BlastEm vs Retropa

BlastEm is a free, open-source emulator for Sega's 16-bit and 8-bit consoles. It supports Genesis/Mega Drive, Sega CD, 32X, Master System, Game Gear, SG-1000, SC-3000, Sega Pico, and Yamaha Copera. Downloads are listed for Linux, macOS, and Windows, with an experimental web version. Gameplay features include save states, cartridge save RAM and EEPROM support, turbo and slow modes, controller input, and VGM logging. Its integrated debugger can inspect and modify state, set conditional breakpoints, run scripts, and show visual VDP tools. Developers can use the GDB remote debug protocol for source-level debugging of SGDK and other C or C++ projects. The maker describes it as fast enough for older PCs and accurate enough for demanding demos. Most Sega CD and 32X games are playable, but compatibility is not perfect. Yamaha Copera emulation is incomplete: games generally lack music, though Copera-specific ADPCM samples play. The listed macOS download is x86-64 and not notarized; the page directs ARM users to Homebrew.

Retropa is an emulator for handheld and arcade games on iPhone and iPad, with Mac listed among its supported platforms. It covers 14 handheld and console systems plus arcade families; listed systems include GBA, Nintendo DS, NES, Super NES, Genesis, WonderSwan, Neo Geo Pocket, and Master System. The free plan costs nothing and includes handheld and console systems, imports, controller templates, Delta skin import, save states, and rewind. Games and BIOS files are not supplied, so users import content they are entitled to use through Files, AirDrop, a browser, a local Wi-Fi Portal, or the Homebrew catalog. Compatible external controllers and ready-made templates are supported. Retropa Plus adds arcade families, premium skins, console mode, advanced save workflows, adaptive touch controls with five styles, and 64 listed display filters. Saves can be backed up and restored with iCloud Drive. Game files stay on the device, and no account is needed to play. iPhone and iPad require iOS 18 or later.