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JRPN 15C vs RPN: catalog facts
JRPN 15C	RPN
Free Free of charge.	Free Free and open source under GPL-3.0-or-later.
Windows, macOS, Linux, Android, iOS, Web	Android
Aims to match the HP 15C's appearance and behavior Runs in a browser and on several desktop and mobile platforms	Stack-based Reverse Polish Notation Fixed-point decimal arithmetic
The web version is described as less well supported than desktop and mobile	Does not include scientific functions, unit or base conversions, programmability, or memory registers
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	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.