New in version 2.1.2
Major security and privacy update.
- Ring and Locate now disabled by default
- Locate requires a dedicated secret; Ring can use its own optional password
- Commands only run while the phone is locked
- Toggle flash, sound, vibration; optional SMS confirmation for Ring
- Location SMS includes an OpenStreetMap link; long SMS sent as multipart
- Notifications for accepted/refused commands; Android backup disabled
- Reliability and GrapheneOS compatibility fixes
Lost your phone? Send it "duper".
Why "Duper"? It's French verlan (backwards slang) for "perdu" — meaning "lost". Reverse the syllables: du-per. The app that finds what's lost, named after being lost.
Duper lets you remotely control your Android phone using SMS commands. It has no account, server, tracking SDK, or internet permission. Secrets, settings, command history, and location data stay on the device and are excluded from Android backups and device transfers.
Send "duper ring" to make your phone ring with the flashlight blinking. Useful when you've lost your phone nearby. Device and Do Not Disturb policies may limit alerts.
Send "duper locate" to receive GPS coordinates by SMS at regular intervals. Useful in an emergency or when you lend your phone to someone.
Features:
• Ring with flash, bypasses silent mode
• GPS location tracking via SMS
• Both modes stop when the phone is unlocked
• Configurable command prefix, optional Ring password, Locate secret, duration, and interval
• Custom ringtone support
• Works entirely offline over SMS
• No account, no cloud, no tracking
The Camera permission is used only to control the device torch during a ring alert. Duper does not capture photos or video. The Vibration permission is used only for ring alerts.
Location uses location permissions, including background location when the app is closed. The optional ADB-only WRITE_SECURE_SETTINGS permission lets Duper attempt to enable Android location services when they are off; it is not needed when location services are already enabled.
Ring and Locate are disabled by default. Ring can use an optional password and optional SMS confirmation; Locate requires its own secret and sends SMS responses. The app requests only the permissions needed when you enable each mode.
For privacy, remote commands run only while the phone is locked and stop when it is unlocked.
Note: On Android 13+, you may need to allow restricted settings once in the app settings before granting permissions.
Open source under GPL-3.0.
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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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
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access location in the background
This app can access location at any time, even while the app is not in use.
-
access approximate location only in the foreground
This app can get your approximate 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.
-
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.
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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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run foreground service
Allows the app to make use of foreground services.
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run foreground service with the type "location"
Allows the app to make use of foreground services with the type "location"
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run foreground service with the type "specialUse"
Allows the app to make use of foreground services with the type "specialUse"
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change your audio settings
Allows the app to modify global audio settings such as volume and which speaker is used for output.
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show notifications
Allows the app to show notifications
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receive text messages (SMS)
Allows the app to receive and process SMS messages. This means the app could monitor or delete messages sent to your device without showing them to you.
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send and view SMS messages
Allows the app to send SMS messages. This may result in unexpected charges. Malicious apps may cost you money by sending messages without your confirmation.
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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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android.permission.WRITE_SECURE_SETTINGS
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fr.sudotiz.duper.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK
1.2 MiB
PGP Signature
|
Build Log
-
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
-
access location in the background
This app can access location at any time, even while the app is not in use.
-
access approximate location only in the foreground
This app can get your approximate 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.
-
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.
-
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 "location"
Allows the app to make use of foreground services with the type "location"
-
run foreground service with the type "specialUse"
Allows the app to make use of foreground services with the type "specialUse"
-
change your audio settings
Allows the app to modify global audio settings such as volume and which speaker is used for output.
-
show notifications
Allows the app to show notifications
-
receive text messages (SMS)
Allows the app to receive and process SMS messages. This means the app could monitor or delete messages sent to your device without showing them to you.
-
send and view SMS messages
Allows the app to send SMS messages. This may result in unexpected charges. Malicious apps may cost you money by sending messages without your confirmation.
-
control vibration
Allows the app to control the vibrator.
-
prevent phone from sleeping
Allows the app to prevent the phone from going to sleep.
-
android.permission.WRITE_SECURE_SETTINGS
-
fr.sudotiz.duper.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK
1.2 MiB
PGP Signature
|
Build Log
New in version 1.1.5
Initial public release.
-
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
-
access location in the background
This app can access location at any time, even while the app is not in use.
-
access approximate location only in the foreground
This app can get your approximate 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.
-
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.
-
access Do Not Disturb
Allows the app to read and write Do Not Disturb configuration.
-
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"
-
change your audio settings
Allows the app to modify global audio settings such as volume and which speaker is used for output.
-
show notifications
Allows the app to show notifications
-
read your text messages (SMS or MMS)
This app can read all SMS (text) messages stored on your phone.
-
receive text messages (SMS)
Allows the app to receive and process SMS messages. This means the app could monitor or delete messages sent to your device without showing them to you.
-
send and view SMS messages
Allows the app to send SMS messages. This may result in unexpected charges. Malicious apps may cost you money by sending messages without your confirmation.
-
prevent phone from sleeping
Allows the app to prevent the phone from going to sleep.
-
android.permission.WRITE_SECURE_SETTINGS
-
fr.sudotiz.duper.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Download APK
1.2 MiB
PGP Signature
|
Build Log
