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Rom Patcher JS vs UniPatcher: catalog facts
Rom Patcher JS	UniPatcher

Best for: Applies and creates ROM patches in the browser, with nothing uploaded	Best for: Android emulator users applying translation or hack patches to ROMs
Free Free and open source under the MIT licence.	Free Free and open source under the GPL-3.0-or-later licence.
Web	Android
Everything runs locally in the browser; no file is uploaded Covers every common patch format, and can create patches too	Patches ROMs directly on the phone Useful for applying fan translations and hacks
Browser memory limits apply to very large disc images	You need to supply both the ROM and the patch yourself Android only
Web application	Downloadable app
Open source	Open source
License: MIT	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 Sources for Rom Patcher JS marcrobledo.com/RomPatcher.js github.com/marcrobledo/RomPatcher.js Catalog checked September 22, 2026	Official website Full listing and sources Sources for UniPatcher github.com/btimofeev/UniPatcher f-droid.org/packages/org.emunix.unipatcher Catalog checked October 2, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.