A modern alternative to Swagger Editor
Swagger Editor defined the category. OASForge keeps what made it great — code on the left, live rendered docs on the right — and rebuilds the rest for how specs are written today.
Side by side
| Capability | OASForge | Swagger Editor |
|---|---|---|
| Dark theme | Native, four palettes | No |
| Works fully offline | Yes — PWA and a single-file build | Partially |
| “Try it out” without a backend | Yes — built-in stateful mock server | No |
| Quick fixes on validation issues | Yes, one click | No |
| Postman collection import | Yes, automatic | No |
| Insert menu for OpenAPI structure | Yes | No |
| Version history with diff | Yes, in local storage | No |
| OpenAPI 3.2 awareness | Yes | Depends on version |
| Account required | Never | No |
The mock server changes how you demo
The default server in the preview is an in-browser mock: POST really creates
records (kept in memory), GET lists them back, PUT/PATCH/DELETE
update and remove. Endpoints without stored data answer with schema-derived examples. You can demo
a realistic API flow from a laptop with no network at all.
Honest limits
OASForge is a client-side workbench: it does not generate server stubs or client SDKs the way swagger-codegen integrations do, and very large multi-file specs must be bundled into one document first. For writing, validating, mocking and sharing a spec, it does more — with nothing to install.
No signup, no install — the editor runs entirely in your browser.
Open the OASForge editor