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Fallow vs ValidateHTML

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Fallow compared with ValidateHTML
DetailFallow logo FallowValidateHTML logo ValidateHTML
What it doesCodebase intelligence for TypeScript and JavaScript HTML validation API and free online validator for deployed pages
StageStartup Not given
Founded2026 Not given
Based inNL FR
Pricing modelFree Freemium
PricingNot 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
Key features
  • Health scoring and complexity analysis
  • Dead code and unused export detection
  • Code duplication detection
  • Architecture boundary enforcement
  • Styling drift detection
  • VS Code extension with Code Lens and fixes
  • CLI with local analysis
  • MCP server and agent integration
  • Runtime coverage with production data
  • Automatic code fixes
  • 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
What makes it different
  • Reads entire repository as one graph in under a second
  • Checks problems between files that linters and TypeScript miss
  • Free and open source under MIT license
  • No source code uploaded; all analysis runs locally
  • Bootstrapped with no venture capital funding
  • 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
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)32 no change since last check9 no change since last check
Trust Flow (Majestic)810
Citation Flow (Majestic)4032
Referring domains (Majestic)208124

5 details filled in for both companies.

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