Software · Education & science

Schulrechner

Schulrechner is a calculator, available on Linux and Android.

Completely free
Linux and Android
Open source

Ad-supported exit link (Clictune): an intermediate page may show for a few seconds before the official website. Direct link to the website, no intermediate page

Download for Android (F-Droid)

Link to the official download page, ad-supported (Clictune): an intermediate page may show for a few seconds. Direct link to the download

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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 Flathub, F-Droid
License: GPL-3.0 — Open source (copyleft)confirmed by Flathub, F-Droid
Open source: Yes
Commercial use: Yesconfirmed by Flathub, Official plan pages (pricing, licence, terms), F-Droid
Account required: not documented
Credit card required: Noconfirmed by Flathub, F-Droid
Watermark: Not applicable
Ads: No
Platforms: Linux and AndroidEstablished by Android: F-Droid, Unspecified source · Linux: Flathub, Unspecified source
Publisher: Joris Yidong Scholl
Latest version: 1.15.0 (5 June 2026)
Latest activity: 5 June 2026
Source code: github.com/CardiJey/schulrechner

At a glance

All of Schulrechner 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

About

This is a very early version in development. Unlabeled buttons will be implemented in the future, and bugs may be frequent. If you experience issues or have feature requests, please file an issue (link below). Frustrated by the lack of free, open-source scientific calculators that feel like the ones I am used to, I decided to reverse-engineer my old calculator from school. With features like: input of complex equations, output as fractions as well as decimals, result storage and reuse, selection and editing of equations from input history, and support for implicit multiplication (like 5π instead of 5*π), this calculator produces math that looks like the math on your paper. That makes it much more suitable for higher-level math in school and university—especially if you've grown accustomed to this kind of interface from a young age and just forgot your calculator at home. Some additional features include: A well-established open-source math.js library as the math engine—so you're not relying on some sketchy, hand-rolled math logic (just my sketchy hand-rolled input method 😛) A familiar, intuitive design 100% offline usability and fully open source Written entirely in HTML, JS, and CSS, which means it is inherently cross-platform, ... easy for other web developers to contribute and ... admittedly a bit heavy for a calculator. If you're interested in helping make a lighter version (Flutter, Kotlin, etc.), you're very welcome!

Description from Flathub — AppStream (Flathub)

Sources and checks

Facts collected from Flathub (credit card, publisher, licence, free status, platforms, commercial use, version) — 9 November 2026
Facts collected from Unspecified source (platforms) — 9 November 2026
Facts collected from Official plan pages (pricing, licence, terms) (commercial use) — 9 November 2026
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 Flathub — AppStream (Flathub)

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