Atrahasis is unclaimed —

Atrahasis

API Client and Development Platform. Flexible by design.·atrahasis.dev

Atrahasis is a native desktop API client and development platform covering the full API lifecycle: designing OpenAPI specs visually, sending HTTP, GraphQL, WebSocket and SSE requests, chaining requests into automated flows, running load tests, and mocking servers. It is privacy-first, running entirely locally with no cloud sync, no telemetry, and no account required, and is built with Rust and Tauri. A companion 'atra' CLI brings the same engine to the terminal and CI/CD pipelines, and a built-in Git client lets teams version and share flows and specs.

What it's for

Designing OpenAPI specs visually with bi-directional syncSending HTTP, GraphQL, WebSocket, and SSE requestsChaining requests into automated flow workflowsValidating API responses with visual assertionsLoad and stress testing APIs with live percentile metricsMocking HTTP servers with conditional rulesRunning API tests and CI/CD checks via the atra CLIVersioning and sharing API specs/flows via built-in Git

Features 19

atra CLI for terminal-based HTTP requests and CI/CD integration
Built-in Git client (stage, commit, branch, merge, stash, push, pull)
Flow Runner for chaining requests into automated workflows with variable extraction
Full HTTP client (GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS)
GraphQL client with schema introspection and visual query builder
HTTP/1.1, HTTP/2, and HTTP/3 (QUIC) with automatic protocol negotiation
Load testing with five traffic shapes and live percentile metrics
Mock server with conditional rules, delays, and live reload
OpenAPI visual designer with bi-directional spec sync
Per-phase request timing breakdown (DNS, TCP, TLS, TTFB, download)
Random/dynamic variable generation for test data (UUIDs, emails, dates)
Reporting export as PDF, HTML, or OpenTelemetry JSON
Response viewer with Body, Headers, Cookies, Detail, and Contract tabs
Scripting API (at.*) for pre/post request and flow scripts
Secret management
Server-Sent Events streaming with auto-reconnect and Last-Event-ID resume
URL autocomplete from request history
Visual, point-and-click assertion builder for status codes, headers, and JSON paths
WebSocket client with text/binary/ping/pong/close frame support

At a glance

free tierfree trial

TypeDesktop app

DeploymentInstalled (local)

PlatformsWindows, macOS

Forsolo developers, organizations/engineering teams

Integrations

HashiCorp VaultGitOpenTelemetry

Resources

Changelog

Pricing

Prices shown exclude tax. Individual plan can be billed monthly or annually; Enterprise is annual-only billing. No usage limits stated on paid plans.

Standard Edition (Free)Free

Complete local-first API client and development platform, Generous free limits, No account required

Free forever with limited features

Individual$12/mo · billed annually

Billed annually; monthly or annual billing cycle available; excl. tax; payment via credit card; community support.

1 personal license

Enterprise$39/user/mo · billed annually

Annual billing only; excl. tax; payment via credit card or wire transfer; contact sales option available.

5+ assignable seats, annual billing only

Save 20% on the Individual plan when billed annually.