Mobile app · Utilities & files

DumberKit: Calculator

Calculator, unit and currency converter for keypad phones.

Completely free
Android
Open source

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by F-Droid
License: GPL-3.0 — Open source (copyleft)confirmed by F-Droid
Open source: Yes
Commercial use: Yesconfirmed by F-Droid
Account required: not documented
Credit card required: Noconfirmed by F-Droid
Watermark: Not applicable
Ads: No
Platforms: AndroidEstablished by Android: F-Droid
Distribution: Available on F-Droid
Publisher: lbockaj
Latest version: 1.1.0 (22 October 2026)
Latest activity: 22 October 2026
Source code: github.com/lbockaj/DumberKit-Calculator

Overview

DumberKit: Calculator is a calculator, available on Android. Other documented uses: unit conversion.

Features described in its F-Droid listing and in its GitHub repository: offline use.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“Calculator, unit and currency converter for keypad phones” — F-Droid, 10 November 2026
“Calculator apps are made of on-screen buttons.” — GitHub, 10 November 2026
“Currency converter with about 30 currencies at the European Central Bank's rates, works offline with the last ones” — F-Droid, 10 November 2026
“System, light, dark, dark red and custom themes, a keypad-friendly color picker, blue or any other icon color” — F-Droid, 10 November 2026

At a glance

All of DumberKit: Calculator is free: no feature is locked behind a paid plan, and its code is open.

Its licence (GPL-3.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
No advertising
Commercial use allowed

Sources and checks

Facts collected from F-Droid (credit card, source code, publisher, licence, free status, platforms, ads, commercial use, version) — 6 November 2026
Last technical check: 6 November 2026
Description from F-Droid — F-Droid (citation courte)

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