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x11-calcJRPN 15C
Free

Free and open source under the GPL-3.0-or-later licence.

 Free

Free of charge.

Linux Windows, macOS, Linux, Android, iOS, Web
  • Faithful simulation of many HP calculator models
  • Runs original firmware for accurate behaviour
  • Aims to match the HP 15C's appearance and behavior
  • Runs in a browser and on several desktop and mobile platforms
  • Niche audience familiar with HP calculators
  • Linux-focused distribution
  • The web version is described as less well supported than desktop and mobile
Downloadable app Downloadable app, Web application
Open source Open source
License: GPL-3.0-or-later License: GPL-3.0-only
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked October 1, 2026

Checked October 8, 2026

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