Cookies and Local Storage
Last updated: July 2026
This page explains what cookies and browser storage Gainzkeeper uses and why.
What Are Cookies?
Cookies are small text files stored in your browser. They allow a website to remember information about your visit, such as whether you are logged in.
Cookies We Use
Gainzkeeper uses only strictly necessary cookies, for signing in and demo mode. No advertising or tracking cookies are used. A few other features use browser local storage instead of a cookie, listed below.
| Name | Purpose | Type | Duration |
|---|---|---|---|
sb-[project]-auth-token | Supabase authentication session | Strictly necessary | Session |
gainzkeeper-demo | Maintains demo mode state | Strictly necessary | Session |
Local Storage
Local storage is not a cookie: it sits in your browser and is only read when Gainzkeeper asks for it, not sent along with every request the way a cookie is.
| Name | Purpose | Type | Duration |
|---|---|---|---|
ph_[project-key]_posthog | Anonymous analytics ID, so a repeat visit counts as one visitor rather than a new one each time | Analytics, no cookie | Until you clear browser storage |
gainzkeeper-theme | Remembers your light or dark preference | Preference | Until you clear browser storage |
gainzkeeper-lang | Remembers your language preference | Preference | Until you clear browser storage |
gainzkeeper-hide-amounts | Remembers privacy mode, which hides your amounts on screen | Preference | Until you clear browser storage |
No Advertising Trackers
We do not use Google Analytics with cookies, Facebook Pixel, or any other advertising tracker. The analytics ID above never follows you to other sites, builds no advertising profile, and is never sold or shared. Product analytics run through PostHog on EU servers; see our Privacy Policy for the full list of processors.
Managing Cookies and Local Storage
You can delete or block cookies, and clear local storage, in your browser settings. Blocking session cookies will prevent you from staying logged in to Gainzkeeper. Clearing local storage resets your theme, language, privacy mode, and analytics ID.
Changes to This Statement
We may update this statement as we add new features. The date of the most recent update is shown at the top of this page.