NES Emulator + 6502 Studio

Web · Linux · Self-hosted

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Freedom report

One barScore 5.4

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely2 of 6 device platforms
DocumentedPlans, terms and facts published

NES Emulator + 6502 Studio is ranked #13 of 26 in NES emulators on Freedom251. It runs on Linux, Self-hosted, Web.

Compared on NES emulators

Supported platforms: Web browser; native builds via C++ and CMake

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The record

Purpose: NES Emulator + 6502 Studio is a C++ NES emulator compiled to WebAssembly with a browser debugger called NES Studio.
Debugger: NES Studio includes stepping, running, breakpoints, live disassembly, a memory editor, CPU and PPU state, pattern, nametable and OAM viewers, and full-screen Play mode.
CPU: The 6502 core implements all 151 official opcodes and documented illegal opcodes, passes nestest and blargg instr_test, and matches the nestest golden log cycle for cycle.
Graphics and sound: The PPU supports backgrounds, sprites, DMA, scrolling and four mirroring modes; the APU provides two pulse channels, triangle and noise through WebAudio.
Cartridge support: The emulator supports NROM, MMC1, UxROM, CNROM and MMC3 mappers.
Game compatibility: The project reports Super Mario Bros. 1-1 as fully playable and Super Mario Bros. 3 as booting with its attract demo playing.
Known limitation: The PPU renders one scanline at a time, so the blargg ppu_vbl_nmi timing ROM does not pass; the project says dot-based PPU timing is a future accuracy task.
Headless and deterministic use: A C-ABI shared library exposes independent NES instances with deterministic stepping, and the project includes a Python package with a Gymnasium-style Super Mario Bros environment.
Agent integration: NES Studio can replay .nesmovie recordings and can show live agent play through a Python streaming server; the live-agent button is hidden in production builds unless a backend URL is configured.
Setup: The project documents Docker and front-end setup using pnpm and Node 20+, plus a native build requiring a C++17 compiler, CMake 3.14+ and GoogleTest.
Testing: The project reports 32 native gtest tests and 211 web Vitest tests, with conformance test ROMs fetched on demand and run in CI.
License: The project is licensed under GPL v3.
Security and support: The opened project page provides no security or compliance claims and no dedicated support terms.
Intended users: The project describes its headless library, Python environment and live-agent workflow as suitable for scripting, training agents, development and research.

Where it ranks on Freedom251

Best NES Emulators in 2026#13 of 26

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Sources

github.com/MaxwellKnight/nes-emulator· checked 4 Oct 2026