Chapar
Chapar: A private, open-source desktop client for local REST, gRPC, and GraphQL work. Ranked #23 of 38 in API Clients by our editors (6.8/10); pricing: Free plan; best for private local API development.
At a glance
- Editor score6.8 / 10
- PricingFree plan
- Best forPrivate local API development
- Free planYes
- Paid fromFree
- Facts checked20 Sep 2026
Where it wins
- Free and open source with local-only data storage
- Supports REST, gRPC, GraphQL, authentication, and scripting
- Imports OpenAPI, Postman collections, requests, and environments
Where it doesn't
- WebSocket support is not included
- Testing and team capabilities are limited
- The project is described as being in early beta
Our verdict on Chapar
Chapar is a native, open-source desktop API client for developers working with REST, gRPC, and GraphQL services. It runs on macOS, Windows, and Linux, with workspaces for organizing requests and collections. Environments can store API keys, base URLs, and variables, while authentication options include Basic, Bearer, and API Key methods. Its local-only data storage makes it suited to private local API development and teams or individuals who prefer an offline desktop workflow.
Its strongest fit is a workflow centered on importing and organizing existing API definitions. Chapar supports OpenAPI, Postman collections, requests, and environments, alongside gRPC reflection and Protocol Buffer files. Request chaining, pre- and post-request options, and Python scripting add control for multi-step request flows. These capabilities make it more than a basic request sender, particularly for developers moving between REST and gRPC services or maintaining several environments locally. GraphQL support also broadens its protocol coverage, while the desktop distribution keeps the product focused on local development.
The trade-off is scope. WebSocket support is not included, and the product does not provide the testing, documentation, or team capabilities that may matter in broader API collaboration workflows. The maintainers describe Chapar as being in early beta, which makes it a better choice for developers who value open-source software, local data, and a focused desktop client than for organizations seeking a fully developed team platform. Choose Chapar for private REST, gRPC, and GraphQL development across macOS, Windows, or Linux; consider another API client if WebSocket work, shared team features, or dedicated testing and documentation workflows are central.
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Chapar pricing
Chapar fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| GraphQL support | Yes |
| gRPC support | Yes |
| WebSocket support | No |
| Automated test runs | Not verified |
| API documentation | Not verified |
| Team workspaces | Not verified |
| Available platforms | Desktop |
| Deployment | Desktop |
| Platforms | Windows, macOS, Linux |
| Integrations | 4 integrations: OpenAPI, Postman, gRPC, Protocol Buffers |
| Pricing | Free plan |
| Website | chapar.rest |
| Facts checked | 20 Sep 2026 |
Chapar integrations
Chapar lists 4 integrations on its own site.
- OpenAPI
- Postman
- gRPC
- Protocol Buffers
Alternatives to Chapar
- PostmanA broad API workspace spanning requests, testing, mocking, specifications, and delivery workflows.9.4
- SoapUIA mature, testing-focused API client for REST, SOAP, GraphQL, and CI workflows.9.2
- ApidogA broad API workspace for teams that want design, testing, mocks, and CI/CD together.8.8
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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