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Best free api development tools

Free api development tools compared. Find the best free option based on features and limitations.

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1
Postman Free tier

API development platform for designing, testing, documenting, and monitoring APIs.

Free for 3 users · Free API developers wanting a complete API platform
Collections Mock Servers Monitoring Docs
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2
Insomnia Free tier Open Source

Open-source API client for REST, GraphQL, and gRPC with environment variables and plugin support.

Free for individuals · Free Developers wanting a lightweight REST and GraphQL client
REST GraphQL gRPC Plugins
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3
Hoppscotch Free Open Source

Open-source API development ecosystem with real-time WebSocket testing and team collaboration.

Free Developers wanting a fast, open-source API client
Open Source Real-Time WebSocket Team Collab
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4
Bruno Free Open Source

Open-source API client that stores collections as files on your filesystem — Git-friendly and offline-first.

Free Developers wanting a Git-friendly API client
Git-Friendly Offline-First Scripting No Cloud
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5
RapidAPI Free tier

API marketplace and development platform for finding, testing, and managing third-party APIs.

Free tier available · Free Developers wanting to discover, test, and connect APIs
API Marketplace Testing Hub Enterprise Gateway
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6
Swagger Free Open Source

Open-source API development framework with the OpenAPI specification.

Free API developers wanting standardized API documentation
OpenAPI Spec Code Gen UI Editor
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7
Stoplight Free tier

API design, documentation, and governance platform with OpenAPI support.

Free for 1 project · Free API teams wanting design-first API development
API Design Mock Servers Style Guides Docs
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8
Thunder Client Free

Lightweight REST API client built into VS Code with collections and environments.

Free VS Code users wanting a lightweight API client
VS Code Extension Collections CLI Git Sync
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9
Apidog Free tier

All-in-one platform for API design, debugging, testing, documentation, and mocking.

Free for 3 users · Free API teams wanting an all-in-one API development platform
API Design Debugging Mock Server Automation
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10 tools compared
Open source API Development tools
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Comparisons

Postman vs Insomnia
Postman vs Insomnia
Insomnia gives you open source and self-hosting; Postman is a managed service. Which trade-off works for you?
Postman vs Hoppscotch
Postman vs Hoppscotch
Hoppscotch gives you open source and self-hosting; Postman is a managed service. Which trade-off works for you?
Postman vs Bruno
Postman vs Bruno
Bruno gives you open source and self-hosting; Postman is a managed service. Which trade-off works for you?
Postman vs RapidAPI
Postman vs RapidAPI
Postman is built for api developers wanting a complete api platform. RapidAPI is built for developers wanting to discover, test, and connect apis. Pick the one that fits.
Postman vs Swagger
Postman vs Swagger
Swagger gives you open source and self-hosting; Postman is a managed service. Which trade-off works for you?
Postman vs Stoplight
Postman vs Stoplight
Postman is built for api developers wanting a complete api platform. Stoplight is built for api teams wanting design-first api development. Pick the one that fits.

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