Insomnia

Open-source API client from Kong — design, debug, and test REST, GraphQL, gRPC, and WebSocket services.

Free

Pricing Tier

Easy

Learning Curve

Install and run same day

Implementation

small, medium, large

Best For

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✓ Use when

Developers who prefer a desktop client with Git-native storage and who want to test gRPC and WebSocket endpoints alongside REST.

✗ Avoid when

Teams that need deep governance, public API docs, or the collaboration surface area Postman offers at enterprise tiers.

What is Insomnia?

Insomnia is an open-source API client owned by Kong. It's popular with developers who want a desktop-first experience and Git-friendly collections stored as flat files. Since the 2023 account-required controversy, Kong has been rebuilding trust with a Scratch Pad mode for offline use. Native support for gRPC, WebSocket, and GraphQL subscriptions makes it stronger than Postman for some modern protocols.

Key features

✓REST, GraphQL, gRPC, WebSocket support

✓Git Sync for collections

✓Environment variables and template tags

✓Inso CLI for CI testing

✓Plugin ecosystem

Integrations

GitHubGitLabOpenAPI

💰 Real-world pricing

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