Sentry

Functional

Sentry loaded on 146 sites in our October 2026 scan: 6% of the 2,450 most-visited sites we checked, before any visitor had given consent.

Category: Functional. A company can do several jobs; this is its main role on the pages we saw.

On 59% of the sites where it loaded, a consent banner was already present but hadn't been answered yet. It's especially common on .com.br sites: 9% of them load it, versus 6% of all sites we scanned.

About Sentry

Sentry is an application-monitoring tool used by developers to catch and diagnose errors and performance problems in their own code, not a company most visitors will have heard of.

Its script, usually loaded from sentry-cdn.com, sits quietly and only sends data to Sentry's servers when the page throws an error or a performance threshold is crossed, reporting a stack trace back to the site's own developers. It sets no cookies and isn't counted as a tracker here, since it exists to catch bugs, not to profile visitors.

Often loaded alongside

Sites that load Sentry most often also load Google Analytics (65%), Google (52%), Google Ads (52%), OneTrust (32%), and Cloudflare Web Analytics (29%).

Domains it loads from

browser.sentry-cdn.com
o209747.ingest.us.sentry.io
sentry.io
js.sentry-cdn.com
o13855.ingest.sentry.io
o55978.ingest.us.sentry.io
o433621.ingest.sentry.io
js-de.sentry-cdn.com
o293668.ingest.us.sentry.io
o22381.ingest.sentry.io
o248881.ingest.sentry.io
o4504501031403520.ingest.us.sentry.io
o13027.ingest.sentry.io
o4510675591430144.ingest.us.sentry.io
o315582.ingest.sentry.io
o350427.ingest.sentry.io
o109687.ingest.sentry.io
o109687.ingest.us.sentry.io
o1109393.ingest.us.sentry.io
o19233.ingest.us.sentry.io
o363271.ingest.us.sentry.io
o168728.ingest.sentry.io
o245151.ingest.us.sentry.io
o4504695552606208.ingest.sentry.io
o4507702880894976.ingest.us.sentry.io

Sites that load Sentry

The highest-ranked 30 of 146 sites.

roblox.com0 tracking companies
spotify.com1 tracking company
epicgames.com1 tracking company
tumblr.com0 tracking companies
applovin.com8 tracking companies
canva.com1 tracking company
amplitude.com5 tracking companies
mi.com2 tracking companies
dropcatch.com2 tracking companies
supercell.com0 tracking companies

Show 20 more sites

substack.com0 tracking companies
markmonitor.com1 tracking company
squarespace.com1 tracking company
digitalocean.com3 tracking companies
braze.com4 tracking companies
klaviyo.com4 tracking companies
atlassian.com0 tracking companies
onetrust.com2 tracking companies
wix.com0 tracking companies
sophos.com3 tracking companies
bandcamp.com1 tracking company
bugsnag.com2 tracking companies
box.com8 tracking companies
zillow.com4 tracking companies
allaboutcookies.org7 tracking companies
mixpanel.com2 tracking companies
prnewswire.com13 tracking companies
pexels.com4 tracking companies
jetbrains.com3 tracking companies
qualtrics.com7 tracking companies

Understanding this page

What the tracker categories mean
What "advertising," "analytics," "social," "consent" and the rest actually mean for a company or a cookie, and how CookieTosser decides which one applies.
First-party vs third-party cookies (and why "first-party" still tracks you)
What the distinction actually means technically, why browsers only block one of the two, and how CNAME cloaking, server-side tagging and cookies like _ga let sites keep tracking under their own domain.
How to block or limit trackers
Browser privacy settings, content blockers, Global Privacy Control and clearing cookies compared honestly — what each one actually stops, what it doesn't, and what it costs you in return.