| What it does | Free in-browser viewer for scientific and ML data files
| Web-based API platform for designing, testing, mocking, monitoring and documenting REST, GraphQL, gRPC, WebSocket, MQTT and MCP APIs
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| Stage | Not given
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| Free
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| Pricing | Free
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| Key features | - Browse HDF5 groups, datasets and attributes
- Read Parquet schemas, row groups and column statistics
- Open Zarr v2 and v3 stores from a folder or a zip
- Inspect Apache Arrow and Feather files
- View CSV, TSV and Excel spreadsheets
- Load NumPy .npy and .npz arrays
- List safetensors tensors and step through TFRecord records
- Slice N-dimensional arrays and render heatmaps
- Parse every file locally, with no upload
- Work offline after page loads
| - REST, GraphQL, gRPC, WebSocket, Socket.IO, SSE, MQTT and MCP clients
- API testing with pre-request and test scripts
- Collection runner with CSV and JSON data files
- Load testing with virtual users and profiles
- Mock servers with request matching and response templates
- API monitoring with scheduled runs and alerts
- Postman collection compatibility and migration
- GitHub sync to auto-generate collections from code
- Published API documentation with code samples
- Team collaboration with roles, comments and pull requests
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| What makes it different | - All data processing happens in your browser with no server uploads
- Opens very large files by reading only the bytes you view
- No installation, account or login required
- Comprehensive articles explaining data format specifications
| - Unified client for eight protocols in one workspace
- Native Rust engine uses 434 MB desktop memory versus 585 MB for Postman
- Automatic collection generation from GitHub repository code
- Postman collection and script compatibility without modification
- Free to use with no paid plans
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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) | Not checked yet ● no change since last check | 2 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 0 |
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| Citation Flow (Majestic) | 22 | 4 |
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| Referring domains (Majestic) | 20 | 1 |
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ViewKit
Swastik Codes