PSP.js

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Freedom report

One barScore 5.4

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

PSP.js is ranked #8 of 9 in PSP emulators on Freedom251. It runs on Web.

Compared on PSP emulators

Supported platforms: Web

Best PSP.js alternatives

See all 8

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The record

Product: PSP.js is a work-in-progress PlayStation Portable emulator written in TypeScript that runs in a browser using high-level emulation.
No BIOS required: Its high-level emulation reimplements PSP system calls in TypeScript, so it does not require a BIOS ROM.
Game formats: It loads ISO and PBP games, including KIRK-encrypted EBOOTs.
Emulation: It runs the MIPS Allegrex CPU and VFPU and renders graphics through WebGL.
Audio and video: The project says it decodes ATRAC3+ audio and MPEG/PSMF video.
Saved data: Game data is saved in browser storage.
Compatibility status: The project says several commercial games boot to menus and render, and directs users to a per-game compatibility list.
Work in progress: The repository describes PSP.js as a work in progress.
Use: The README directs users to open the browser app, choose a game, and load an ISO or PBP; keyboard controls are configured in the app.
Browser requirement: The README says the graphics worker requires SharedArrayBuffer and that a plain static file server will not work.
Testing: The repository reports that its pspautotests CPU and kernel suite passes.
Documentation: The README says project documentation covers the user guide, architecture, and subsystem and HLE module references.
CPU and graphics: It runs the MIPS Allegrex CPU and VFPU and renders the PSP Graphics Engine using WebGL.
Development status: The project describes itself as a work in progress; several commercial games boot to menus and render.

Where it ranks on Freedom251

Best PSP Emulators in 2026#8 of 9

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Sources

github.com/mert574/psp-js· checked 4 Oct 2026