| What it does | One app. Every platform. All Day.
| HTML validation API and free online validator for deployed pages
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
| FR
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| Pricing model | Open source
| Freemium
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| Pricing | Not given
| Free: unlimited validators and checkers, no account required, free site scans. Solo: 49 EUR per month including full site reports and monitoring of 1 site. Agency: 149 EUR per month including monitoring of 10 sites. Automatic fixes: from 3 EUR for 10 pages, 1 free fix daily without account. Full sit
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| Key features | - 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
| - Accessibility (WCAG) validation with machine-detectable failures
- HTML specification compliance checking
- Meta tags and viewport validation
- Open Graph checker
- Page weight measurement and compression analysis
- Single API endpoint with configurable checks
- Single verdict field for build pipeline integration
- Automatic AI-powered HTML fixes
- Weekly site audits with change notifications
- GitHub Actions integration
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| What makes it different | - 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
| - One API call runs five checks on a single page fetch instead of five separate requests
- Single boolean verdict for build pipelines to act on without parsing prose
- False-positive filtering eliminates unreliable findings
- Quality score based on issue variety, not count, capping best-practice impact
- Free tools remain unlimited without account or daily limits
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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) | 29 ● no change since last check | 9 ● no change since last check |
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| Trust Flow (Majestic) | 1 | 10 |
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| Citation Flow (Majestic) | 25 | 32 |
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| Referring domains (Majestic) | 29 | 124 |
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Day
ValidateHTML