| What it does | Fast, 100% client-side developer platform with zero-data logging
| One app. Every platform. All Day.
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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 | Free
| Open source
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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.
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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
| - 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 | - 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
| - 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) | 1 ▲ +1 (up) since last check | 29 ● no change since last check |
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| Trust Flow (Majestic) | 1 | 1 |
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| Citation Flow (Majestic) | 19 | 25 |
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| Referring domains (Majestic) | 7 | 29 |
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Castov
Day