PSP.js
PSP.js: A substantial open-source PSP emulation project for web-based development. Ranked #6 of 9 in PSP Emulators by our editors (6.9/10); pricing: Open source; best for web-based PSP emulation development.
At a glance
- Editor score6.9 / 10
- PricingOpen source
- Best forWeb-based PSP emulation development
- Paid fromNone
- Supported platformsweb
- Facts checked20 Sep 2026
Where it wins
- Loads ISO and PBP images, including KIRK-encrypted EBOOT decryption
- Combines Allegrex CPU, VFPU, WebGL, and software rendering
- Includes savedata, save states, video, audio, and headless diagnostics
Where it doesn't
- The project is explicitly marked as work in progress
- Its documented platform support is limited to the web
- Local setup and debugging tools suit technically inclined users more than casual players
Our verdict on PSP.js
PSP.js is an open-source PSP emulator written in TypeScript for running in a web browser. It is aimed at developers and technically inclined users who want to work with PSP emulation in a web environment. The project uses high-level emulation without a PSP BIOS ROM, loads ISO and PBP game images, and includes keyboard control mapping and a fullscreen interface. Its supported platform is the web, making it a focused option rather than a broad multi-platform emulator product.
The emulation feature set is substantial for a browser-based project. PSP.js covers the Allegrex CPU and VFPU, KIRK-encrypted EBOOT decryption, WebGL rendering, and a software rasterizer. It also supports ATRAC3+ audio decoding and MPEG/PSMF video playback through WebCodecs. Browser-persisted savedata and exported save states extend the project beyond basic execution, while headless Node.js diagnostics provide a path for development and debugging outside the interactive browser interface.
The main qualification is project maturity and audience. PSP.js is explicitly marked as work in progress, and its local setup instructions, debugging tools, and headless diagnostics point toward development-oriented use rather than a finished consumer application. The documented platform support is web, and the documentation does not identify OpenGL, Vulkan, DirectX, or Metal backends. Choose PSP.js if browser-based PSP emulation, TypeScript development, or emulator diagnostics are the priority. Those seeking a mature, broadly platformed emulator or documented native graphics backends should look elsewhere.
PSP.js pricing
PSP.js fact sheet
| Free plan | Not verified |
|---|---|
| Paid from | None |
| Supported platforms | web |
| Graphics backends | Not verified |
| Network multiplayer | Not verified |
| Texture replacement | Not verified |
| Homebrew support | Not verified |
| Cheat support | Not verified |
| Deployment | Cloud, Self-hosted |
| Platforms | Web |
| Support | Docs |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Open source |
| Website | github.com |
| Facts checked | 20 Sep 2026 |
Alternatives to PSP.js
- JPCSPA feature-rich desktop PSP emulator for games, homebrew, modding, and debugging.9.0
- PPSSPPA free, cross-platform PSP emulator with upscaling, saves, multiplayer, and input flexibility.8.0
- ScePSPA feature-rich alpha emulator for desktop users who value graphics tuning and cheats.7.7
PSP.js vs the competition
- PSP.js vs JPCSP
- PSP.js vs PPSSPP
- PSP.js vs ScePSP
- PSP.js vs N-EMU
- PSP.js vs Manic EMU
- PSP.js vs PSP Emulator Web
Compare PSP.js with any tool side by side →
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Guides on PSP emulators
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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026
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