What we store — and what we don't.

Shoppers on datfit.net

Your height, weight, body shape and size choices stay in your own browser (localStorage key datfit:shopper:v1). They are never sent to our servers. Your language preference is stored as datfit:lang.

Shoppers on stores that use datfit

When you use the “Find my size” assistant on a store, your details are saved in your browser for that store only (datfit:profile:v1) so you don't have to re-enter them. They are not sent to datfit or to the store.

The widget sends anonymous counts to datfit so the store can see how helpful it is: “button viewed”, “assistant opened”, “size recommended” and “size selected”. These counts contain no measurements, no names, no cookies and no device identifiers.

Merchants

• Account: your email and a scrypt hash of your password (we never store the password itself).
• Session: an HttpOnly cookie (datfit_msid) that keeps you signed in.
• Stores: store name, website, platform, widget settings, custom size charts, install status and the anonymous daily counts above.
• Payments: method, amount, status and date. For InstaPay we keep the transfer screenshot you upload so we can verify it. Card payments are processed by Polar — we never see your card details.

What we don't do

• No advertising, no tracking pixels, no selling or sharing of data.
• No third-party analytics on shoppers.

Hosting

datfit runs on Railway. Like any website, our hosting receives standard request data (IP address, user agent, requested URL) as part of normal operation; we don't use it to profile anyone.

Deleting your data

Shoppers: clear site data for datfit.net, or for the store where you used the assistant. Merchants: email hello@datfit.net from your account email and we'll delete your account, stores and receipts.

Last reviewed: 15 September 2026.