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RPN vs JRPN 15C: catalog facts
RPN	JRPN 15C
Free Free and open source under GPL-3.0-or-later.	Free Free of charge.
Android	Windows, macOS, Linux, Android, iOS, Web
Stack-based Reverse Polish Notation Fixed-point decimal arithmetic	Aims to match the HP 15C's appearance and behavior Runs in a browser and on several desktop and mobile platforms
Does not include scientific functions, unit or base conversions, programmability, or memory registers	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
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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