Total CPU usage and Total network usage by ads for independent.co.uk: the 75th percentile value, with a trend over the last three months.
The four metrics are:
Viewport ad density: the share of the viewport covered by ads.
Viewport ad count: the number of ads visible in the viewport.
Total CPU usage by ads: processor time used by ad frames.
Total network usage by ads: data downloaded by ad frames and ad resources.
To be eligible for ad metrics data in CrUX, a site needs an ads.txt file with at least one authorised seller. If there’s no ad metrics data for a site, the Advertising section simply isn’t shown.
Today we are bringing Deployments to Real User Monitoring (RUM), making it easier compare performance before and after a release.
In RUM, you’ll see deployments running across the bottom of charts. Deployment flags display on hover and include commit details. You can click through to see the commit in your source control system.
Hovering a deployment marker reveals the commit, time and author, alongside that day’s metric.
Each metric page now includes a segmented view, so you can see how recent deploys compare, with full context of how much data is being assessed.
Metric: Largest Contentful Paint by Deployment. Each deployment is compared to the previous one.
Viewing more detail allows you to see recent deployments over time, and compare longer-term changes.
LCP by Deployment, showing where each deployment started and ended.
Or, alternatively, connect your GitHub account from Site → Settings → Integrations, and Calibre will watch GitHub for production deploys, using the Deployment Branches setting to work out which deployments count as production.
SyntheticPulse and Metrics have been revamped to display median aggregated metrics, combined for all pages.
Previously, you would view Synthetic metrics for a single page at a time. Now you can view all pages at once, or filter by a single page, as before.
Metric: Largest Contentful Paint for All pages.
Each metric page includes a segment views for:
By Test Profile: how each device profile differs.
By Deployment: how deployment changed the metric.
By Page: whether a change is site-wide or isolated.
Navigate to Synthetic → Pulse and click on a metric title to see the new metric pages, or go direct to Synthetic → LCP from the left-hand navigation to see the new metric page for Largest Contentful Paint.
You can freely switch between metrics, pages, and date ranges to see how your site performance is trending over time, and see how each segment contributes to performance.
Monitoring in-page UX in single-page apps (SPAs) has always been spotty. Core Web Vitals and other metrics are based around the concept of full page loads — but, SPAs load once, then swap content dynamically as users "soft" navigate. Everything after that first load has been somewhat invisible.
That changes with soft-navigation attribution, which lets browsers detect when an in-page navigation occurs — making it possible to collect accurate Core Web Vitals for each soft navigation.
Calibre RUM now measures soft navigations automatically, with no additional configuration required. Browser support is currently Chrome 151+, Edge 151+, so bare in mind that current observations will be limited, until browser support improves.
You’ll see Core Web Vitals for your SPA with accurate URL attribution, giving you a much clearer picture of real user experience across your sites and apps.
Filter any RUM report by Soft navigation to see how in-app route changes perform, including subparts and the elements responsible.
Filter any report to see soft navigations on their own, or view by navigation type to compare them against the initial load.
Grouping by Navigation type displays Soft Navigation performance alongside others. (Figures displayed are for demonstration purposes only).
If you already run Calibre RUM, there’s nothing to install or turn on: soft navigations start flowing in automatically.
Until now, managing which page URLs are monitored by Calibre’s Synthetic monitoring was a manual job. From today, Calibre can automatically crawl your site, looking for the most important pages.
You can type one URL into Calibre, and it will continuously crawl a site; finding new pages, and removing old ones, so you can monitor whole websites without having to think about constantly updating settings.
The new Synthetic site scan crawler uses signals such as internal link structure, navigation placement, and other factors to determine which pages are most important. Just like real users would when navigating your site.
When you add a Site, you’ll see a new option to Discover pages automatically. Alternatively, you can continue to Add pages manually.
Manage which URLs to monitor with Discover pages automatically or Add pages manually.
Once your Site has been created, you can watch data come in from Synthetic tests and Google’s CrUX (when available), or install RUM monitoring while you wait.
Site setup complete, Synthetic tests and CrUX data ready.
If you have an existing Site, you can switch to Discover pages automatically from Synthetic → Settings → Pages. After turning on this option, Calibre will scan your Site and monitor pages automatically.
The new Authentication panel (Organisation settings → Authentication) allows admins to configure SAML SSO and SCIM provisioning.
Domains are verified using DNS TXT records, and the connection is tested to ensure your IdP is configured correctly, avoiding account lockouts.
You can test the connection to verify your IdP is configured correctly before enforcing SAML SSO for your team.
Once you’ve verified your domain and tested the connection, you can enforce SAML SSO logins for your team, and optionally enable SCIM provisioning to automatically create, update and deactivate accounts from your identity provider.
