Calibre for Product Teams
Ship fast experiences with confidence
Understand how real users experience your product, catch regressions before they ship, and align your team around performance goals that matter.
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Why Product Teams love Calibre
Track marketing & product pages in one place
Test logged in and private pages
Align the team on shared speed goals
Catch regressions in pull requests
Get monthly performance summaries automatically
Quantify third-party impact
“Thanks to detailed page breakdowns and filtering, I’ve found performance issues way deeper into customer journeys than I’ve seen before.”
Real User Data
Understand real-user experience
See how real users experience your product with Real User Monitoring.
See how real users experience your product
Calibre’s Real User Monitoring gives you real Core Web Vitals from actual visitor sessions.
Learn about Real User Monitoring →Measure page types, not just URLs
Group related URLs with patterns to see how product pages, search results or the checkout flow perform for real users, wherever those pages live.
Learn about page groupings →Investigate
Understand the real cost of third-party scripts
Measure the transfer size and execution time of every external service on your pages. Make informed decisions about what stays.
Measure third-party cost
See the transfer size, execution time, and main-thread impact of every external script. Find what to keep, optimise, or remove.
Learn about Third-Party Report →Block and compare
Run tests with and without specific third parties (3P) using host blocking. Quantify the exact impact before making the case to remove them.
Learn about 3P & Host Blocking →Questions from product teams
What is the difference between Real User Monitoring, CrUX and synthetic testing?
Real User Monitoring measures visits to your product, all of them or a sample you choose. CrUX is Google’s dataset of real Chrome user experiences, available for any site with enough traffic and with nothing to install. Synthetic testing runs Lighthouse on a schedule in controlled conditions, so you can catch regressions and compare releases. Calibre combines all three.
Can we monitor pages behind a login?
Yes. Real User Monitoring measures any page that loads the Calibre snippet, including logged-in pages. Synthetic tests can log in with single or multi-step forms, basic authentication, or custom cookies and headers.
How do we measure a whole flow, like checkout?
Create page groupings with URL patterns for each page type, such as product pages or each checkout step. Compare groupings in the Pages, metric and Audience reports, or filter any RUM report to a single grouping.
How do we keep the whole team aligned on performance?
Set performance budgets with alerts by email or Slack, test pull requests before they merge, and let the monthly Team Insights report summarise how every Site changed for everyone in the Team.
How do we find out what third-party scripts cost us?
Every synthetic test includes a Third Party report with the transfer size and execution time of each external service. Block a provider in a Test Profile to measure the difference with and without it.
Need help to dial in your new speed system?
Our friendly, knowledgeable team will help you establish a system that works efficiently or answer any questions. We’re here to support you in your web performance journey. Contact support.
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Conversation ratings collected with Intercom over the past 3 months.
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Fast website, happy customers
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