Essential
Keeps sessions, anonymous onboarding, admin auth, and consent storage working. These cookies are required for the service to function.
Privacy controls
Cookies & preferences
This page explains the cookies we set, the third-party services we may use, and the choices you can change at any time. Essential cookies keep the product working; optional cookies can be switched off here.
Cookie dictionary
These are the cookies we set directly. Essential cookies stay on because the site needs them to function.
| Cookie | Category | Purpose | Duration |
|---|---|---|---|
| zk_session Zelkai Trends |
essential | Keeps you signed in during an authenticated session. Log in and account recovery. |
30 days |
| zk_vid Zelkai Trends |
essential | Keeps the temporary anonymous account stable across pages. Anonymous onboarding and session continuity. |
1 year |
| zk_anon_optout Zelkai Trends |
essential | Remembers that the temporary anonymous account was removed. Prevents the onboarding account from being recreated automatically. |
30 days |
| zk_admin Zelkai Trends |
essential | Keeps operator access active on admin routes. Admin session protection. |
1 day |
| zk_slack_state Zelkai Trends |
essential | Protects the Slack connect flow from CSRF. OAuth state check for Slack alerts. |
10 minutes |
| zk_social_state Zelkai Trends |
essential | Protects social sign-in flows from CSRF. OAuth state check for social login. |
10 minutes |
| zk_cookie_consent Zelkai Trends |
essential | Stores your cookie choices so we can respect them on later visits. Remembers consent decisions. |
180 days |
| zk_watch Zelkai Trends |
preferences | Saves watchlist topics in this browser. Watchlist persistence. |
1 year |
| zk_streak Zelkai Trends |
preferences | Remembers the daily return streak badge. Daily streak persistence. |
1 year |
| zk_ref Zelkai Trends |
measurement | Remembers the referral code that brought a visitor here. Affiliate attribution for signups and billing conversions. |
30 days |
Third-party services
These services can appear when you open a flow that depends on them. We name them here so the choice stays clear.
| Service | Domains | Why it is used | Appears in |
|---|---|---|---|
| Cloudflare Turnstile | challenges.cloudflare.com |
Bot protection on sign-up and log-in forms. Cloudflare may use provider-managed storage or cookies during the challenge flow. |
/signup and /login forms. |
| Stripe | api.stripe.comcheckout.stripe.comjs.stripe.com |
Payment processing and billing recovery. Stripe-hosted payment surfaces may set provider cookies or browser storage while checkout is open. |
Billing restore flows. |
| YouTube privacy-enhanced embed | www.youtube-nocookie.com |
Optional video embeds on trend pages that include video sources. The privacy-enhanced embed reduces tracking, but playback can still use provider storage. |
Trend pages with embedded videos. |
| Slack | slack.com |
OAuth flow for alert delivery. Slack may set its own cookies in the provider window when a user connects alerts. |
Slack connect and callback flows. |
| Social login providers | accounts.google.comfacebook.cominstagram.comtwitter.comx.comtiktok.com |
Optional account sign-in through configured external identity providers. Provider login screens may use their own cookies or browser storage while the OAuth window is open. |
Only when a configured social login button is used. |
Preferences
Remembers saved topics and the streak badge so returning users do not lose their progress.
Measurement
Keeps affiliate attribution working when you use referral links or billing recovery flows.