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Qalculate!Uno Calculator
Free

Free and open source under the GPL.

 Free

Free to use; the underlying calculator code is under the Apache-2.0 licence.

Windows, macOS, Linux macOS, Linux, Android, iOS, Web
  • Unit calculations, unit conversion and live currency conversion built in
  • Symbolic calculation including integrals and equations, with arbitrary precision
  • Familiar Windows Calculator layout on other systems
  • Scientific and Programmer modes
  • Currency rates need an internet connection to update
  • The sheer number of functions and settings is daunting at first
  • Initial load can be slow
  • Built mainly as a framework showcase
Downloadable app Downloadable app, Web application
Open source Open source
License: GPL-2.0 License: Apache-2.0
No account needed No account needed
Works offline Not stated if it works offline

Checked September 21, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.