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HTML Validity Checker
Run local structural HTML checks for duplicate IDs, labels, links, headings, and document basics.
For developers, students, agencies, and QA teams who want a quick pre-validation pass.
Store listing links will be added here as each marketplace review clears.
Status
Store listing links to be added as each browser review clears.
Pricing
Free launch utility. Batch checks planned.
Platforms
Chrome, Edge, Firefox
What it does
Built around one clear workflow.
Checks run locally and do not send page HTML, findings, browsing history, or settings to A1 Apps.
- Checks duplicate IDs, empty href/src values, language, title, headings, labels, and image alt text.
- Includes selector hints and short snippets where available.
- Keeps scope clear as a quick local check, not a formal validator replacement.
Related
More in browser extensions.
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