Cookie Policy
2026-07-19 • Version 1.1
1. What is a cookie?
A cookie is a small text file stored on your device (computer, tablet, smartphone) when you visit Serenzer. Cookies allow the site to recognize your device and remember your preferences. Serenzer uses cookies to enhance your user experience, analyze site usage, and personalize content.
2. Types of cookies used
We use four types of cookies: (1) Necessary cookies — essential to the operation of the site, including authentication, security and basic preferences. These cookies cannot be disabled. (2) Functional cookies — enhance the user experience by remembering your choices (language, display settings). (3) Analytical cookies — help us understand how you use Serenzer through anonymised statistics (pages visited, time spent, navigation paths). (4) Marketing cookies — not currently used by Serenzer. No advertising cookies are placed on our sites.
3. Third-party Cookies
Serenzer uses third-party services that may place their own cookies: OpenAI, Anthropic and xAI for the AI coaching service, Stripe for secure payments, and Google Analytics (Google Ireland Ltd.) for audience measurement on our showcase site serenzer.com. Google Analytics cookies are only placed after your explicit acceptance via our consent banner; if you decline, no data is transmitted to Google. These services have their own cookie policies, which we encourage you to consult.
4. Retention Period
The retention period varies depending on the type of cookie: Session cookies - deleted when you close your browser. Persistent cookies - retained for between 30 days and 13 months depending on their function. Analytical cookies - maximum of 13 months in accordance with GDPR. You can delete all cookies at any time from your browser settings.
5. Manage Your Preferences
You have full control over cookies: On our showcase site serenzer.com, via the 'Manage my cookies' link in the footer, which reopens the consent banner at any time. In your Serenzer account settings (Privacy section). Directly in your browser settings (Chrome, Firefox, Safari, Edge). Please note that disabling certain cookies may limit some features of the site. Necessary cookies cannot be disabled as they are essential to the operation of Serenzer.
6. Updates and Contact
This cookie policy may be updated periodically to reflect changes in our practices or to comply with legal developments. The date of the last update is indicated at the top of this page. In case of significant changes, we will notify you by email or through a notification on the site. For any questions regarding our use of cookies, please contact us at privacy@serenzer.com.