UX Score and Web Vitals (TTFB, FCP, LCP, INP, CLS) for any website, from real-user CrUX data.
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Compares the Iron/Out UX Score of 2 to 5 websites side by side, using real-user Chrome UX Report (CrUX) data from the last 28 days (Web Vitals: TTFB, FCP, LCP, INP, CLS). Use this for competitor or sector comparisons. It runs no lab test or Lighthouse. Returns a ranking and a link to the full comparison.
The websites to compare, for example ["zalando.nl", "wehkamp.nl"].
Sector label shown in the report, for example Electronics. It does not change the scores.
Language of the linked report. Use nl when the user writes in Dutch.
Pick your client. Values in capitals, like YOUR_TOKEN, are yours to fill in.
claude mcp add --transport http ux-benchmark https://www.iron-out.io/mcp
Compares the Iron/Out UX Score of 2 to 5 websites side by side, using real-user Chrome UX Report (CrUX) data from the last 28 days (Web Vitals: TTFB, FCP, LCP, INP, CLS). Use this for competitor or sector comparisons. It runs no lab test or Lighthouse. Returns a ranking and a link to the full comparison.
| Argument | Type | Description |
|---|---|---|
| urls* | array | The websites to compare, for example ["zalando.nl", "wehkamp.nl"]. |
| category | string | Sector label shown in the report, for example Electronics. It does not change the scores. |
| language | string | Language of the linked report. Use nl when the user writes in Dutch. |
{
"type": "object",
"required": [
"urls"
],
"properties": {
"urls": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 5,
"minItems": 2,
"description": "The websites to compare, for example [\"zalando.nl\", \"wehkamp.nl\"]."
},
"category": {
"type": "string",
"description": "Sector label shown in the report, for example Electronics. It does not change the scores."
},
"language": {
"enum": [
"en",
"nl"
],
"type": "string",
"description": "Language of the linked report. Use nl when the user writes in Dutch."
}
}
}Returns the Iron/Out UX Score (0 to 100) for one website, using real-user Chrome UX Report (CrUX) data from the last 28 days. The score is built on five Web Vitals: TTFB (10%), FCP (15%), LCP (25%), INP (25%) and CLS (25%). Use this when the user asks how fast or user-friendly a site is for real visitors. It does not run a lab test or Lighthouse and does not load the site. Sites with too little Chrome traffic have no CrUX data and return no score. If a monthly revenue band is given, it also estimates the revenue at stake. Returns a summary and a link to the full report.
| Argument | Type | Description |
|---|---|---|
| url* | string | Website or page to check, for example zalando.nl or https://www.example.com/. Use the shop domain visitors actually use (for example www2.hm.com). |
| language | string | Language of the linked report. Use nl when the user writes in Dutch. |
| monthlyRevenue | string | The site's monthly online revenue band. Only set this if the user said it. Never guess it. |
{
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"type": "string",
"description": "Website or page to check, for example zalando.nl or https://www.example.com/. Use the shop domain visitors actually use (for example www2.hm.com)."
},
"language": {
"enum": [
"en",
"nl"
],
"type": "string",
"description": "Language of the linked report. Use nl when the user writes in Dutch."
},
"monthlyRevenue": {
"enum": [
"Under €500k",
"€500k to €2M",
"€2M to €10M",
"Over €10M"
],
"type": "string",
"description": "The site's monthly online revenue band. Only set this if the user said it. Never guess it."
}
}
}We read every tool's name, description and inputs the way the model will, looking for instructions hidden from you. A clean result means no warning signs, not a guarantee. Scanned Nov 2, 2026.