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  7. Calibre
Calibre

Calibre

Unclaimed

Web performance monitoring and optimization

DevOps

TL;DR - Calibre

  • Calibre is a web performance monitoring platform for continuous speed testing
  • It tracks Core Web Vitals, runs synthetic tests, and provides performance budgets
  • Plans from $45/month
Pricing: Paid only
Best for: Enterprises & professionals
Score: 82/100

Pricing Plans

15-day free trial

Starter

$50/month

Small teams

  • Performance monitoring
  • Core Web Vitals
  • Alerts
  • Basic features
Most Popular

Team

$150/month

Teams

  • More tests
  • API access
  • Integrations
  • Priority support

Business

$350/month

Large teams

  • Unlimited tests
  • SSO
  • SLA
  • Dedicated support
View full pricing

About Calibre

Calibre measures web performance and tracks it over time. Not just page load metrics—Core Web Vitals, accessibility scores, and performance budgets that alert you when sites get slower. Synthetic monitoring tests from multiple locations. Competitive benchmarking shows where you stand. Historical data reveals performance trends. Teams serious about web performance use Calibre to maintain speed over time, catching regressions before users notice.

Reviews

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Calibre FAQ

Yes, Calibre is completely free and open source. GPL license. Best e-book management software.

Calibre is e-book management software. Organize, convert, and sync e-books. Works with all major e-readers.

Yes, converts between most e-book formats. EPUB, MOBI, PDF, and many more. Essential for e-reader compatibility.

Yes, syncs with Kindle devices. Converts formats Kindle can read. Manages your entire e-book library.

Quick Info

Pricing
Paid
Visit Website

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