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Atrahasis

API Client and Development Platform.
Flexible by design.

Why Atrahasis?

The full API lifecycle, from design to production.

Lifecycle: Every request takes the same road to production with known steps like Design, Mock, Test, Scenarios, Load Test, CI/CD. That's the general API lifecycle.

Atrahasis is an API Client and Development Platform that provides solutions for each step.

Lifecycle
Atrahasis
Design
→
OpenAPI
Mock
→
Mock Server
Test
→
Assertions
Scenarios
→
Flow Runner
Load Test
→
Load Test
CI/CD
→
atra CLI

Portability: Atrahasis provides solutions that are independent, yet work seamlessly together. Nothing is strict. Use one solution or several together — or alongside tools you already have. This is the Atrahasis Code: Flexibility.

Fragments

Platform

Atrahasis

API Client and Development Platform. Everything a modern API workflow needs — Clients, Design, Flows, Load Tests, Mocks, Git — bundled into one native desktop app.

  • HTTP, GraphQL, WebSocket, and SSE clients in one app
  • Local-first — no cloud, no account, no telemetry
  • Git integration and Secret management
Atrahasis — API Client and Development Platform
Flow Runner - Automated API Workflows
Workflow

Flow Runner

Chain multiple HTTP requests into automated workflows. Extract variables, add assertions, configure retries, and run iterations — all from a visual step-by-step interface.

  • Variable extraction & step chaining
  • Assertions, retry logic, iterations
  • Import steps from OpenAPI Projects
OpenAPI

Visual API Designer

Design, edit, and test your APIs in one place. Switch between visual editor and JSON/YAML. Hit "Try it out" to execute requests directly from your spec.

  • Visual + Code editor in split view
  • Import from URL, file, or clipboard
  • Schemas, security schemes, webhooks
OpenAPI Visual Designer
Visual Assertions
Testing

Visual Assertions

Validate your responses without writing scripts. Status codes, response times, headers, JSON paths, all with a visual builder. See what passes, what fails, and why.

  • Point-and-click test builder
  • Regex & pattern matching
  • Clear pass/fail diagnostics
Performance

Load Test

Put your APIs under real pressure. Five built-in traffic shapes, live percentile metrics, and threshold gates that turn every run into a clean pass/fail verdict.

  • Load, stress, spike, soak, and custom profiles
  • Thresholds on latency percentiles, error rate, throughput
  • Run comparison with per-step deltas
Load Test Results
4 Client Types
HTTP, SSE, WebSocket, GraphQL
atra CLI
Terminal HTTP Client & CI/CD
Built-in Git
Share your flows and specs via Git
Resource Usage
Lightweight, fast desktop app