The API Platform
That Makes You Faster

Build, test, and automate APIs with visual workflows, AI-powered testing, and request chaining. Import your Postman collections and start shipping in minutes.

flow — API Platform
GETList Users
POSTCreate User
GET
{{base_url}}/api/users
200 OK—42ms—1.2 KB
BodyHeadersCookies
1{2  "status": "success",3  "data": {4    "users": [5      {6        "id": 1,7        "name": "Sarah Chen",8        "role": "admin"9      },10      {11        "id": 2,12        "name": "Alex Rivera",13        "role": "developer"14      }15    ],16    "total": 42,17    "page": 118  }19}
11Node types in workflow builder
4Import/export formats supported
30+Achievements & challenges
0Vendor lock-in

Everything You Need

From quick API calls to complex automation pipelines

Request Tabs

Open multiple requests in tabs with VS Code-style preview and pinning.

Request Chaining

Type {{ to autocomplete response values. Visual dependency graph shows how requests connect.

Command Palette

Press Ctrl+K to search collections, workflows, environments, and actions instantly.

Environments & Variables

Manage variables across dev, staging, and production. Dynamic resolution with {{variable}} syntax.

Mock Servers

Create mock endpoints with custom responses, delays, and rules. Test without a backend.

Team Collaboration

Share collections and workflows. Activity feeds, comments, role-based access, team invitations.

Performance Testing

Run load tests with configurable concurrency. Measure p50/p95/p99 latencies.

Import / Export

Import from Postman, OpenAPI, Insomnia, cURL. Export in any format. Zero lock-in.

Automation

Automate Anything with Visual Workflows

Design complex API automation with a drag-and-drop DAG editor. Chain requests, add conditions, loops, and transforms — then schedule them to run automatically.

Drag-and-drop 11 node types: request, transform, condition, loop, code, and more

Topological execution with automatic data passing between nodes

Schedule workflows with cron expressions

6 built-in templates to get started fast

Publish and share custom workflow templates with your team

POSTLogin
GETGet Users
IFHas Admin?

Yes

Continue flow…

No

Notify Admin
Response Body
1{2  "token": "eyJhbG...",3  "user": {4    "id": 42,5    "role": "admin"6  }7}
Add Assertion
Path: body.token
Value: "eyJhbG..."
Operator
= equals
Testing

Click. Assert. Ship with Confidence.

Stop writing assertions by hand. Click any value in a response to create a test instantly. The visual builder makes API testing as easy as pointing and clicking.

Click any value in a response to create an assertion instantly

Visual comparator picker: equals, contains, regex, exists, type checks

Path autocomplete from actual response data

Green/red pass/fail indicators on each assertion row

AI-suggested assertions analyze your responses automatically

AI

AI That Understands Your APIs

Describe what you need in plain English and let AI generate the requests. Get intelligent assertion suggestions and response explanations — all powered by Claude.

Describe an API in plain English — AI generates the requests

Paste an OpenAPI spec or docs URL for instant request generation

AI suggests assertions based on your response structure

One-click response explanations in plain English

Bring your own Anthropic API key — your data, your control

AI Generate
"Generate CRUD endpoints for a user management API with auth..."
POST/api/users
GET/api/users
GET/api/users/:id
PUT/api/users/:id
DELETE/api/users/:id
FAQ

Questions, answered.

Everything you need to know before you start building.

What is Arythmatic Flow?+
Arythmatic Flow is an API platform for building, testing, and automating APIs with visual workflows, AI-powered testing, and request chaining.
Can I import from Postman?+
Yes. Import your Postman collections, OpenAPI specs, Insomnia workspaces, or cURL commands in one click.
Does Flow support team collaboration?+
Yes. Share collections and workflows with your team. Activity feeds, comments, role-based access, and team invitations are built in.
Is there AI integration?+
Yes. Flow integrates with Claude to generate API requests from plain English, suggest assertions, and explain responses.

Start Building Better APIs Today

Free to use. Import your Postman collections in one click.

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