Everything you need to improve web performance

One place to track Core Web Vitals with real user and synthetic data. Set up once, monitor every day.

Calibre's Core Web Vitals assessment dashboard sourced from CrUX. Shows LCP of 2.43s, CLS of 0.19 and INP of 352ms with accompanying 75th percentile charts.

Trusted by teams at

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Analyse synthetic and real-user data

Calibre brings the best of both worlds: reliability of lab testing and user experience signals from real sessions.

Core Web Vitals assessmentCompetitor dashboardsFully configurable

Now we can provide our clients with solutions, instead of setting up our own tooling.

Chris Free

Chris Free

Chief Executive Officer

 
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Meet speed goals with Budgets

Budgets focus your team on reachable performance goals. And help maintain them.

Always know where you’re atGet metric recommendationsAvoid regressionsCompare pages and testing profiles

Thanks to Calibre’s reporting, we were able to detect a massive downgrade in performance.

Bernardo Baquero Stand

Bernardo Baquero Stand

Senior Frontend Developer

 
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Avoid regressions with Pull Request Reviews

Pull Request Reviews use your existing release process, catch issues during development, and prevent impacting your customers.

Work-in-progress reportsTest in CI/CDNo degrading releases

Guaranteeing our clients good performance and delivering best practices has never been easier for us.

Carolina J Pernaut

Carolina J Pernaut

QA Practice Manager at ITX Corp

 
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Address speed issues with Snapshot Reports

Snapshots show performance issues with clear, visual reporting tailored for you. No more complex interfaces.

Stay on top of performanceReduce third-party impactImprove Core Web VitalsOptimise long JavaScript tasks

Calibre delivers the substance behind the statistics. They know the actionability of performance measurement is paramount.

Paul Irish

Paul Irish

Staff Software Engineer

 
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Share performance data with everyone

Calibre is easy to incorporate into your existing tools and processes. Share Core Web Vitals with decision makers.

One platform for all web performance needs

Check first results in just a couple minutes. Start improving performance the same day.

Screenshot of Core Web Vitals assessment in Calibre