(SECUSO) Circuit Trainer supports the user during circuit training sessions.
About this app
Privacy Friendly Circuit Trainer is an Android App that supports the user during their circuit training session. It provides a configurable set of timers for the exercises and the rest phases as well as multiple other features.
Workout Timer After configuring the set of timers in the main menu you can start the workout routine by pressing the start button. The workout view has animations and sound output features which can be turned on and off inside the settings menu.
Motivation Alert The app can show you motivation alerts to remind you of planned workout sessions. You can define the time of day and the notification texts inside the settings menu.
Block Periodization When scheduling the timers you may also choose the block periodization feature. This feature allows you to configure longer, separate breaks in between the exercises. This way the workout can be split into multiple high intensity workout cycles.
Workout History The app can collect statistics about your performed workout sessions. The collected data comprises of the time spend working out and the calories burnt while exercising. The accuracy of the calories calculation can be improved by configuring the necessary user data in the settings menu. The collection of this data can be deleted as well as turned on and off inside the settings menu.
Exercise Sets The app allows you to create your own Exercise Sets for the circuit training. Therefore you can combine your own exercises to exercise sets. The image assigned to an exercise is displayed during the workout. In addition, the exercise sets can be repeated during a workout. For this you can set the number of rounds before starting the workout.
How does Privacy Friendly Circuit Trainer differ from other similar apps?
1. No permissions Privacy Friendly Circuit Trainer does not require any permissions. The selection of images is done by a task to the gallery so the app does not have any access to the device's storage without the user's control and interaction.
2. No advertisement Many other free apps in the Google Play Store dazzle annoying advertising and also shortens battery life.
Privacy Friendly Circuit Training is part of the Privacy Friendly Apps group developed by the research group SECUSO at Technische Universität Darmstadt. More information at: https://secuso.org/pfa
You can reach us via Bluesky - @secusoresearch.bsky.social https://bsky.app/profile/secusoresearch.bsky.social Mastodon - @SECUSO_Research@bawü.social https://xn--baw-joa.social/@SECUSO_Research/ Job opening - https://secuso.aifb.kit.edu/english/Job_Offers.php
Licensed under GPL-3.0-or-later, by SECUSO - Security Usability Society.
What's New in v1.2.4
Imported from the F-Droid repository index.
Version history
Jul 21, 2025 · 7.9 MB · Android API 21–34 · code 100
Imported from the F-Droid repository index.
SHA-256 887104974726cfddbe247941e76301ef0d66f6d095cfdcc2d7ffee2695867ed4
Apr 25, 2025 · 7.9 MB · Android API 21–34 · code 6
Imported from the F-Droid repository index.
SHA-256 ac9a45535021b00d6afdf849e1197799b1717d9121027a990f70b39464315481
Nov 5, 2023 · 6 MB · Android API 21–33 · code 4
Imported from the F-Droid repository index.
SHA-256 fcab1a55d90c3f55f665c7cb3113bb22be2fe43c5b7b978a4400d5422e63c66a
Will it run on your device?
73%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
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.secuso.privacyfriendlycircuittraining 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, 1.2.3 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Circuit Training (PFA) 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 Circuit Training (PFA), and a listing is removed when the evidence for it stops holding up.
Get Circuit Training (PFA)
Every source we list for org.secuso.privacyfriendlycircuittraining 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
887104974726cfddbe247941e76301ef0d66f6d095cfdcc2d7ffee2695867ed4
Signing certificate
2fbf6da4e686399b2a7a68956cd005fdca67b0fe1075067db366ea51fbff8096
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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