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Catch missing, file-name and filler alt text on a page, and weak og:image alt, before it ships

Alt text qualityFreeFor developers, designers and writers

15/day

free runs a day, no sign-in.

Before: what you give it

The example input, as typed in. You give it a page address.

<img src="/img/Les_Miserables_(29715636001).jpg" alt="Les_Miserables_(29715636001).jpg"><img src="/a.jpg" alt="Les Miserables, picture"><img src="/b.jpg" alt="image of a theatre"><img src="/c.jpg" alt="The Palais des Sports in Paris at dusk"><img src="/d.jpg"><meta property="og:image" content="/og.jpg">

After: what comes back

The first lines of a real run on that input. Nothing here is edited by hand.

Source: pasted input. Found 5 img elements in the markup and read all 5. 0 are aria-hidden or marked presentational and were counted but not judged. 0 have empty alt (decorative). 1 have no alt attribute.
Images with a problem: 4 of 5 judged. file-name 1, template-fallback 1, image-of 1, missing-alt 1

#1 /img/Les_Miserables_(29715636001).jpg
   alt: "Les_Miserables_(29715636001).jpg"
   [HIGH] file-name: reads like a file name
#2 /a.jpg
   alt: "Les Miserables, picture"
   [MEDIUM] template-fallback: looks like a fallback pattern ("<Title>, picture") rather than a description
#3 /b.jpg
   alt: "image of a theatre"
   [MEDIUM] image-of: screen readers already announce an image; start with what it shows
#5 /d.jpg
   alt: (missing)
... full output on the tool page

What you get

Every img judged, with counts per problem type, duplicates, and social-image alt status

What it cannot do

Static HTML only; it judges the wording of alt text, not whether it matches what the image shows.

Who it is for

  • Developers
  • Designers
  • Writers

Free and Pro

Free15 runs a day per IP address, up to 200,000 characters a run.
ProNo daily limit, 300 requests a minute, up to 200,000 characters a run.

What each plan includes

Use it from your assistant

The tool is called alt_text_quality. Connect the server once, then ask for it by name or just describe the job. Install steps for each app.

claude mcp add --transport http designers https://designers.allthepossibles.com/mcp
curl -X POST https://designers.allthepossibles.com/api/alt-text-quality -H 'content-type: application/json' -d '{"html":"<img src=\"/img/Les_Miserables_(29715636001).jpg\" alt=\"Les_Miserables_(29715636001).jpg\"><img src=\"/a.jpg\" alt=\"Les Miserables, picture\"><img src=\"/b.jpg\" alt=\"image of a theatre\"><img src=\"/c.jpg\" alt=\"The Palais des Sports in Paris at dusk\"><img src=\"/d.jpg\"><meta property=\"og:image\" content=\"/og.jpg\">"}'

Try it here

The form starts with the same example input, so you can run it first and then swap in your own.

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