Legal
Who else touches it
This is what each of them sees. Nobody buys a tool like this without asking, so the answer is a page rather than an email you have to send.
Last updated 21 August 2026
01
The list
| Company | What it does | What it sees | Where |
|---|---|---|---|
| Supabase | Database, authentication, storage | Your email address and authentication record; the sites and scans you asked for; finding fingerprints; the rate-limit counter. | United States |
| Vercel | Hosting and content delivery | Requests to kithe.day as any web host does: IP address, user agent, and the path requested, held in operational logs. We do not run analytics on top of it. | United States, with edge delivery worldwide |
| Cloudflare | Content delivery, and page-view counts | Requests to kithe.day, as any content delivery network does. Its analytics counts page views without setting a cookie and without an identifier that follows anybody between visits or between sites. | Edge delivery worldwide |
| Anthropic | The judgement tier, on paid plans only | Individual images from your site and the sentences around them — never a whole page, never anything about your visitors. Free and anonymous scans send nothing at all. | United States |
02
The one worth reading twice
Anthropic is the only processor that sees anything from your website rather than about your account, and it only sees it on a paid plan. What is sent is an individual image and the sentences immediately around it — never a whole page, and never anything about the people who visit you, because Kithe has no access to that and no script on your site through which it could get any.
The mechanical checks never leave our own machines. That is why an image with no alt attribute at all costs nothing to find: it is a rule’s answer, settled before anything is sent anywhere.
03
What is not on this list
No advertising network, no data broker, and nothing that follows a visitor between sites. The page-view counts named above set no cookie and build no profile. The list is kept current as the product changes.
04
Changes
This page is part of the privacy policy. The date at the top is the date of the current list.