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JRPN 15C vs x11-calc: catalog facts
JRPN 15C	x11-calc
Free Free of charge.	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux, Android, iOS, Web	Linux
Aims to match the HP 15C's appearance and behavior Runs in a browser and on several desktop and mobile platforms	Faithful simulation of many HP calculator models Runs original firmware for accurate behaviour
The web version is described as less well supported than desktop and mobile	Niche audience familiar with HP calculators Linux-focused distribution
Downloadable app, Web application	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: GPL-3.0-or-later
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 1, 2026

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