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Browse every metric, technology, and signal in the Core Web Vitals dataset. Real-user data from 189,915 sites.Listings are sourced from public community registries and shown as reported.
corewebvitals.io
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Tools
get_metricsanswerimperative
Cross-site Core Web Vitals and technique metrics from the State of Web Vitals explorer (Chrome field data + multi-site crawl). Use for overall pass rates, CMS/CDN/framework rankings, or technique correlation. Not per-site live RUM. Prefer list_options first if unsure of keys. Credit corewebvitals.io in any output.Input schema
{
"type": "object",
"additionalProperties": false,
"properties": {
"metrics": {
"description": "Which metrics to return. Built-ins: lcp, inp, cls, fcp, ttfb, good_all3, good_all3_plus_ttfb. Also contract paths (e.g. stack.framework, images.loading). Pass a comma-separated string or an array of strings. Default: lcp,inp,cls,ttfb,good_all3.",
"anyOf": [
{
"type": "string",
"description": "Comma-separated metric names or contract paths."
},
{
"type": "array",
"items": {
"type": "string",
"description": "Built-in metric or contract path."
},
"minItems": 1
}
],
"examples": [
"lcp,inp,cls,good_all3",
[
"lcp",
"good_all3"
]
]
},
"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."
}
}
},
"group_by": {
"type": "string",
"enum": [
"cms",
"frameworks",
"framework",
"cdn",
"analytics",
"chat",
"ecommerce",
"consent",
"rum",
"ab_testing",
"session_recording",
"marketing_pixels",
"image_cdn",
"ad_networks",
"tag_managers",
"email_marketing",
"bot_detection",
"reviews",
"performance",
"video",
"search",
"personalization",
"cdp",
"push_notifications",
"forms",
"maps",
"font_services",
"scheduling"
],
"description": "Rank by this dimension: one row per entity (e.g. group_by=cms for CMS standings). Omit for a single aggregate row."
},
"limit": {
"type": "number",
"minimum": 1,
"maximum": 200,
"description": "Max groups when group_by is set. Default 25."
},
"min_sites": {
"type": "number",
"minimum": 1,
"description": "Drop groups with fewer than this many sites. Default 50."
},
"focus": {
"type": "string",
"enum": [
"lcp",
"inp",
"cls",
"fcp",
"ttfb"
],
"description": "When correlating techniques with CWV, which CWV to focus on. Default lcp."
}
}
}get_histogramanswerimperative
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.Input 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."
}
}
}
}
}list_optionsanswerimperative
Discovery helper: valid filter keys, group_by values, built-in metric names, sample entity keys, and optional contract paths. Call this before get_metrics when unsure of allowed values.Input schema
{
"type": "object",
"additionalProperties": false,
"properties": {
"kind": {
"type": "string",
"enum": [
"all",
"filters",
"group_by",
"metrics",
"entities"
],
"description": "Subset to return. Omit or \"all\" for the full discovery payload."
},
"include_paths": {
"type": "boolean",
"description": "If true, include technique contract path samples when available."
}
}
}