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Qalculate!Chalk
Free

Free and open source under the GPL.

 Free

Free calculator software; the developer provides downloads.

Windows, macOS, Linux macOS
  • Unit calculations, unit conversion and live currency conversion built in
  • Symbolic calculation including integrals and equations, with arbitrary precision
  • Designed for both everyday and scientific calculations
  • Documentation and examples are available
  • Currency rates need an internet connection to update
  • The sheer number of functions and settings is daunting at first
  • Available for macOS
Downloadable app Downloadable app
Open source Closed source
License: GPL-2.0 License not stated
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.