We’ve also updated our Security and Privacy pages to cover SSO sessions, enforcement and how SSO account data is provisioned.
Read the documentation for more information on how to set up SAML SSO and SCIM provisioning for your organisation.
The Audit log gives a complete, organisation-wide record of security and administrative activity: sign-ins, member and role changes, credential and API key activity, billing and SSO changes, and more. It's built for compliance, security reviews and investigations, giving you a clear audit trail of who did what, when, and from where.
Every security and administrative event in your organisation, recorded with the person, action, target, country and device.
Filter by event type, time range or a single person, export a month of history at a time as NDJSON, or stream every event to your SIEM in real time with signed webhooks.
Stream every audit event to your SIEM or endpoint, signed so you can verify it came from Calibre.
You can also choose how long events are kept, and place a legal hold to preserve everything during an investigation or for compliance.
The Audit log is available now on the Company Plan. Read the documentation for setup, the event payload and signature verification.
Today we’re shipping a rebuilt interface, designed around an all-new primary navigation.
After a few years of growth and new features, we wanted to consolidate how people move around the app, and make it faster to get to the data that matters.
Switching between sites without leaving the keyboard: Command-K to open the switcher, arrow keys to find a site, and Enter to navigate.
Navigation is now a single, focused left-hand sidebar. At the top is a switcher: open it from anywhere with a keyboard shortcut (Command-K, or Ctrl-K), start typing, and jump straight to any site. You’ll see a list of the most recent sites, and you can search for others quickly.
The new Sites/home brings all your sites into one comparison view. You can switch between different team workspaces to compare sites by Synthetic, CrUX or RUM.
The new Sites home, showing the "Airline Benchmarks" team, with a data source toggle for Synthetic, CrUX and RUM.
Across Calibre, you’ll also notice a tighter, more cohesive design: more consistent typography and spacing, a clearer icon set, and a new loading skeleton built to avoid layout shift, so the app settles into place sooner.
We’ve made big improvements to CrUX monitoring, giving you a clearer view of how real users experience your site around the world. It now includes UX Rating, a brand-new Audience report, and a world map on every metric page, each adding a new level of insight.
UX Rating is a single score that summarises user experience quality, based on the percentage of users who experienced good performance for Core Web Vitals and Time to First Byte.
It has been part of RUM reporting for a while, and now it’s in CrUX Monitoring too.
You’ll see UX Rating on your Sites list (to compare all your monitored Sites at a glance), on the Pages report for each Site, and on the new Audience report, which breaks it down by country.
The Sites list ranks every Site you monitor by UX Rating, alongside LCP, CLS and INP, so you can benchmark against competitors at a glance.
The Audience report is the clearest view yet of where your users have a good experience, and where they don’t. You’ll see a world map of your UX Rating, ranked by country.
CrUX Audience plots your UX Rating on a world map, ranked by the best and worst-performing countries.
There’s also a breakdown by device types and navigation types, so you can gain a better understanding of how people experience your site in different contexts.
Up front, you’ll see UX Rating: the share of real-world experience on your site that rates as good. Every metric a real Chrome user records is graded, and UX Rating is the percentage of those grades that came back good.
It tells you how much of what your visitors experience is actually good, and gives you a faster read than scanning a wall of metrics. Read more about why we built UX Rating.
It also makes for clean comparisons: see how your UX Rating stacks up against competitors, side by side.
UX Rating is also plotted globally, rendered on our custom hexagonal world map, so you can see how user experience varies between the countries your site serves. There’s also map data for LCP, CLS, INP and even TTFB.
Performance by country, rendered on our 10kb hexagonal world map.
Country-level CrUX data requires using Google’s BigQuery database, which is complex and eye-wateringly expensive. We’ve done it; you don’t have to. And then we made it free.
Dig into Largest Contentful Paint, Cumulative Layout Shift and Interaction to Next Paint with up to 9 months of history, experience distributions, and subpart breakdowns.
Spot a degrading trend in LCP, see where your users are getting stuck on INP, or confirm a recent CLS fix landed cleanly.
The LCP detail page, with a trend chart flagging a degrading 75th percentile, and an experience distribution by user experience.
Drop in up to 5 sites and get a ranked leaderboard built from real Chrome user data, sourced from the Chrome User Experience Report. Every comparison gets a permalink and an auto-generated share card that names the winner.
An example share card comparing five major US retailers. ikea.com leads on Core Web Vitals with a score of 93, ahead of amazon.com (80), walmart.com (74), target.com (72) and uniqlo.com (66). Every comparison generates one of these automatically.
