| What it does | HTML validation API and free online validator for deployed pages
| AI skill manager that keeps your skills together across tools
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| Stage | Not given
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| Founded | Not given
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| Based in | FR
| US
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| Pricing model | Freemium
| Freemium
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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: £0/month with core features. Individual: £6.99/month (one person, 7-day trial). Team: £12.99/member/month (billed per active member).
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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
| - Unified library for importing and organizing skills from multiple sources
- Source tracking to monitor when skills change and decide whether to update
- Security review with Cisco Skill Scanner for prompt injection, exfiltration, and obfuscated code
- Selective skill delivery to specific projects and tools
- Skill capture to turn successful workflows into reusable skills
- Skillbox Trim to reduce command output noise from agent context
- Skillbox AI to draft and review skills with assistance
- Shared workspaces for team collaboration without forcing skills on individuals
- Team standards to require specific skills for workspace consistency
- Weekly workspace usage reports for team admins
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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
| - Library remains separate from active setup, delivering only relevant skills to each tool or project
- Source attachment remembers GitHub or GitLab origin so you can compare versions before updating
- Security findings and approvals tied to exact version reviewed, not carried forward automatically
- Shared team skills do not override individual personal libraries
- Works with existing tools without requiring abandonment of Cursor, Claude Code or repositories
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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 | 2 ▲ +2 (up) since last check |
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| Trust Flow (Majestic) | 10 | 0 |
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| Citation Flow (Majestic) | 32 | 0 |
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| Referring domains (Majestic) | 124 | 0 |
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ValidateHTML
Skillbox