Redocly vs Thunder Client
Redocly and Thunder Client are both popular tools in the API Development space. Both use a freemium pricing model, with Redocly starting at Free and Thunder Client at 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 Redocly if you want beautiful api documentation and developer portals from openapi specs.. Redocly's biggest strengths include produces the most visually polished api docs and free redoc renderer is excellent for open-source projects. It's also rated higher (4.2 vs 3.9). Choose Thunder Client if you prefer lightweight rest api client built directly into vs code.. Key advantages include no context switching — api testing in your editor and lightweight and fast compared to desktop apps.
Beautiful API documentation and developer portals from OpenAPI specs.
Lightweight REST API client built directly into VS Code.
| Redocly | Thunder Client | |
|---|---|---|
| Pricing | Free | Free |
| Free Tier | Yes | Yes |
| Pricing Model | Freemium | Freemium |
| Rating | ★ 4.2 | ★ 3.9 |
| Categories | Documentation Generation, API Development | API Development |
| Key Features | 6 features | 6 features |
| Feature | Redocly | Thunder Client |
|---|---|---|
| Beautiful API reference docs from OpenAPI specs | ✓ | — |
| Redoc open-source API documentation renderer | ✓ | — |
| API linting and validation CLI | ✓ | — |
| Developer portal with guides and tutorials | ✓ | — |
| Custom branding and theming | ✓ | — |
| Try-it console for interactive API testing | ✓ | — |
| 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 | — | ✓ |
Redocly
Pros
- + Produces the most visually polished API docs
- + Free Redoc renderer is excellent for open-source projects
- + Strong OpenAPI linting catches spec issues early
- + Full developer portal beyond just API reference
Cons
- − Full developer portal features require paid plan
- − Customization requires familiarity with their system
- − Limited to OpenAPI — no GraphQL or gRPC support
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
The Bottom Line
Choose Redocly if: you want beautiful api documentation and developer portals from openapi specs.. It's completely free to use. It holds a higher user rating (4.2 vs 3.9). Keep in mind: full developer portal features require paid plan.
Choose Thunder Client if: you prefer 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.
Both tools compete in the API Development space. The right choice depends on your specific needs, team size, and budget.
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