KuroganeNES vs Nestalgia

KuroganeNES is a free NES and Famicom Disk System emulator that runs from a self-contained HTML file in modern web browsers. Single-player setup involves opening nes.html and loading a ROM, with no installer, plugin, build step, or server. The project describes cycle-accurate emulation modeled on the NES-001 and verified against named test suites across four CPU/PPU clock alignments. It supports 561 mappers and uses CRC32 ROM fingerprints to choose mapper, mirroring, timing, and peripheral settings for thousands of known games. Video and audio include NTSC and PAL timing, composite-video modeling, and expansion audio for listed chips. Features include save states, rewind, fast-forward, local multiplayer, and online multiplayer for two or four players. Supported peripherals include the Zapper, Power Pad, keyboards, tablet, and microphone. Tools include cheats, ROM patching, an NSF player, TAS studio, and CPU/PPU debugging. Remote multiplayer needs Node.js, a TLS certificate, and port 8888 reachable by default.

Nestalgia is a work-in-progress emulator for NES and Famicom systems, built in Kotlin for Linux, macOS and Windows. It also emulates Famicom Disk System, Dendy, Vs. System, NSF and NSFe, and lists support for 305 mappers. The emulator includes save states, battery saves, overclocking and cheat codes, along with fullscreen display and screenshots. Audio, video, controller and emulation settings are configurable. More than 20 controllers are supported, including the NES Controller, Zapper, Power Pad and Four Score. The project lists passing CPU, video, audio, mapper and input accuracy tests. Windows, Linux and Mac downloads require Java 21 or newer. The project is free and open source under GPL-3.0, with no plan limits stated. Android is listed with an uncertain “Coming soon...or not :(” status. Developers can add its core library through JitPack using Gradle instructions. Nestalgia implements the emulator but does not include debugging tools.