Dev tools · alternatives · 2026

24 alternatives to 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 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… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Calibre Test Profiles – Test your sites under real world conditions launched in 2017; newer entries below may have overtaken it.

1. 1
   SpeedVitals▲829

   Hi 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.…

   2023 · speedvitals.com · its alternatives →

2. 2
   Calibre▲64

   Comprehensive web performance monitoring

   2014 · calibreapp.com · its alternatives →

3. 3
   Reactful▲312

   Understand your visitors and optimize your site in real time

   2016 · reactful.com · its alternatives →

4. 4
   PageVitals▲76

   Keeps your website fast, page speed monitoring and CrUX

   2023 · pagevitals.com · its alternatives →

5. 5
   Calibre CLI▲38

   Automating monitoring and improving web performance

   2018 · calibreapp.com · its alternatives →

6. 6RT
   Real-time server monitoring in your browser▲346

   2014 · scoutapp.github.io · its alternatives →

7. 7
   OpenStatus▲434

   Hey HN! We’re Max and Thibault building OpenStatus.dev an OpenSource synthetic monitoring platform with incident managements 1 min demo: https://twitter.com/mxkaske/status/1685666982786404352 We have just reached 2000 stars on GitHub https://github.com/openstatusHQ/openstatus We are really excited to hear your feedback/questions and connect further: our emails are [email protected] and [email protected]. Thank you!

   2025 · openstatus.dev · its alternatives →

8. 8SG
   See Google's Data on Real User Site Performance for Any Site▲50

   2019 · crux.run · its alternatives →

9. 9
   SEO Speed Test▲513

   Google & ChatGPT ignore slow pages, check if yours is fast!

   2025 · seospeedtest.com · its alternatives →

10. 10
    Fullstory Free▲654

    Web analytics with full session playback, now free

    2017 · fullstory.com · its alternatives →

11. 11
    Free Monitoring Suite by WebGazer▲338

    Monitoring for websites, APIs, and cron jobs

    2024 · webgazer.io · its alternatives →

12. 12
    Free SEO Checker by Spotibo▲165

    An SEO checker that analyses based on Google's algorithm 👀

    2018 · spotibo.com · its alternatives →

13. 13
    Sitechecker▲303

    Toolkit to measure and track website SEO performance

    2020 · sitechecker.pro · its alternatives →

14. 14
    CheckStat▲111

    counter statistics, website traffic analyzer

    2024 · checkstat.net · its alternatives →

15. 15
    Checkly 2.0▲209

    Monitor your modern web app in 1 minute. Free dev plan!

    2021 · checklyhq.com · its alternatives →

16. 16
    Freshping by Freshworks▲245

    Free forever website monitoring & status pages 🤩

    2018 · freshworks.com · its alternatives →

17. 17IB
    I built an internet speed analytics tool▲89

    Senior full stack software engineer with 8+ years shipping production systems in React, Node.js, Python, and Rails. Previously a Product Engineer at Ghost. Based in South Korea.

    2021 · ronaldlangeveld.com · its alternatives →

18. 18
    Speedometer 3.0▲131

    Benchmarking app performance on the modern web

    2024 · github.com · its alternatives →

19. 19
    Livestats▲90

    Real time visitor stats for all of your websites

    2019 · its alternatives →

20. 20
    Loado▲160

    Performance monitoring for websites that you will love

    2023 · loado.dev · its alternatives →

21. 21
    Visitor profiles and timeline by Croct▲142

    Uncover the story behind every click to optimize your site

    May 2026 · croct.com · its alternatives →

22. 22
    illuminatr historic CrUX checker▲77

    Get the last 6 months of Web Vitals data for your website

    2023 · its alternatives →

23. 23
    pagecheck▲67

    Convert more users by ensuring your site loads fast

    2020 · its alternatives →

24. 24
    F19n Obtrusive Livetest▲82

    Frontend Performance Analysis Tool for Chrome

    2018 · github.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →