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Uno CalculatorSpeedCrunch
Free

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

 Free

Free and open source under the GPL.

macOS, Linux, Android, iOS, Web Windows, macOS, Linux
  • Familiar Windows Calculator layout on other systems
  • Scientific and Programmer modes
  • Results update as you type
  • Up to 50 digits of precision
  • Initial load can be slow
  • Built mainly as a framework showcase
  • Latest advertised release is the long-standing 0.12
  • Keyboard-centred design may not suit button-only users
Downloadable app, Web application Downloadable app
Open source Open source
License: Apache-2.0 License: GPL-2.0-or-later
No account needed No account needed
Not stated if it works offline Works offline

Checked October 1, 2026

Checked October 2, 2026

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