About this policy
This Cookie Policy applies to centrus.ai (opens in a new tab) and the Centrus application. It was last updated on 16/10/2026.
In the UK, cookies and similar technologies are regulated by the Privacy and Electronic Communications Regulations (PECR), as updated by the Data (Use and Access) Act 2025, and by UK GDPR where personal data is involved.
We tell you what we use and why. Where consent is required, it has to be a clear positive action. Continuing to browse is not consent. Where the law allows storage without consent, as it does for statistics that help us improve our own website, we tell you clearly and you can turn it off easily and for free.
What we use
We use cookies and similar technologies in these categories.
Necessary. Needed for the website or application to work: loading the service, keeping you signed in, completing a payment you have asked for, and remembering a cookie choice so we do not ask on every page. These do not require consent.
Appearance. Remembers whether you picked light or dark mode. It stores a choice you made, so it is treated as strictly necessary and needs no consent. It does not identify you and is not used for advertising.
Analytics. Optional. We use Google Analytics 4 to see which pages people read and how they find us, so we can improve the site. If you are in the UK, it runs from your first visit and a notice tells you how to turn it off. UK law allows this for statistics that improve our own website, as long as we explain it and you can object (PECR Schedule A1, added by the Data (Use and Access) Act 2025). Everywhere else, it only loads after you select Accept analytics, or turn it on in Manage cookie settings. We tell whether you are in the UK from your device’s time zone setting, not by looking up your IP address. If you turn analytics off or reject it, it stops and the site works the same.
We do not use cookies to show you third-party advertising, and we do not sell cookie data. Tools you choose to connect (for example when you sign in to another product through Centrus) may set their own cookies under that provider’s notices.
The cookies we set
These are the cookies and browser storage the website uses. The Google Analytics cookies and the analytics storage are only set while analytics is on.
centrus_consent
- Category
- Necessary
- What it does
- Remembers whether you turned analytics on or off, so we do not ask on every page
- How long it lasts
- 6 months
theme
- Category
- Appearance (necessary)
- What it does
- Remembers light or dark mode. Held in your browser’s local storage and never sent to us
- How long it lasts
- Until you clear it
_ga
- Category
- Analytics (optional)
- What it does
- Google Analytics: tells one visitor from another
- How long it lasts
- 2 years
_ga_<ID>
- Category
- Analytics (optional)
- What it does
- Google Analytics: keeps track of the current visit
- How long it lasts
- 2 years
centrus_attribution
- Category
- Analytics (optional)
- What it does
- Remembers the campaign tags, referring site and first page of your visit, so a form you send shows how you found us. Held in session storage
- How long it lasts
- Until you close the tab
centrus_demo_prefill
- Category
- Necessary
- What it does
- Carries the email address and name you typed to the demo form, so you do not type them twice. Held in session storage
- How long it lasts
- Until the demo form opens, or you close the tab
centrus_internal
- Category
- Analytics (staff only)
- What it does
- Marks browsers used by Centrus staff, so their visits are left out of our figures. Held in local storage. Visitors never receive it
- How long it lasts
- Until cleared
centrus_ga_debug
- Category
- Analytics (staff only)
- What it does
- Lets our team check that analytics is working, from a test link. Held in session storage
- How long it lasts
- Until you close the tab
centrus_admin_session
- Category
- Necessary
- What it does
- Keeps Centrus staff signed in to our internal tools. Visitors never receive it
- How long it lasts
- 5 days
centrus_admin_sidebar
- Category
- Necessary
- What it does
- Remembers the sidebar layout in our internal tools. Staff only
- How long it lasts
- 1 year
Our tag does not set the older Google Analytics cookies (_gid and _gat). If your browser has them from an earlier visit, they are removed when you turn off, reject or withdraw analytics. The Centrus application at app.centrus.ai (opens in a new tab) sets its own necessary cookies to keep you signed in.
How to control cookies
When you first visit from the UK, a notice explains that we use Google Analytics and lets you turn it off in one click. Everywhere else, a banner asks whether you accept analytics. Rejecting is as easy as accepting, and nothing optional runs until you choose. We ask again after 6 months.
To change your mind, use the Manage cookie settings button below or at the top of this page. If you turn analytics off or withdraw consent, it stops straight away and we delete the Google Analytics cookies and analytics storage from your browser. You can also email support@centrus.ai.
You can also control cookies in your browser. Blocking all cookies may affect sign-in to the application. You can usually still read the public website.
Privacy
Where these technologies involve personal data, UK GDPR applies as well as PECR. How we handle personal data is set out in the Privacy Policy.
Changes
We will update this policy if how we use cookies changes. If we introduce a new optional purpose, we will tell you before using it, and ask for consent where the law requires it.
Contact
Questions about cookies: support@centrus.ai. How to complain is set out in the Privacy Policy.
Looking for how the platform is built and certified, or another policy?