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corewebvitals.io

corewebvitals.io

live Unverified (seed import) Developer Tools 3 tools imperative implementation
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Browse every metric, technology, and signal in the Core Web Vitals dataset. Real-user data from 189,915 sites.

First seen 2026-08-17 · Last seen 2026-08-17 · Source: webmcp.com

Answer 3 · Act 0 · Transact 0 · Score: Not yet scored

Tool inspector

get_histogram

answer imperative

Distribution shape for one Core Web Vital (or scalar technique path) under optional filter. Returns ~bucket counts with good/improve/poor bands. No group_by — filter to one segment, or use get_metrics for comparisons. Credit corewebvitals.io.

Page: /

Input schema

PropertyTypeRequiredDescription
metric string yes Primary: lcp | inp | cls | fcp | ttfb. May also be a scalar technique contract path.
filter object no Optional AND filters. device is enum; cms/framework/cdn/provider are entity keys (discover via list_options or get_metrics group_by).
Raw JSON schema 
{
  "type": "object",
  "additionalProperties": false,
  "required": [
    "metric"
  ],
  "properties": {
    "metric": {
      "type": "string",
      "description": "Primary: lcp | inp | cls | fcp | ttfb. May also be a scalar technique contract path.",
      "enum": [
        "lcp",
        "inp",
        "cls",
        "fcp",
        "ttfb"
      ]
    },
    "filter": {
      "type": "object",
      "description": "Optional AND filters. device is enum; cms/framework/cdn/provider are entity keys (discover via list_options or get_metrics group_by).",
      "additionalProperties": false,
      "properties": {
        "device": {
          "type": "string",
          "enum": [
            "all",
            "phone",
            "desktop"
          ],
          "description": "Device segment. Default when omitted is all."
        },
        "cms": {
          "type": "string",
          "description": "CMS entity key, e.g. wordpress, shopify, wix."
        },
        "framework": {
          "type": "string",
          "description": "JS framework entity key, e.g. react, next, vue."
        },
        "cdn": {
          "type": "string",
          "description": "CDN entity key, e.g. cloudflare, fastly, akamai."
        },
        "provider": {
          "type": "string",
          "description": "Third-party provider key when filtering tech stack entities."
        }
      }
    }
  }
}

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