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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 & pros
Score: 82/100
Pros & Cons
Pros
- Web performance monitoring
- Core Web Vitals
- Good alerting
- Performance budgets
- Good documentation
Cons
- Expensive
- Per-test pricing
- Learning curve
- Enterprise focus
- UI complex
Key Features
Web performanceCore Web VitalsBudgetsSynthetic monitoringCompetitor trackingAlerts
Pricing Plans
15-day Free TrialStarter
$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
About Calibre
By Toolradar Team·
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.
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Calibre FAQ
Is Calibre free?
Yes, Calibre is completely free and open source. GPL license. Best e-book management software.
What is Calibre?
Calibre is e-book management software. Organize, convert, and sync e-books. Works with all major e-readers.
Can Calibre convert formats?
Yes, converts between most e-book formats. EPUB, MOBI, PDF, and many more. Essential for e-reader compatibility.
Does Calibre work with Kindle?
Yes, syncs with Kindle devices. Converts formats Kindle can read. Manages your entire e-book library.
Source: calibreapp.com