Calibre Test Profiles – Test your sites under real world conditions
Hi HN! I'm Ben, the solo founder of Calibre Analytics: https://calibreapp.com. Calibre monitors websites and applications in a clean-room testing environment from all over the world. Up until January Calibre has been an "inbetween other things" / evenings / holidays kind of project. (Only, oops—I did that for four years.). Last year I knuckled down to get into the position where I could work on it full time. I've spent the last 8 weeks working on "Test profiles" (The launch post is here: https://medium.com/get-calibre/announcing-test-profiles-and-...)…
Calibre Test Profiles – Test your sites under real world conditions launched on March 23, 2017 with 57 votes, #800 of 3,481 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 9 years on.
In plain words
Calibre is a website monitoring platform that combines real user monitoring, Google CrUX data, and synthetic page speed tests. It tracks Core Web Vitals from actual browser sessions and runs lab tests from locations worldwide to identify performance issues. The platform is designed for development teams who need visibility into both how real users experience their sites and what Google's ranking algorithms see. Test profiles allow teams to emulate specific devices, network conditions, and user states when running tests.
written from the facts on this page · September 2026
From the sources
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. See what Google sees Track Google’s search site speed ranking CrUX dataset for every site you monitor. Synthetic testing to zero in Iterate from good to great with lab data that surfaces the exact issues your users are facing and validates your fixes. Calibre surfaces the…from calibreapp.com
In the maker’s words, at launch
Hi HN! I'm Ben, the solo founder of Calibre Analytics: https://calibreapp.com. Calibre monitors websites and applications in a clean-room testing environment from all over the world. Up until January Calibre has been an "inbetween other things" / evenings / holidays kind of project. (Only, oops—I…
Does a similar job
all alternatives →
SpeedVitals2023 · speedvitals.com · ▲829Hi HN, I’m Kashish, one of the co-founders of SpeedVitals, a platform for testing & monitoring website performance with a major emphasis on Core Web Vitals. Until now, our platform has only focused on Synthetic/Lab testing, such as Lighthouse tests and TTFB tests. But now, we have developed a Real-User Monitoring platform that doubles up as a Web Analytics tool. One major feature we have that most RUM tools lack is Performance Audits. Just like Lighthouse audits work on Lab test data, our audits work across all the real-user visits and gives suggestions on what task to prioritize first.…
- RTReal-time server monitoring in your browser2014 · scoutapp.github.io · ▲346
More dev tools this month
the category →
Contribute to oosexgang/hackios-xnu-kernel development by creating an account on GitHub.
Dev tools · 1d ago · github.com
open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.
Dev tools · 29d ago · github.com
Contribute to reladraw/reladraw development by creating an account on GitHub.
Dev tools · 27d ago · github.com
OpenBot▲362Grok Bot alternative: free, local, open-source, multiplayer
Dev tools · 24d ago · openbot.run
Talanoa▲346Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…
Dev tools · 22d ago · talanoa.email
Source: Show HN post ↗ · launch text quoted in part
Launched alongside, March 2017
the whole month →
Startup School▲1,010A free online program to teach you how to start a company
Life & fun · 2017 · startupschool.org
Hardbound 3.0▲739Illustrated summaries of bestselling nonfiction books
Life & fun · 2017 · apps.apple.com
