DozenCalc

DozenCalc is a calculator application developed by F-Droid Open Source, packaged as a single Android APK of version 0.9 weighing in at 2.5 MB. The package targets Android 4.1+ and above. Below you'll find the publisher's own description, a quick spec sheet, and a short buyer-beware checklist so you know exactly what you're installing before tapping download.

1. Only download through the button on this page — never from third-party mirrors or shortened links, which are the most common way malware spreads.
2. File size is a light 2.5 MB, so it installs quickly even on modest connections.
3. This build is signed by "F-Droid Open Source" — always verify the developer name matches what's listed on the app's official store page before installing an update.
4. After install, Android may prompt you to allow "Install from unknown sources" — approve only this one install, then revoke the permission in Settings > Apps > Special access.
5. We link directly to the APK file or the publisher's repository; we do not modify the binary. Always run a virus scan after any sideloaded install.

A dozenal (duodecimal, or base-twelve) calculator with both
simple and scientific modes. Simple mode (automatically
chosen when in portrait orientation) contains the four
functions, square roots, exponents, and parentheses for
grouping, and operates to four digits of fractional
accuracy. Scientific mode (automatically chosen when in
landscape orientation) has all of the same features, plus
trigonometric functions and their inverses, logarithms,
reciprocals, buttons for pi and the base of the natural
logarithm, and variable precision allowing the user to
select the number of fractional digits desired.

Is DozenCalc free to download?
Yes. The APK file linked from this page is free. The developer may offer in-app purchases once installed, but obtaining the installer itself costs nothing.

What Android version does DozenCalc require?
Android 4.1+ or newer. Installing on older devices may cause crashes or refuse to install.

Is DozenCalc safe to install?
We link to the exact APK published by F-Droid Open Source. We do not modify the file. Still, as with any sideloaded app, scan it with a reputable antivirus before opening it, and only grant permissions the app genuinely needs.

How do I update DozenCalc?
Install the newer version on top of the old one — Android will keep your data. If the signature differs, uninstall first (you may lose local progress).

Why is the app not installing?
Common causes: not enough storage, an older Android version than 4.1+, or a conflicting build already installed. Free up space, check your OS version, and uninstall any previous copy before retrying.

1. Tap the Download APK button above and save the file to your device.
2. Open your device Settings → Security (or Apps → Special access → Install unknown apps) and allow your file manager or browser to install unknown apps for this one file only.
3. Open the downloaded com.example.dozencalc.apk file from your Downloads folder.
4. Tap Install and wait for Android to finish.
5. Open «DozenCalc» by F-Droid Open Source and grant only the permissions it actually needs.
6. Revoke the "unknown sources" permission once you are done installing.

Note: this page hosts or links to the installer only. The application name, icon and description are provided for identification. All trademarks belong to their respective owners.