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Life & fun · April 22, 2014

Calibre

Comprehensive web performance monitoring

Calibre launched on April 22, 2014 with 64 votes, #463 of 1,174 launches that month. The site was still online in September 2026, 12 years on.

Visit calibreapp.com ↗Calibre alternatives

What it does

Calibre combines real user monitoring, Google CrUX data, and synthetic page speed tests so your team always knows where performance stands and what to fix.

Track real user experience , Google’s Core Web Vitals data , and run synthetic page speed tests in one platform. See it? Fix it. Just need a one-off check? Get a free Core Web Vitals report . See what real users experience, how Google assesses your site, and exactly what’s slowing pages down. Collect Core Web Vitals from real browser sessions on your websites. Lightweight, privacy-first, and ready in minutes. Track Google’s search site speed ranking CrUX dataset for every site you monitor. Iterate from good to great with lab data that surfaces the exact issues your users are facing and validates your fixes. Calibre surfaces the highest-impact issues and helps your team act on them. Less…from calibreapp.com

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