| What it does | Free in-browser viewer for scientific and ML data files
| One app. Every platform. All Day.
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| Stage | Not given
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| Open source
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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
| - Native UI toolkits (AppKit, UIKit, Material Components, WinUI, GTK, Qt)
- Shared Rust codebase for interface and logic
- Localization with Fluent catalogs
- UI testing with DayScript walkthroughs
- Automated packaging and app store submission preparation
- Accessibility annotations with native integration
- Platform-specific extensions in Cargo crates
- VS Code extension for development workflow
- Crash reporting integration
- Reusable components across apps
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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
| - Single Rust codebase compiles to native machine code for each target
- Platform-native appearance and behavior without custom rendering
- Keep existing Rust libraries unchanged and reuse across platforms
- Full open source framework under MPL-2.0 with inspectable and modifiable code
- Unified CLI and test format for all platforms and builds
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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 | 29 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 1 |
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| Citation Flow (Majestic) | 22 | 25 |
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| Referring domains (Majestic) | 20 | 29 |
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ViewKit
Day