BPS Super Mario Bros. 2 Patcher vs UniPatcher

BPS Super Mario Bros. 2 Patcher is a free web page for applying a BPS patch to a Super Mario Bros. 2 ROM. It provides separate upload controls for an SMB2 ROM and a BPS patch, then an Apply patch button. The page validates both files and shows invalid-file messages when they are rejected. It supports only the NTSC version; the page says an invalid ROM may be a bad dump or the wrong region. During validation, the code checks iNES 1.0 and iNES 2.0 headers and can swap them as needed. It recognizes ROM and patch checksums for revisions 0 and A, and can apply a revision conversion patch. After patching, the script saves a .nes file named from the patch filename. The project links to GitHub source code containing BPS handling, ROM and hash code, revision patches, scripts and styles. The page credits Marc Robledo for Rom patcher JS.

UniPatcher is a free Android app for applying patches to ROMs from older console games, rather than native Android games. Users select a ROM, choose a patch, specify an output file, and start the operation with the round button through the Files app or another file manager. Supported formats include IPS, IPS32, UPS, BPS, APS for GBA and N64, PPF, DPS, EBP, and XDelta3. The app can create XDelta patches, repair checksums in SMD or Genesis ROMs, and remove SMC headers from SNES ROMs. Compressed games and patches in ZIP, RAR, or 7z format must be unzipped first. The project is licensed under GPL version 3. Its privacy policy says the app does not collect or transmit personally identifiable or location data and does not share personal information with advertisers, vendors, or analytics providers. Google Play reports no data collected or shared with third parties. Boris Timofeev is listed as developer. Bug reports use GitHub Issues, while questions and feature suggestions use GitHub Discussions; translation contributions go through Weblate.