GoNES vs Nestopia

GoNES is a free, open-source NES emulator written in Go. It runs on Windows, macOS, Linux and web browsers; the browser version compiles to WebAssembly, and the project links to a hosted instance. At startup, the app opens a file picker for selecting a .nes ROM, and it can also be launched from a terminal with a ROM file argument. The project lists support for mappers 0, 1, 2, 3, 4, 7, 69 and 71, which it says cover 84.34% of official NES games. Keyboard controls for two players are configurable. Save-state, load-state and undo bindings are listed. GoNES creates a configuration file on first run, with its location documented for each desktop platform. Release downloads are provided, and macOS installation through Homebrew is documented. Source installation is also documented. Building requires OpenGL development libraries because rendering uses Ebitengine. The project says its GUI renders, but menu options still need to be added.

Nestopia has no write-up on Specifiction yet; its figures are above.