js-dos

Web · Linux · Self-hosted · API

Freedom report

Two barsScore 6.5

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely2 of 6 device platforms
DocumentedPlans, terms and facts published

js-dos is ranked #6 of 26 in MS-DOS emulators on Freedom251. It runs on API, Linux, Self-hosted, Web. There is a free plan.

js-dos plans and pricing

All plans

js-dos Free Core features are stated to be free; subscription activates cloud saves and enables write access to sockdrive drives js-dos.com · 5 Oct 2026

Cloud saves subscription Not published Activates cloud saves; subscribed users can write to sockdrive drives js-dos.com · 5 Oct 2026

Compared on MS-DOS emulators

Free plan: Yes
Supported host platforms: web browser, Node.js, mobile browsers
DOS target versions: ms-dos
Disk image formats: IMG, QCOW2
Source available: Yes

Best js-dos alternatives

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Two bars DOS Browser Free tier No. 1Free6.7 Two bars DosKit Free tier No. 2Free6.7 Two bars DOSBox Free tier No. 3Free6.5 Two bars DOSBox Pure Free tier No. 4Free6.5 Two bars DOSBox Staging Free tier No. 5Free6.5 One bar DOS Wasm X Free tier No. 7Free6.4

The record

Purpose: js-dos provides a JavaScript API and player to run DOS and Windows 9x programs in a browser or Node.
Emulation: It supports DOSBox and DOSBox-X backends, including Windows 95/98 system images through DOSBox-X.
Graphics: The site describes WebGL-backed accelerated 3Dfx rendering as a unique capability.
Networking: Its browser IPX networking uses WebRTC-NET and supports IPX server creation, peer and alias connections, and shared network instances.
Persistence: Game progress is stored locally in the browser by default, and the site says browser storage may be wiped; cloud saves can be enabled with a secret key.
Storage integration: The player supports custom save storage through filesystem change hooks, and local persistence is based on OPFS.
Sockdrive: All users can read sockdrive storage, while subscribers get write access to save progress and install games; disk cloning and unlimited disks are listed features.
Integration: js-dos can be added to a webpage from its CDN, installed from npm, or downloaded from GitHub releases.
Hosting: A basic player needs static website hosting and does not require a backend; the page must be served over HTTP rather than opened with the file protocol.
Runtime: The product supports execution in browsers and Node, works in a worker or render thread, and offers WebAssembly and pure JavaScript versions.
Mobile status: The overview labels mobile support as work in progress for v8 and production for v7.
Self-hosting: The site documents running a custom sockdrive server locally or globally on Linux distributions such as Ubuntu.
Deployment limitation: The documented sockdrive service has one active deployment in Europe, and the site says performance can vary by region.
Security detail: The site warns that a shared secret key grants direct access to the account's disk drives and saves, and concurrent writing can quickly corrupt them.
Price from: Free

Where it ranks on Freedom251

Best MS-DOS Emulators in 2026#6 of 26

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Sources

js-dos.com/overview.html· checked 5 Oct 2026
js-dos.com/cloud-overview.html· checked 5 Oct 2026
js-dos.com/sockdrive.html· checked 5 Oct 2026
js-dos.com/releases.html· checked 5 Oct 2026
js-dos.com/dos-api.html· checked 5 Oct 2026
js-dos.com/deployment.html· checked 5 Oct 2026
js-dos.com/subscription.html· checked 5 Oct 2026
js-dos.com/about/· checked 5 Oct 2026