Cookie Policy
Last updated: 26 March 2026
What Are Cookies?
Cookies are small text files stored on your device by your browser when you visit a website. They help websites remember information about your visit - such as whether you are logged in - so you do not need to re-enter details on every page.
Cookies We Use
Yestercharts uses only the cookies strictly necessary to operate the service. We do not use advertising or cross-site tracking cookies.
| Name | Purpose | Type | Expires |
|---|---|---|---|
| sb-*-auth-token | Supabase authentication session token. Keeps you logged in across page loads. | Strictly necessary | Session / 1 hour refresh |
| sb-*-auth-token-code-verifier | PKCE code verifier for OAuth sign-in security. | Strictly necessary | Session |
| __vercel_live_token | Vercel preview deployment authentication (development only - not set in production). | Strictly necessary | Session |
We use no third-party advertising cookies, no analytics cookies, and no social media tracking pixels. If this changes in the future, this policy will be updated and you will be notified.
Local Storage
In addition to cookies, Yestercharts uses browser localStorage to store non-sensitive UI preferences (e.g., chart settings, selected contest type). This data never leaves your device and is not transmitted to our servers.
How to Control Cookies
Because we only use strictly necessary cookies (required for login), disabling all cookies in your browser will prevent you from using Yestercharts. You can still clear cookies at any time via your browser settings - this will sign you out.
Browser cookie management guides:
Changes
If we introduce new cookies (for example, analytics or personalisation features), we will update this page and, where required by law, ask for your consent before setting those cookies.
Contact
Questions about our cookie practices: privacy@yestercharts.com
Full data practices: Privacy Policy