| What it does | A fast, private and offline API client for REST, gRPC, GraphQL and WebSocket services
| XML validation and schema tools for developers
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
| NL
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| Pricing model | Open source
| Freemium
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| Pricing | Not given
| Free: unlimited individual XML checks, local validation, no account required. Pro: US$19/month (US$190/year), batch 25 files, 10 cloud projects, 10 schemas, 300 validations + 250 invoices/day. Team: US$49/month (US$490/year), batch 100 files, 50 shared projects, 100 schemas, 5 seats, 1,000 validatio
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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
| - Free local XML syntax and formatting checks
- XSD 1.0 validation with local imports and includes
- Optional XSD 1.1 and ISO Schematron XPath 1.0 server validation
- Cloud schema projects with version control
- Batch validation up to 25 files (Pro) or 100 files (Team)
- API access with daily quotas
- Public HTTPS schema import and structural comparison
- EN 16931 and XRechnung invoice validation
- Multi-format invoice validation (Factur-X, KSeF, RO e-Factura, HR-CIUS)
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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
| - Browser-based validation runs locally without uploading documents by default
- Explicit server processing consent required for any upload
- Comprehensive e-invoice validation across six European formats
- Built with AI assistance and documented with primary references
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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
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 6 ● no change since last check | 1 ● no change since last check |
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| Trust Flow (Majestic) | 5 | 0 |
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| Citation Flow (Majestic) | 26 | 4 |
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| Referring domains (Majestic) | 31 | 1 |
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Chapar
XSDHub