Your APIs have enough problems. Your spec editor shouldn't be one of them.

A visual OpenAPI editor with a flow builder, team workspaces, built-in API execution, and public spec hosting. Free, fast, and open source.

Start Editing — Free View on GitHub

The tools you're using weren't built for this

Most API editors were designed for a different era. You deserve better.

Swagger Editor is painfully slow

YAML-only editing, constant lag on large specs, no collaboration, and a UI that hasn't changed in years.

Postman tries to do everything

API testing, monitoring, mock servers, documentation... Postman does it all, except edit OpenAPI specs well.

Your specs are trapped in localStorage

One browser tab, one machine. No backup, no sharing, no collaboration. Clear your cache and it's gone.

What OpenAPI Studio does differently

Purpose-built for OpenAPI spec editing. Every feature earns its place.

Core Feature

Visual Flow Builder

Your API paths, visualized as an interactive node graph. Each path segment becomes a node, each endpoint a leaf — the structure of your API, instantly clear.

  • Interactive path tree from your OpenAPI paths
  • Zoom, pan, and minimap navigation
  • 4 layout algorithms: layered, stress, box, compact
  • Click any endpoint to open the editor
  • Custom segment and endpoint nodes

Flow Builder

Flow Builder showing API path tree

Full Coverage

Unified Spec Editor

Edit every part of your OpenAPI spec through intuitive forms. No more hand-editing YAML and hoping the indentation is right.

  • Edit info, servers, parameters, request bodies, responses
  • Security scheme configuration
  • Tags and component management
  • Raw JSON/YAML mode with Monaco Editor
  • Auto-save with undo/redo

Spec Editor

Spec Editor with form-based editing

No CORS

Built-in API Execution

Test your endpoints right from the editor. Our server-side proxy means no CORS headaches — just click and run.

  • Server-side proxy eliminates CORS issues
  • Response viewer with syntax highlighting
  • Execution history (7-day free, 30-day pro)
  • Pin and save important responses
  • Play button directly in flow nodes

API Executor

API Executor with response viewer

Collaboration

Team Workspaces

Work together on API specs with role-based access control. Invite your team and manage who can edit, view, or administer.

  • Owner, Editor, Viewer roles
  • Email-based invitations
  • Role-based access control (RBAC)
  • Credential vault for shared secrets
  • Multiple workspaces per account

Workspaces

Team workspace with member management

One Click

Public Spec Hotlinks

Share your specs with a single URL. Edge-cached via Cloudflare KV for instant access from anywhere in the world.

  • Serve specs as JSON or YAML
  • Edge-cached via Cloudflare KV
  • Custom slug URLs
  • Private specs with access tokens
  • CORS-enabled for external tools

Public Hotlinks

Public hotlink URL configuration

< 2s

Load time

$0/mo

Free tier

0+

API endpoints

99.9%

Uptime target

How it works

Three steps to better API specs

1

Sign in with GitHub

One-click OAuth. No credit card, no setup wizard, no onboarding emails.

2

Create or import a spec

Start fresh, upload a file, paste a URL, or import from Postman. We handle the conversion.

3

Edit, test, and share

Use the flow builder to navigate, the editor to modify, the executor to test, and hotlinks to share.

Honest comparison

No FUD, no asterisks. Here's how we actually stack up.

Feature OpenAPI Studio Swagger Editor Stoplight Postman
Visual flow builder ~
Form-based editing
Raw JSON/YAML editor ~
Built-in API execution
Team collaboration
Public spec hotlinks
Import & conversion ~
Dark mode
Self-hostable
Price $0 $0 $39+/mo $14+/mo

Your API specs won't design themselves.

Stop fighting your tools. Start building better APIs with a visual editor that actually gets out of your way.

Start Editing — Free