Pseudo random number predictor
About this app
Predicts pseudo random numbers based on a sequence of observed numbers.
Enter a sequence of numbers that you obtained from a pseudo random number generator like, for instance, the Java standard pseudo random number generator or the Mersenne Twister MT19937. The app will then try to predict following numbers from the generator.
The app expects all numbers to be entered as integers or floating point numbers between zero and one. Currently, floating point numbers are supported for the Mersenne Twister only. Three input modes are supported: 1. Text field lets you enter the numbers directly on the device. 2. File lets you choose a file with newline separated number strings. 3. Socket opens a server socket on the device. You can then connect with a custom client by means of a client socket and send newline separated number strings to the server. After each number the server will send back the next newline separated predictions. Each block of predictions is separated by an additional newline.
To test the app, enter the following numbers in the Text field:
1412437139 1552322984 168467398 1111755060 -928874005
These numbers were sampled from the Java linear congruential generator Random.nextInt(). Thus, the app should detect LCG: Java after the third number input, and numbers in the prediction history should appear in green instead of red, indicating that those numbers were correctly predicted.
The source code of this app is published on GitLab. There you can also find a Python program for testing socket input: https://gitlab.com/asnelt/derandom/blob/HEAD/README.md
Licensed under Apache-2.0, by Arno Onken.
What's New in v2.7
Imported from the F-Droid repository index.
- Made adjustments for Android 17.
Version history
Jul 14, 2026 · 3 MB · Android API 21–37 · code 17
Imported from the F-Droid repository index.
- Made adjustments for Android 17.
SHA-256 e06fe1efbee5c64195ff69f72cc62456795d51e40517f9c0da4127edd61f5122
Dec 1, 2025 · 3 MB · Android API 21–36 · code 16
Imported from the F-Droid repository index.
- Made adjustments for Android 16.
SHA-256 7a68e55b2e7da4dc7d7b10d1b2208617161b7e0d58680c2d8f20bdfd325f8085
Jul 19, 2024 · 3 MB · Android API 21–35 · code 15
Imported from the F-Droid repository index.
- Made adjustments for Android 15.
- Improved number history scrolling.
- Improved reliability of double numbers processing.
- Updated logo.
SHA-256 b92260322efc1ab9741cf1de17b7c56cda1c94f26175997c92c11e406584c492
Will it run on your device?
78%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be org.asnelt.derandom is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 2.6 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Derandom first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Derandom, and a listing is removed when the evidence for it stops holding up.
Get Derandom
Every source we list for org.asnelt.derandom is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
e06fe1efbee5c64195ff69f72cc62456795d51e40517f9c0da4127edd61f5122
Signing certificate
1dfcde78bf44cd8b6f1a4eb71c216f0141a61a1dbe92dbae2270399a346faf90
Permissions Required
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
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