What does slack.com track?
Before any consent, slack.com loaded 6 tracking companies and set 5 advertising or analytics cookies.
That's more tracking companies than 83% of the 2,450 sites we scanned.
Scanned October 2, 2026 from Germany, loading slack.com/intl/en-gb once and clicking nothing. How we scan
- Tracking companies
- 6
- Tracking cookies
- 5
- Third-party hosts
- 19
- Cookies in total
- 13
Consent banner
The page loaded OneTrust, a consent management platform. Everything below was recorded before anyone answered it. 6 tracking companies still loaded while it was unanswered.
Companies contacted before consent
4 of the 12 companies it contacted before consent were analytics companies.
- Google Ads1 requestAdvertising
pagead2.googlesyndication.com
- YouTube11 requestsSocial media
www.youtube-nocookie.com, www.youtube.com
- Optimizely4 requestsAnalytics
logx.optimizely.com, cdn3.optimizely.com, a11179690159.cdn.optimizely.com
- Google Analytics2 requestsAnalytics
www.googletagmanager.com
- Clearbit (HubSpot)1 requestAnalytics
reveal.clearbit.com
- 6sense1 requestAnalytics
api.company-target.com
Other third parties (content delivery, consent, functional, unclassified)
- slack-edge.com140 requestsUnclassified
a.slack-edge.com
- mczbf.com2 requestsUnclassified
www.mczbf.com
- OneTrust11 requestsConsent banner
cdn.cookielaw.org, geolocation.onetrust.com
- Google3 requestsFunctional
fonts.gstatic.com, www.google.com, jnn-pa.googleapis.com
- Schema App3 requestsFunctional
cdn.schemaapp.com, data.schemaapp.com
- Amazon Web Services7 requestsContent delivery
d34u8crftukxnk.cloudfront.net
Cookies set before consent
The longest-lived tracking cookie it set was __Secure-ROLLOUT_TOKEN, from YouTube, lasting about 6 months.
| Cookie | Purpose | Set by | Lasts |
|---|---|---|---|
| __Secure-ROLLOUT_TOKEN | Advertising | youtube.com (third party) | 6 months |
| VISITOR_INFO1_LIVE | Advertising | youtube.com (third party) | 6 months |
| VISITOR_PRIVACY_METADATA | Advertising | youtube.com (third party) | 6 months |
| _b217933bd1334fb9c91de80c666a6696$$11179690159$… | Analytics | a11179690159.cdn.optimizely.com (third party) | 6 months |
| optimizelySession | Analytics | slack.com | 6 months |
| b | Unclassified | slack.com | 13 months |
| cjConsent | Unclassified | slack.com | 13 months |
| ui | Unclassified | slack.com | 12 months |
| utm | Unclassified | slack.com | 14 days |
| x | Unclassified | slack.com | Under a day |
| __Secure-YNID | Functional | youtube.com (third party) | 6 months |
| OptanonConsent | Functional | slack.com | 12 months |
| YSC | Functional | youtube.com (third party) | Session |
The page also wrote 9 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.