| What it does | HTML validation API and free online validator for deployed pages
| A signed, machine-readable copy of your website that AI agents can read and verify
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| Stage | Not given
| Startup
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| Founded | Not given
| 2025
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| Based in | FR
| US
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| Pricing model | Freemium
| Free
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| Pricing | 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
| Free for all accounts
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| Key features | - 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
| - 77 tools across 14 groups for setup, publishing, delivery, keys, readers, connectors, Google integration, listings, commerce, reports and company management
- Public API routes for reading company records without authentication
- RFC 9421 digital signatures with signature verification capability
- Read receipts tracking who accessed signed copies
- Automatic fallback to cached copies when Trooth is slow or unavailable
- Agent key support for autonomous AI operations
- Two-officer signing policy for company security
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| What makes it different | - 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
| - AI agents can autonomously set up and manage Semanto with MCP integration
- Cryptographically signed records that can be verified by anyone without authentication
- Public API routes with no account requirement for reading and verifying company records
- Adapter ensures website availability even when Trooth service is slow or down
- Comprehensive toolset of 77 tools for managing every aspect of signed company records
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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) | 9 ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 10 | 0 |
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| Citation Flow (Majestic) | 32 | 27 |
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| Referring domains (Majestic) | 124 | 35 |
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ValidateHTML
Semanto™