Nes2x
Nes2x: A focused C++ emulator core for developers validating NES CPU compatibility. Ranked #23 of 26 in NES Emulators by our editors (7.0/10); pricing: Open source; best for developers testing core CPU compatibility.
At a glance
- Editor score7.0 / 10
- PricingOpen source
- Best forDevelopers testing core CPU compatibility
- Paid fromFree
- Facts checked20 Sep 2026
Where it wins
- Supports Nintendo Entertainment System and Famicom emulation
- Implements official and unofficial CPU instructions
- Passes nestest without PPU checks
Where it doesn't
- Graphics, input, and audio are not yet supported
- Save states, save files, and controller mapping remain TODO
- Build and usage documentation remain TODO
Our verdict on Nes2x
Nes2x is an open-source C++ emulator for Nintendo Entertainment System and Famicom cartridges. It is intended to run legally transferred NES cartridges on a PC, with its current scope centered on emulation fundamentals rather than a complete user-facing application. Developers examining CPU compatibility will find support for official and unofficial CPU instructions, plus a published result of passing nestest without PPU checks.
The project’s strongest angle is its CPU-focused implementation. Support for both official and unofficial instructions gives compatibility work a broader target than an emulator limited to documented instruction behavior. The C++ implementation also makes the project relevant to developers reviewing or extending native emulator code. Its nestest result provides a concrete signal for CPU-oriented validation, while the lack of PPU checks keeps that result appropriately focused on the processor portion of emulation.
Nes2x is not yet a practical choice for playing NES or Famicom games. Graphics, input, and audio are explicitly not supported, and save states, save files, controller mapping, usage guidance, and build documentation remain TODO. Those limitations make the project better suited to developers studying or testing the emulator core than to players seeking a finished desktop experience. Choose Nes2x when CPU instruction coverage and a C++ codebase are the priority; choose a more complete emulator when video, controls, sound, saves, or documented setup are required.
Your product? Our editors can test Nes2x in depth and publish a review, labelled as paid · from $149/mo →
Nes2x pricing
Nes2x fact sheet
| Free plan | Not verified |
|---|---|
| Paid from | Free |
| Supported platforms | Not verified |
| Save states | Not verified |
| Rewind | Not verified |
| Netplay | Not verified |
| Shader support | Not verified |
| Cheat support | Not verified |
| Pricing | Open source |
| Website | github.com |
| Facts checked | 20 Sep 2026 |
Alternatives to Nes2x
- KuroganeNESA feature-rich, open-source NES emulator delivered as a self-contained HTML file.9.4
- DendyA feature-rich, open-source NES emulator for desktop, browser, and multiplayer play.9.2
- puNESA feature-rich, free NES emulator for Windows and Linux desktops.9.1
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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