CLID |
To distinguish the first visitor seen on the website and associate their actions with a single Clarity user ID |
When the page loads on the first visit |
1 year |
Clarity user ID, number of page views, links |
Microsoft Clarity servers |
ga* |
GA4 session status: counts page views and maintains session |
On first visit, when the Google Analytics tag loads |
1 year 1 month 4 days |
Randomly generated user ID, session tags, page views |
Google Analytics servers (EU/US) |
_ga |
GA4 primary identifier to distinguish unique visitors |
On the first visit |
1 year 1 month 4 days |
Unique user ID, number of sessions |
Google Analytics servers |
_clck |
Save Clarity’s user ID and its settings so that the same visitor is recognised on subsequent visits |
When the page loads |
1 year |
Clarity ID, link to previous sessions |
Microsoft Clarity servers |
_clsk |
Merge multiple page views into a single Clarity session record |
When a page loads |
1 day |
Internal session key, page links |
Microsoft Clarity servers |
SM |
Synchronise MUID identifier between Microsoft domains |
When page loads |
Session |
MUID, browser identifier |
Microsoft domain servers |
MUID |
Unique Microsoft visitor ID used for analytics and advertising |
When the page loads |
1 year 24 days |
MUID, browsing history, IP address |
Microsoft Bing/Clarity servers |
MR |
Indicate if MUID needs to be updated; internal analysis |
After the page loads |
7 days |
Link to MUID, session timestamp |
Microsoft Clarity or Bing servers |
SRM_B |
Unique ID for advertising purposes; helps to display personalised ads |
When the page loads |
1 year 24 days |
Visitor ID, ad clicks |
Microsoft Ads/Bing servers |
ANONCHK |
Check Bing ad clicks and session ID |
When a Bing ad is clicked or on the first visit |
10 minutes |
Session ID, ad click attribution |
Microsoft servers |
crisp-client* |
Ensure chat functionality and chat history preservation |
When the page loads / Crisp Chat widget loads |
6 months (default) |
Unique chat ID, content of previous messages |
Crisp platform servers |
_cfuvid |
Cloudflare/Calendly speed and security cookie: differentiates between visitors sharing the same IP, applies traffic limitation |
When a page loads via CDN |
Session |
IP address, anonymous session key |
Cloudflare or Calendly servers |
warmly_fingerprint |
Identify and enrich anonymous visitor data for sales/marketing purposes |
When the page loads after the Warmly script is loaded |
Permanent (until visitor deletes) |
IP, browser fingerprint, UTM parameters, URL |
Warmly servers (USA) |
MediaStore-client |
Local Webflow object – stores temporary media states |
When the page loads with the appropriate widget |
Unlimited (Local Storage) |
Controller state, temporary settings |
In the visitor’s browser (Local Storage) |
WidgetStore |
Stores chat/controller settings to keep preferences between pages |
When page loads |
Unlimited (Local Storage) |
Widget layout and display settings |
In the visitor’s browser |
ClientSessionStore |
Maintain chat session between page loads |
After page load |
Unlimited (Local Storage) |
Session key, last message stamp |
In the visitor’s browser |
_cltk |
Internal Clarity marker used for page text collection for Heatmap functions |
When the page loads |
Session |
Random session ID |
Microsoft Clarity servers |