Cookies and browser storage
Every cookie and storage key Deftro uses, what it is for, how long it lasts, and how to switch analytics off.
Version 2026-11-10 · Effective
1.In short
Deftro sets only the cookies it needs to sign you in and to remember a few choices, and keeps a few more choices in your browser's local storage. There are no advertising cookies and no third-party trackers, so there is no banner. Analytics is cookieless and can be switched off below.
3.Browser storage
These stay in your browser and are never sent to us.
| Name | What it is for | How long |
|---|---|---|
bv_theme | Light or dark theme. | Until you clear it |
bv_dismissed_announcement | The site announcement you closed. | Until you clear it |
bv_dismissed_maintenance | The maintenance notice you closed. | Until you clear it |
bv_saw_maintenance | That this tab saw a maintenance window, so it can tell you when it ends. | Until you close the tab |
bv_diff_layout | Side-by-side or unified version diffs. | Until you clear it |
bv:search:v1 | Your recent searches, on this device only. | Until you clear it |
bv:tour-seen:v1 | That you have seen the walkthrough. | Until you clear it |
bv:sponsor-nudge-seen:v1 | That you have seen the sponsoring hint. | Until you clear it |
bv:assistant-hint-seen:v1 | That you have seen the help assistant hint. | Until you clear it |
bv_analytics_off | That you switched analytics off, below. | Until you switch it back on |
A service worker also keeps the offline page and the site's static files in your browser's cache, so a page can load without a connection. Nothing about your account is kept there.
4.Analytics
Vercel Web Analytics counts page views and Vercel Speed Insights measures how fast pages load. Neither sets a cookie or follows you to other sites, and addresses are stripped of tokens before they are sent. The counts help us see which pages work, so the switch starts on; turn it off and this browser sends nothing. A browser that sends Global Privacy Control is treated as switched off.
5.Other sites' content
Profile pictures load from Google, GitHub or Cloudinary, and image uploads go straight to Cloudinary, so those companies see your IP address when your browser fetches from them. They set no cookies for us. See sub-processors.
6.Contact
Questions about cookies: sales@baton-vault.vercel.app. The privacy policy covers everything else we keep.