About Boomerang
boomerang is a JavaScript library that measures the page load time experienced by real users, commonly called RUM (Real User Measurement).
How many people use Boomerang
GitHub · npm- #1
web-vitals8.6k - #2Boomerang1.9k
- #3
Elastic APM301 - #4
Splunk RUM64
#2 of 4 RUM we have counts for (of 27) · bars are GitHub stars across these neighbours; the category leader is web-vitals at 8.6k · as of September 7, 2026
Compare
Boomerang#2 of 4 RUM
web-vitals#1 of 4 RUM
Audit any site that runs Boomerang.
Enter a URL to score its stack for technology quality, version health, Lighthouse performance - and AI-readiness.
How we audit Boomerang
We measure the detected version against Boomerang's release history and grade the surrounding stack with a Lighthouse-grade quality audit. Weak or outdated links weigh more - one risky dependency can pull the whole score down.
How the score worksMore technologies in RUM
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