Use it to:
See who’s fastest among any group of sites: competitors, alternatives or your own portfolio.
calibre rum - access Real User Metrics data from your sites
calibre crux - access origin-level and URL-level Core Web Vitals from the Chrome User Experience Report, automatically collected by Calibre
calibre synthetic - existing synthetic monitoring commands are now namespaced under calibre synthetic
calibre deploy - deploy commands elevated to their own top-level namespace
calibre site list - now shows which data sources (Synthetic, CrUX, RUM) are active per site
calibre metric-list --type - filter metrics by data source (synthetic, crux, or rum)
Node.js API - new Crux and Rum programmatic exports
Deprecated aliases with warnings are provided for all moved commands, so existing scripts will continue to work while you migrate.
Using these new commands, you gain programmatic access to all your sites performance data. You can use this to build custom reports, integrate with other tools, or use code agents to interpret performance data and make recommendations.
This release introduces a new Baseline audit powered by Google Baseline. The audit detects web platform features in use on your pages and reports how well supported they are across browsers.
Each feature is checked against Baseline compatibility data, giving you a clear view of which features are widely supported, which are newly available, and which may still have limited browser support.
The Baseline audit shows detected web platform features alongside their browser support status.
This helps you make informed decisions about which features to use, and where polyfills or fallbacks might still be needed.
Understanding how your site performs in the real world is critical to delivering a fast, engaging experience. What actually happens when people visit? Does the page load quickly and smoothly? Without unexpected movement or interaction delays? Which pages are slowest? Are users having a good time?
Today, we’re launching Calibre RUM, which captures Core Web Vitals and key UX signals directly from real browser sessions. Now, you can see exactly where your site is fast, where it’s slow, and who is affected.
The RUM Dashboard shows live visitor counts, session totals, audience locations, and Core Web Vitals trends at a glance.
The Pages Leaderboard ranks your pages by traffic volume. You can sort by any metric (LCP, INP, CLS, or others) to find the pages with the worst user experience. Group pages by URL pattern (like /blog/* or /products/*) to see how vital sections of your site perform.
No guesswork. Start with the pages that affect the most users. Fix them, iterate.
Pages ranked by traffic volume, with Core Web Vitals scores for each.
Calibre RUM identifies the specific DOM elements responsible for slow renders (LCP), interaction delays (INP), and layout shifts (CLS). Add custom attribution with data-name or elementtiming attributes so it’s clear which element or image is causing them problem.
INP Attribution Targets identifies which interactive elements cause the longest delays.
The Audience Report shows what percentage of visitors had a good, to improve, or poor experience. It segments UX experience by page, page grouping, element, country, device type, browser, and more. You’ll see which areas are affected the most, and what’s worth investigating further.
See where user experience is strong and where it suffers, segmented by country, device, browser and more.
Calibre RUM collects no cookies, no personal data, and no IP addresses. Session identifiers live in sessionStorage and are discarded when the tab closes. The script supports signature-based subresource integrity (SSRI) to prevent supply-chain tampering, and you can optionally exclude EEA/EU visitors entirely. Learn about data collection, processing, retention, and more.
You set the session sampling rate and data retention period. Monitor at a level that matches your requirements, and budget. Sample by 15% of user sessions or 100%. Hard stop billing, or flexible, it’s up to you.
These updates reflect the addition of Real User Monitoring (RUM) to Calibre’s product suite.
Because RUM collects performance data from real visitor sessions on your website, our legal and security documentation needed to clearly describe how that data is collected, processed, stored, and protected — and what your responsibilities are as a customer deploying RUM.
We also took the opportunity to trim our sub-processor list (removals only, no new additions), and expanded our security page to reflect the full scope of our technical and organisational safeguards.
If you have questions about any of these changes, or want a copy of the revised Data Processing Agreement, contact us at privacy@calibreapp.com.
Figuring out which of your pages appear in Google’s Chrome User Experience Report (CrUX) has always meant manual work. Your site might have thousands of pages, but only a subset shows up in the CrUX dataset. Until now, identifying and tracking which URLs to monitor was on you.
Today, Calibre handles that automatically. Automatic page discovery for CrUX Pages finds the most important URLs on your site and tracks them, so you always have up-to-date, real-user performance data with zero manual setup.
Calibre discovers new pages as they're published. Here, recent "Tour Down Under" cycling event product collection page is automatically surfaced with real-user metrics only a few days after launch.
Calibre periodically spiders your website to build a map of your most important pages. We look at signals like navigation placement and internal link structure to determine which pages are most important, just like real users would when navigating your site.
Those pages are then matched against Google’s CrUX dataset. Pages with sufficient traffic to appear in CrUX are automatically tracked and kept up to date.
If a page doesn’t receive enough traffic to meet Google’s eligibility thresholds, it won’t appear in CrUX Pages. This is a limitation of the CrUX dataset itself.
Inspecting Interaction to Next Paint (INP) metric shows which Pages have the worst overall INP performance, so its easy to identify which Pages need attention most.
