Coffee GB vs SkyEmu

Coffee GB is a desktop emulator for the original Game Boy and Game Boy Color, with support for Super Game Boy features. It runs on Windows, macOS, Linux, and Android, and accepts .gb, .gbc, and .rom files, including games inside ZIP and 7z archives. ROM files are not included. For saving and reviewing play, it offers ten slots, named save states with previews, autosave and resume, screenshots, input recordings, and rewind. Rollback netplay supports link-cable games and synchronized infrared communication. Keyboard and controller input are supported, with separate controls for up to four players in compatible Super Game Boy games. Cartridge support includes real-time clocks, rumble, tilt, Game Boy Camera, and Game Boy Printer. Cheats include Game Genie and GameShark, with a searchable libretro database. The project reports 5,858 automated verdicts passing across 17 test suite families. Coffee GB is free and distributed under the MIT License. Netplay uses a direct, unencrypted TCP connection; the project advises using trusted people and networks. On macOS, controllers require compatible system SDL2, though keyboard input and emulation work without it.

SkyEmu is a free emulator for Game Boy, Game Boy Color, Game Boy Advance, and Nintendo DS systems. It runs on Android, iOS, Linux, macOS, web, and Windows, and can load ROMs compressed in ZIP archives. Graphics options include upscaling shaders, color correction, and screen ghosting. Controls include game controllers, rumble, configurable keybinds, and mobile on-screen controls. Four persistent save-state slots include screenshot previews. A REST-like API supports asynchronous scripting and automation, and listed integrations include Retro Achievements, a RetroArch/libretro core, and Google Drive save-state sync. The web app runs locally using WebAssembly and JavaScript, keeping files on the user's machine; its service worker enables offline use on more platforms. The project describes its focus as preserving these systems for future generations while providing a good user experience. It says Game Boy Advance emulation is significantly more accurate than its Game Boy and Game Boy Color emulation. Many Nintendo DS games still have mild graphics and audio issues, and DS emulation is beta quality.