What does customer.io track?
Before any consent, customer.io loaded 2 tracking companies and set 1 advertising or analytics cookie.
That's fewer tracking companies than most sites we scanned: 56% of the 2,450 sites we checked loaded more.
Scanned October 2, 2026 from Germany, loading customer.io once and clicking nothing. How we scan
- Tracking companies
- 2
- Tracking cookies
- 1
- Third-party hosts
- 7
- Cookies in total
- 5
Consent banner
The page loaded Cookiebot, a consent management platform. Everything below was recorded before anyone answered it. 2 tracking companies still loaded while it was unanswered.
Companies contacted before consent
1 of the 5 companies it contacted before consent were advertising companies.
- Google Ads2 requestsAdvertising
pagead2.googlesyndication.com
- Google Analytics6 requestsAnalytics
www.googletagmanager.com, region1.google-analytics.com
Other third parties (content delivery, consent, functional, unclassified)
Cookies set before consent
The longest-lived tracking cookie it set was ajs_anonymous_id, from Trustpilot, lasting about 12 months.
| Cookie | Purpose | Set by | Lasts |
|---|---|---|---|
| ajs_anonymous_id | Analytics | customer.io | 12 months |
| _cio_marketing_analytics | Unclassified | customer.io | 13 months |
| anonymous_id | Unclassified | customer.io | 30 days |
| cio_u_id | Unclassified | customer.io | 13 months |
| embed_url | Unclassified | customer.io | 30 days |
The page also wrote 15 keys to local storage, which works like a cookie but isn't sent with requests.
Understanding this page
- How to see which cookies and trackers a website loads
A hands-on walkthrough for checking what a site sets before you've clicked anything, using Chrome and Firefox's built-in tools, plus how CookieTosser automates the same check every month.
- What counts as valid cookie consent in the EU
The rules that actually govern cookie banners — the ePrivacy Directive, the GDPR consent standard, the Planet49 ruling, the strictly-necessary exemption, and what "reject" has to offer compared with "accept.
- Consent management platforms explained
What a CMP banner is actually doing behind the scenes, how the IAB's TCF standard and Google's Consent Mode v2 fit in, and why a banner being present is no guarantee that nothing loads before you answer it.