ValidateHTML vs Adanotch

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

ValidateHTML compared with Adanotch
Detail	ValidateHTML	Adanotch
What it does	HTML validation API and free online validator for deployed pages	A live island for your MacBook's notch that keeps pace with your daily workflow
Stage	Not given	Not given
Founded	Not given	Not given
Based in	FR	Not given
Pricing model	Freemium	Freemium
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	2-day free trial with no payment required. Yearly: $9.99/year. Lifetime: $23.99 one-time.
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	Create custom TypeScript extensions with AdanotchKit SDK Native SwiftUI rendering with 120 FPS ProMotion support Isolated JavaScriptCore process for each extension Strict permission model with user approval AI coding agent integration with Claude, Codex, Cursor System monitoring widgets for CPU, memory, battery External API fetching with caching support Local-first data storage with no cloud sync or telemetry
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	Built natively with Swift 6 instead of Electron, consuming minimal CPU and battery Local-first and private by design with zero telemetry or cloud tracking Developer-first with TypeScript SDK and AI coding agent supervision Fair pricing with 2-day free trial requiring no payment details Extensions run in isolated processes so crashes never freeze the island
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	9 no change since last check	Not checked yet no change since last check
Trust Flow (Majestic)	10	0
Citation Flow (Majestic)	32	0
Referring domains (Majestic)	124	0

5 details filled in for both companies.

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