Easily operate with uncertainty
About this app
A calculator that can deal with distributions ergonomically, to allow users to easily arrive at fermi estimates that incorporate uncertainty.
Tips:
■ The boxes represent the 90% confidence interval (5% to 95%) of your distributions ■ Swipe left or right to duplicate an input
Try this example estimating the number of grams lost with a month of exercise lifting:
10 to 30 kg lifted per exercise × 0.25 to 0.75 meters lifted per exercise × 9.81 gravitational constant, to get to Jules (swipe left at the bottom to duplicate the input) × 10 reps per set × 3 to 4 sets per exercise ÷ 15% 35%, wild guess on chemical to physical efficiency conversion ÷ 4, jules to calories ÷ 6K to 8K, calories burnt to lose one gram of fat × 7 to 15 exercises in a gym session × 2 to 4 times a week × 4 weeks a month ÷ 10% to 30%, wild guess for share of loss that is due to the direct physical exercise (as opposed to higher burn rate, cost of building muscles, etc.) = ¿ to ? grams lost with the above exercise regime in a month
Licensed under MIT, by Nuño Sempere.
What's New in v0.03.01
Imported from the F-Droid repository index.
- Add history and tips screens
- - Also: change higher field on suffix
- - State is preserved when visiting history
- - Update screenshots
Version history
Jul 24, 2025 · 6 MB · Android API 24–34 · code 301
Imported from the F-Droid repository index.
- Add history and tips screens
- - Also: change higher field on suffix
- - State is preserved when visiting history
- - Update screenshots
SHA-256 ea67bd850f1af525bfab7a38aaf36e2a1b5dd290fdabdfacb754e069d43d3874
Apr 22, 2025 · 5.9 MB · Android API 24–34 · code 207
Imported from the F-Droid repository index.
- force portrait mode, duplicate left input automatically; wipe inputs more often
- Duplicating left input automatically might save people a
- couple of clicks when operating with scalars. If instead of
- clicking "=" the user clicks the right field, the field resets
- to zero so that the user can type normally.
- Additionally, inputs are now wiped to 0.0 when clicking their respective fields,
SHA-256 4123a4c6acec41370539c10973107f727f607afd0e905b46c56ff51d90b78fbc
Mar 28, 2025 · 5.9 MB · Android API 24–34 · code 206
Imported from the F-Droid repository index.
- Improve description and documentation, add screenshots with 90% confidence interval labels
SHA-256 5af17b0b5821fe17afce5e9503936226e87682eecf61810750f93d95c91f438a
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 com.nunosempere.distributioncalculator 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, 0.02.07 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Distribution Calculator 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 Distribution Calculator, and a listing is removed when the evidence for it stops holding up.
Get Distribution Calculator
Every source we list for com.nunosempere.distributioncalculator 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
ea67bd850f1af525bfab7a38aaf36e2a1b5dd290fdabdfacb754e069d43d3874
Signing certificate
67cf29fd52d25d0355665feb0c8ec4bb42d5ce03e2435c4993c1c567e48bd54d
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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