOTP: 6/7/8 digits, SHA-1/SHA-256/SHA-512; Steam Guard codes supported.
• Organize accounts with tags and search.
• Import from other apps: Google Authenticator (QR migration), Aegis, 2FAS and other common backup formats.
• Encrypted export & restore to a local file or your own WebDAV server; encrypted quick transfer between two devices on the same Wi-Fi.
• Modern Material 3 design with light/dark themes and Material You colours.
• Fully open source (GPL-3.0-or-later); release builds are reproducible — anyone can verify that the published APK matches the source code.
No ads, no trackers, no analytics.
Website: https://osmium.im
Source code: https://github.com/lihongxi-g/osmium-authenticator
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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
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x86_64
This version requires Android 8.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Permissions
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android.permission.ACCESS_LOCAL_NETWORK
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view network connections
Allows the app to view information about network connections such as which networks exist and are connected.
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view Wi-Fi connections
Allows the app to view information about Wi-Fi networking, such as whether Wi-Fi is enabled and name of connected Wi-Fi devices.
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take pictures and videos
This app can take pictures and record videos using the camera while the app is in use.
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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.
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run foreground service
Allows the app to make use of foreground services.
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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.
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show notifications
Allows the app to show notifications
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read the contents of your shared storage
Allows the app to read the contents of your shared storage.
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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.
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ask to ignore battery optimizations
Allows an app to ask for permission to ignore battery optimizations for that app.
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use biometric hardware
Allows the app to use biometric hardware for authentication
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use fingerprint hardware
Allows the app to use fingerprint hardware for authentication
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control vibration
Allows the app to control the vibrator.
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prevent phone from sleeping
Allows the app to prevent the phone from going to sleep.
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modify or delete the contents of your shared storage
Allows the app to write the contents of your shared storage.
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com.safekey.authenticator.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK
5.0 MiB
PGP Signature
|
Build Log
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arm64-v8a
This version requires Android 8.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Permissions
-
android.permission.ACCESS_LOCAL_NETWORK
-
view network connections
Allows the app to view information about network connections such as which networks exist and are connected.
-
view Wi-Fi connections
Allows the app to view information about Wi-Fi networking, such as whether Wi-Fi is enabled and name of connected Wi-Fi devices.
-
take pictures and videos
This app can take pictures and record videos using the camera while the app is in use.
-
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.
-
run foreground service
Allows the app to make use of foreground services.
-
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
-
read the contents of your shared storage
Allows the app to read the contents of your shared storage.
-
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.
-
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.
-
prevent phone from sleeping
Allows the app to prevent the phone from going to sleep.
-
modify or delete the contents of your shared storage
Allows the app to write the contents of your shared storage.
-
com.safekey.authenticator.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK
4.9 MiB
PGP Signature
|
Build Log
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armeabi-v7a
This version requires Android 8.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Permissions
-
android.permission.ACCESS_LOCAL_NETWORK
-
view network connections
Allows the app to view information about network connections such as which networks exist and are connected.
-
view Wi-Fi connections
Allows the app to view information about Wi-Fi networking, such as whether Wi-Fi is enabled and name of connected Wi-Fi devices.
-
take pictures and videos
This app can take pictures and record videos using the camera while the app is in use.
-
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.
-
run foreground service
Allows the app to make use of foreground services.
-
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
-
read the contents of your shared storage
Allows the app to read the contents of your shared storage.
-
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.
-
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.
-
prevent phone from sleeping
Allows the app to prevent the phone from going to sleep.
-
modify or delete the contents of your shared storage
Allows the app to write the contents of your shared storage.
-
com.safekey.authenticator.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK
4.9 MiB
PGP Signature
|
Build Log
