All API Testing, all in one place

API Testing
At Scale.

The AI-first, Git-native CLI for building, testing, and mocking APIs. Edit in YAML, run in VS Code, and automate with confidence.

playbook.yaml

requests:
  create-user:
    method: POST
    url: /api/users
    body: |
      {
        "name": "Alice",
        "role": "admin"
      }
    expect:
      status: 201
      body:
        $.id: exists
  
  get-user:
    method: GET
    url: /api/users/alice
    expect:
      status: 200

Git-Native Workflow

Treat Tests Like Code.

Stop clicking through proprietary UIs. Quadrastack playbooks are pure YAML. Commit them to Git, review changes in Pull Requests, and manage versioning alongside your application code.

Zero information loss in diffs
Conflict-free merging
Run in CI/CD pipelines

git diff playbook.yaml

@@ -12,4 +12,4 @@
 requests:
   checkout-flow:
     method: POST
-    url: /api/v1/checkout
+    url: /api/v2/checkout
     body:
       items:
         - id: "prod_123"

AI Prompt

> Generate a mock server for a payment gateway that fails 20% of the time.

mockServer:
  payment-gw:
    listen: ":8080"
mocks:
  charge:
    match: { method: POST }
    respond:
      - { status: 200, weight: 80 }
      - { status: 500, weight: 20 }

AI-First Architecture

Speaks the Language of LLMs.

We designed our schema to be context-friendly for AI agents. Paste our public schema into ChatGPT or Claude, and generate valid, complex test scenarios in seconds—that actually work.

Strict JSON Schema validation
Token-efficient syntax
Automated edge-case generation

And so much more.

Everything you need to ship confident APIs, packed into a single binary.

Unified Tooling

Stop stitching together curl, JMeter, and Mocks. Get your HTTP Client, Mock Server, and Load Runner in one cohesive CLI.

VS Code Native

Run requests, debug failures, and manage mock servers directly from your editor. No context switching required.

Privacy First

Offline-first by design. No forced cloud logins. No telemetry. Your API tokens and data never leave your machine.

Multi-Env Profiles

Switch between `dev`, `staging`, and `prod` instantly. Profile-aware variables make configuration management a breeze.

Start Testing in 5 Minutes

Download the binary, write a simple YAML file, and experience the future of API testing. No account needed.

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API Testing At Scale.