SiteName

Free, open source API testing app – an alternative to Postman that supports REST, GraphQL, WebSockets, with AI-powered assistance

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sparrowapp.dev

Verified API available Free tier

Quick facts
What is it	Free, open source API testing app – an alternative to Postman that supports REST, GraphQL, WebSockets, with AI-powered assistance
Pricing	Freemium — from $9.99/mo
Free tier	Yes
Platform	Web Application
API	Yes
Best for	testing and debugging REST and GraphQL endpoints, automating multi-step API test flows
Domain registered	2023

Data updated Aug. 1, 2026

What does SiteName do?

Sparrow is a free, open source API testing tool that runs as a desktop app or in your browser. It lets you send requests to REST, GraphQL, WebSocket, and Socket.IO endpoints, organize them into collections, and run multi-step test flows. You can collaborate with your team through shared workspaces, making it a practical alternative to Postman for modern API development.

What makes Sparrow interesting is its built-in AI assistance. The tool can generate mock data, suggest code snippets, and help debug test cases with a single click. It also syncs with Git so your API definitions stay version-controlled, and you can self-host it for complete control over your data. No-code assertions and smart variable suggestions make testing faster, even for less experienced team members.

Developers and QA teams who need a lightweight, privacy-focused API client will get the most out of Sparrow. It works well for solo projects, small teams, and larger organizations that want to avoid vendor lock-in. Frequent updates and an active community keep the tool evolving without the usual enterprise bloat.

Non-AI Developer Tools — Other

#api testing#collaboration#graphql#open source#rest api#self-hosted#websocket

Key features

What makes it stand out

AI-powered mock data generation and code snippet suggestions

Multi-step test flows for automated endpoint validation

Real-time collaboration with organized workspaces

Self-hosted deployment for secure API testing

Git sync for automatic version tracking of API collections

Who is SiteName for?

Who benefits most from this tool

testing and debugging REST and GraphQL endpoints

automating multi-step API test flows

collaborating on API collections with team members

Pricing

Free tier available — start without a credit card

Community

Free

Up to 5 collaborators
3 workspaces for organizing API workflows
Unlimited collections for API testing
Mock Server for simulating API responses
Sparrow AI (50 requests per month)
Basic community support.

Standard

$9.99/month

Everything in Community, plus:

Unlimited collaborators & 5 workspaces
10 test flows per workspace with up to 30 APIs per flow
Selective test runs for better debugging
7-day test run history
Priority email support
Mock Data generation
AI Auto - completions
Supported models - Deepseek.

Professional

$19.99/month

Everything in Standard, plus:

Private hubs for secure API collaboration (up to 10 workspaces)
Active sync for seamless workflow integration
25 test flows per workspace
15-day test run history
AI-powered mock server
Sparrow Env Vault for secure environment variable management
SAML authentication for enhanced security

Enterprise

$49.99/month

Everything in Professional, plus:

Unlimited private hubs
Unlimited test flows with extended test run history (30 days)
Hub-level access management
SCIM for automated user provisioning
Bring your own vault for security compliance
Dedicated Customer Success Manager (CSM)
Service Level Agreement (SLA) support

Trust & presence

Domain Domain registered 2023

Gallery

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