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Volley vs ValidateHTML

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

Volley compared with ValidateHTML
DetailVolley logo VolleyValidateHTML logo ValidateHTML
What it doesAPI sequence diagram tool with payloads on every arrow HTML validation API and free online validator for deployed pages
StageNot given Not given
FoundedNot given Not given
Based inNot given FR
Pricing modelFreemium Freemium
PricingFree: editor, local diagrams, share links, SVG and PNG export, CLI, 3 saved diagrams, HAR imports up to 8 requests, 200 hosted API and MCP calls a month, 1 webhook inbox with 25 requests a month, 1 recording link with 3 recordings. Pro: $9/month or $90/year (billed in advance), up to 1,000 saved dia 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
  • Plain-text sequence diagram editor with real-time rendering
  • Request and response payloads displayed on every arrow
  • HAR file import with automatic redaction of secrets
  • Webhook inbox to capture and diagram provider deliveries
  • Recording links to collect customer HAR files as diagrams
  • Drift Check to update diagrams when APIs change
  • SVG and PNG export for sharing and embedding
  • AI agent support via MCP server, HTTP API and CLI
  • README embeds that update when diagrams are edited
  • Presentation mode for step-through walkthroughs
  • 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
  • No account needed to write and share diagrams
  • AI can write diagrams from plain-text syntax
  • Built from real traffic: HAR files, webhooks and customer recordings
  • 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)3 no change since last check9 no change since last check
Trust Flow (Majestic)310
Citation Flow (Majestic)2232
Referring domains (Majestic)8124

5 details filled in for both companies.

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