Browser Monster Index · Open data
How UK websites track you, in numbers
Every check people run on Browser Monster adds to this dataset. We visit each homepage three times from London (doing nothing, clicking reject, clicking accept) and record what loads. Filter it, share the view, or download it.
3 published sites · latest check 24 Oct 2026 · How we check · Jump to the dataset
Sites in this view
3
average score 55/100
Tracking before any choice
33%
cross-site trackers loaded as the page opened
Seen after clicking reject
0%
of 2 sites where we could click reject
No free reject on the first screen
33%
including 0% that offered a paid option instead
Tracking companies per site
7.0
on average, across our three visits
Fingerprinting
33%
0% used session recording
Grades
How the 3 sites in this view scored
By sector
Average score; tap a sector to filter the whole page
Companies on the most sites
Share of sites in Supermarkets where each company was seen
- Seen before any choice
- Seen only later
Consent tools
Which cookie-banner platform sites in Supermarkets use
- OneTrust3
Where the data goes
Countries of tracker servers, from our checker in London (in Supermarkets)
Countries
Sites sending data to tracker servers there
- Ireland3 companies100%
- United States6 companies100%
- Canada2 companies67%
- Germany4 companies67%
- United Kingdom6 companies67%
| Consent tool | ||||||
|---|---|---|---|---|---|---|
| ocado.comSupermarkets | 43F | 4 | 1 | no button | — | OneTrust |
| aldi.co.ukSupermarkets | 50D | 10 | 0 | 0 | — | OneTrust |
| morrisons.comSupermarkets | 72C | 7 | 0 | 0 | — | OneTrust |
“Before choice” and “after reject” count cross-site tracking companies. Downloads include every column for the current filters.
These are observations from one location at one time, homepage only; ads and banners change between visits. Some requests after rejecting may be strictly necessary services. Nothing here is proof that a site broke the law. Sites appear once they’re on our list or two different people have checked them. Free to use for journalism, research and personal projects with credit to the Browser Monster Index; for commercial use, email hello@browsermonster.com.