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

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

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