Chapar vs eryx
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
Chapar compared with eryx
| Detail | 
Chapar | 
eryx |
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| What it does | A fast, private and offline API client for REST, gRPC, GraphQL and WebSocket services
| WebAssembly sandbox for running untrusted Python safely
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Open source
| Open source
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| Pricing | Not given
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| Key features | - REST and HTTP with every method, query and path params, JSON, XML, text, form-data, URL-encoded and binary bodies
- gRPC with server reflection or proto files, unary and server-streaming calls, metadata and trailers, TLS and mutual TLS
- GraphQL queries and variables with data and errors split out
- WebSocket text, JSON and binary messages with live message log
- Traffic proxy to capture HTTP(S) traffic of apps and phones
- Python scripting for pre and post-request scripts with tests
- Test cases and CI integration with chapar-cli
- Environments with variables and secret values encrypted with OS keychain
- Import Postman collections, OpenAPI specs and proto files
- Code generation for cURL, Python, Go, JavaScript, Java, Ruby and .NET
| - Full CPython 3.14 with standard library
- Async callbacks from sandboxed code
- No filesystem or network unless allowed
- Fast startup in 1–5 milliseconds
- Embed from Python, JavaScript or Rust
- MCP server support
- gRPC server deployment
- Hosted execution over HTTP and WebSocket
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| What makes it different | - Local-only data with no cloud sync or telemetry
- GPU-rendered native UI that starts quickly and runs on macOS, Linux and Windows without a browser engine
- Collections stored as YAML files in git for version control
- Built-in traffic proxy for inspecting and importing HTTP(S) traffic from other apps
- Free and open source under BSD 3-Clause license
| - Full CPython 3.14 running in WebAssembly
- Async callbacks between sandbox and host
- Extremely fast sandbox startup
- Works as MCP server for AI agents
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
| Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 6 ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 5 | 0 |
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| Citation Flow (Majestic) | 26 | 6 |
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| Referring domains (Majestic) | 31 | 2 |
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4 details filled in for both companies.
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