Thunder Client vs Insomnia
Thunder Client and Insomnia are both popular tools in the API Development space. Thunder Client uses a freemium model starting at Free, while Insomnia is open-source from Free. Both offer a free tier to get started. Below we break down features, pricing, strengths, and weaknesses to help you decide which tool fits your workflow best.
Last updated: March 2026
Quick Verdict
Choose Thunder Client if you want lightweight rest api client built directly into vs code.. Thunder Client's biggest strengths include no context switching — api testing in your editor and lightweight and fast compared to desktop apps. Choose Insomnia if you prefer open-source api client for rest, graphql, grpc, and websocket testing.. Key advantages include clean, focused interface without postman's bloat and excellent graphql and grpc support. It's also rated higher (4.2 vs 3.9).
Lightweight REST API client built directly into VS Code.
Open-source API client for REST, GraphQL, gRPC, and WebSocket testing.
| Thunder Client | Insomnia | |
|---|---|---|
| Pricing | Free | Free |
| Free Tier | Yes | Yes |
| Pricing Model | Freemium | Open-source |
| Rating | ★ 3.9 | ★ 4.2 |
| Categories | API Development | API Development |
| Key Features | 6 features | 6 features |
| Feature | Thunder Client | Insomnia |
|---|---|---|
| REST API testing inside VS Code | ✓ | — |
| Environment variables and request collections | ✓ | — |
| Test scripting for automated validation | ✓ | — |
| Git-friendly JSON file storage | ✓ | — |
| GraphQL support | ✓ | — |
| Import from Postman, Insomnia, and OpenAPI | ✓ | — |
| REST, GraphQL, gRPC, and WebSocket support | — | ✓ |
| Environment variables and request chaining | — | ✓ |
| Code generation in multiple languages | — | ✓ |
| Git sync for team collaboration | — | ✓ |
| Plugin system for extensibility | — | ✓ |
| OpenAPI design and linting | — | ✓ |
Thunder Client
Pros
- + No context switching — API testing in your editor
- + Lightweight and fast compared to desktop apps
- + Git-friendly file storage for team collaboration
- + Easy migration from Postman with import feature
Cons
- − Less feature-rich than Postman for complex workflows
- − Advanced features require paid plan
- − VS Code only — not available in other editors
Insomnia
Pros
- + Clean, focused interface without Postman's bloat
- + Excellent GraphQL and gRPC support
- + Open-source with self-hosted option
- + Git-based collaboration keeps data in your control
Cons
- − Smaller plugin ecosystem than Postman
- − Cloud sync features require paid plan
- − Recent licensing changes have concerned community
The Bottom Line
Choose Thunder Client if: you want lightweight rest api client built directly into vs code.. It's completely free to use. Keep in mind: less feature-rich than postman for complex workflows.
Choose Insomnia if: you prefer open-source api client for rest, graphql, grpc, and websocket testing.. It's completely free to use. It holds a higher user rating (4.2 vs 3.9). Keep in mind: smaller plugin ecosystem than postman.
Both tools compete in the API Development space. The right choice depends on your specific needs, team size, and budget.
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