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Qalculate!ABCalc Plus
Free

Free and open source under the GPL.

 Paid

ABCalc Plus is a paid edition; the standard ABCalc version is free.

Windows, macOS, Linux Windows, macOS, Linux, Android, iOS
  • Unit calculations, unit conversion and live currency conversion built in
  • Symbolic calculation including integrals and equations, with arbitrary precision
  • More than 100 built-in functions and over 100 unit conversions
  • Supports complex numbers and vectors
  • Currency rates need an internet connection to update
  • The sheer number of functions and settings is daunting at first
  • Some features and cloud sync depend on the platform
Downloadable app Downloadable app
Open source Closed source
License: GPL-2.0 License: proprietary
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 21, 2026

Checked October 8, 2026

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