Browser Monster Index · Open data
How websites track you, in numbers
Every check people run on Browser Monster adds to this public dataset. We open each homepage three times from London (doing nothing, clicking reject, clicking accept) and record what loads, so you see what a visitor in the UK sees. Banners and trackers can differ in other countries.
590 sites · latest check 27 Oct 2026 · CC BY-NC 4.0 · How we check
Tracking before any choice
76.2%
Seen after clicking reject
46.7%
No reject on the first screen
23.8%
Average score
47/100
Grades
How 21 sites in Travel scored
Companies on the most sites
Share of sites in Travel where each was seen
- Seen before any choice
- Seen only later
Where the data goes
Countries of tracker servers, seen from our checker in London (in Travel)
Consent tools
Cookie-banner platforms on sites in Travel
Over time
Daily snapshots in Travel
The dataset
Five linked tables, free to explore
Filter them, sort them, share the exact view, or download them. Every check adds a row.
- Sites21Open table →
- Companies53Open table →
- Countries13Open table →
- Consent tools5Open table →
- Sectors22Open table →
Most tracking seen in Travel
All 21 sites →| Site | Grade | Companies | Before choice | After reject |
|---|---|---|---|---|
| trainline.com | FHeavy tracking seen | 26 | 2 | 2 |
| nationalrail.co.uk | FHeavy tracking seen | 10 | 1 | 0 |
| realtimetrains.co.uk | FHeavy tracking seen | 29 | 5 | 1 |
| thetrainline.com | FHeavy tracking seen | 27 | 2 | 2 |
| gatwickairport.com | FHeavy tracking seen | 9 | 2 | 1 |
| jet2holidays.com | FHeavy tracking seen | 9 | 1 | 1 |
| hoseasons.co.uk | FHeavy tracking seen | 9 | 1 | 0 |
| parkdeanresorts.co.uk | FHeavy tracking seen | 8 | 1 | — |
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