| What it does | Fast, 100% client-side developer platform with zero-data logging
| Free in-browser viewer for scientific and ML data files
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| Stage | Not given
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| Based in | Not given
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| Pricing model | Free
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| Pricing | All tools are free with no usage limits. The site may show ads in the future to cover running costs.
| Free
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| Key features | - Multi-timezone support with IANA database and daylight saving time
- JSON to TypeScript conversion
- JWT decoder and inspection
- Cron expression parser and generator
- End-to-end encrypted environment variable vaults
- P2P multiplayer canvas with WebRTC and CRDT
- Steganography for hiding encrypted secrets in images
- Service Worker API mocker for frontend testing
- Encrypted URL shares with hash fragment storage
| - 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
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| What makes it different | - Zero-data logging: no keystroke sent to external servers, all processing in browser memory
- 100% client-side operation works entirely offline
- Unified ecosystem across web, CLI, and AI agents via MCP Server
- Sub-millisecond performance with local execution
- Tool chaining and piping for seamless multi-stage workflows
| - 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
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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) | 1 ▲ +1 (up) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 1 | 0 |
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| Citation Flow (Majestic) | 19 | 22 |
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| Referring domains (Majestic) | 7 | 20 |
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Castov
ViewKit