One-call Core Web Vitals assessment for an origin or URL over the latest 28-day window. Per metric (LCP, INP, CLS + diagnostic FCP and TTFB): p75, rating (good | needs-improvement | poor, web.dev thresholds: LCP ≤2500ms/>4000ms, INP ≤200ms/>500ms, CLS ≤0.10/>0.25) and the good/needs_improvement/poor user-experience densities (~sum 1.0). passes_core_web_vitals is true when all three CWV rate good. Timings are ms; CLS is unitless. Returns {no_data: true} when the origin/URL has insufficient traffic in CrUX. Provide exactly one of origin or url.

Compares real-user performance across device classes for an origin or URL: one aggregated all-devices record plus phone, desktop and tablet records (4 API requests = 4 quota units of the 150/min budget). Per device: p75 + rating per metric; traffic_share gives each device's fraction of page loads (from the unfiltered form_factors metric). Devices without enough data come back as {no_data: true} — expected for tablet almost always. Default metrics: the three Core Web Vitals. Provide exactly one of origin or url.

Compares the site-wide origin record against one specific page (2 API requests): p75 + rating per metric for each, so you can tell whether a page is faster or slower than the site average. Either side can come back {no_data: true} (single pages often lack data; redirecting homepages can lack origin data while pages have it). Default metrics: the three Core Web Vitals. Both origin AND url are required here (unlike the other tools).

Weekly p75 trend for an origin or URL from the CrUX History API (1 request). Per metric: points — array of {period_end, p75, rating}, one per week (each week is a 28-day rolling window ending on period_end; ineligible weeks are skipped), and delta — first vs last p75 with direction improved | regressed | stable (lower is always better). Default metrics: the three Core Web Vitals; weeks caps the history depth (1..40, default 25). History data updates on Mondays. Returns {no_data: true} when CrUX has no data. Provide exactly one of origin or url.

Returns the latest 28-day rolling CrUX record for an origin or URL (raw API response, updated daily ~04:00 UTC). Per metric: histogram (3 bins good/needs-improvement/poor with density), percentiles.p75, and for enum metrics fractions. Timings are integer ms; cumulative_layout_shift p75 is a string-encoded double (e.g. "0.05"). collectionPeriod always spans 28 days. urlNormalizationDetails appears if the URL was normalized (e.g. fragment stripped). A no-data answer (HTTP 404) is returned as {no_data: true} — not an error. Prefer get_core_web_vitals for a ready-made assessment; use this for full histograms/fractions.

Returns the weekly CrUX timeseries for an origin or URL (raw API response, updated Mondays ~04:00 UTC): up to 40 collection periods, each a 28-day rolling window. Per metric: histogramTimeseries (bins with densities arrays), percentilesTimeseries.p75s and fractionTimeseries; all series align with record.collectionPeriods. Ineligible periods appear as null p75s and "NaN" densities — tolerate non-numeric entries. A no-data answer (HTTP 404) is returned as {no_data: true}. Prefer get_cwv_trend for a cleaned p75 trend.