(SECUSO) Measure the size of objects in pictures with a reference object size
About this app
Privacy Friendly Tape Measure can measure the size of objects in pictures based on objects of known sizes (e.g. coins) in the same picture. Just find a coin or other reference object of a known size, put it next to the item you want measured and take a picture. Make sure all objects are in the same level and the picture is taken perpendicularly to it. Now you can mark the reference object in the picture and measure any length or area you want!
Privacy Friendly Tape Measure belongs to the Privacy Friendly Apps group developed by the research group SECUSO at Karlsruhe Institute of Technology. More information can be found an https://secuso.org/pfa
Privacy Friendly Tape Measure can also display rulers or a protractor on the screen. Use this to quickly measure small objects or to cut a pizza in six equal slices. Yum!
What makes Privacy Friendly Tape Measure different from other similar apps?
1. Fewer permissions Privacy Friendly Tape Measure uses only the Read External Storage permission. It needs it because most pictures on your phone are located on the SD-card as opposed to the internal phone memory.
2. No advertisement Many other free apps in the Google Play Store dazzle you with annoying advertisements which also shorten battery life.
Feel free to contact 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 v1.1.3
Imported from the F-Droid repository index.
Version history
Aug 7, 2025 · 7.9 MB · Android API 21–34 · code 100
Imported from the F-Droid repository index.
SHA-256 2f7a7daa7b3c5211f84143929e5cca7d7f77ae30bf7516a9b711e62f98f73f1d
Apr 25, 2025 · 7.9 MB · Android API 21–34 · code 6
Imported from the F-Droid repository index.
SHA-256 f3b1a99291aff7a2891f58a7be17d9b75646e905f50166633bf0bd1ae6c43da9
Oct 20, 2024 · 6.1 MB · Android API 21–34 · code 5
Imported from the F-Droid repository index.
SHA-256 cf920e1e984054cd58cd7506b68b2abae338849ef6899e6e59fd9d8a14f81425
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.privacyfriendlytapemeasure 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, 1.1.2 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Tape Measure (Privacy Friendly) 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 Tape Measure (Privacy Friendly), and a listing is removed when the evidence for it stops holding up.
Get Tape Measure (Privacy Friendly)
Every source we list for org.secuso.privacyfriendlytapemeasure 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
2f7a7daa7b3c5211f84143929e5cca7d7f77ae30bf7516a9b711e62f98f73f1d
Signing certificate
e13fa63f67686a8e30368ff25e8c3e906ebe1fdd7a5b42d58d0321ee12b6a83d
Permissions Required
What each permission lets Tape Measure (Privacy Friendly) do. A highlighted one is worth a second look — not necessarily wrong, just worth asking whether this app needs it.
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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