Privacy Policy

Your privacy is important to us. This Privacy Policy explains how we collect, use, and protect your information when you use our website and services.

1. Information We Collect

We collect the following types of information:

  • Account Information: When you create an account, we collect your email address and optional name. If you choose a password, it is stored securely using bcrypt hashing.
  • Authentication Data: We store session information and authentication tokens for secure access to your account.
  • Google Integration: When using Google authentication, we collect basic profile information provided by Google.
  • Access Management: We store information about allowed email addresses for spreadsheet access management.
  • Usage Data (only with your consent): Which pages you open and which buttons you click, your browser, device type and approximate location (country or city), and, if you are signed in, your internal account ID. Details are in section 5.

2. How We Use Your Information

We use the information we collect for the following purposes:

  • To provide and maintain your account, including email verification and secure authentication.
  • To manage access to Google Spreadsheets and control permissions for allowed users.
  • To process and manage your subscription status and access rights.
  • To communicate with you about your account, including verification emails and important updates.

3. Data Security and Storage

We implement several security measures to protect your information:

  • Password Security: All passwords are hashed using bcrypt before storage.
  • Email Verification: We require email verification to ensure account security.
  • Secure Authentication: We use NextAuth.js for secure session management and authentication.
  • Database Security: Your data is stored in a secure PostgreSQL database with proper access controls.

4. Your Rights

You have the following rights regarding your personal information:

  • Access and update your account information through your dashboard.
  • Manage your allowed email addresses and access permissions.
  • Update your credentials, including password and owner password.
  • Withdraw your consent to analytics at any time via “Cookie settings” in the footer. This does not affect processing that happened before you withdrew.

5. Cookies and similar technologies

We use cookies and similar local storage as described below. You choose whether optional analytics run in the cookie notice on your first visit. You can change or withdraw that choice at any time with “Cookie settings” in the footer of every page; withdrawing stops analytics immediately and deletes the analytics cookies from your browser.

  • Strictly necessary: We use session and security-related cookies (for example, via NextAuth.js) so you can sign in, stay authenticated, and use protected parts of the service. These are required for the site to work and are not used for marketing.
  • Optional analytics and performance: If you allow them in the cookie notice, we load PostHog, Vercel Analytics and Vercel Speed Insights. None of them are loaded before you accept or if you choose “Reject non-essential”. Legal basis: your consent (Art. 6(1)(a) GDPR and § 25(1) TDDDG).
  • PostHog (product analytics): helps us understand which features are used and where people get stuck. PostHog sets a first-party cookie (ph_…_posthog) holding a random ID so visits can be connected. It records page views, clicks, where on the page you click and how far you scroll (for heatmaps), and your browser, device and approximate location. If you are signed in, events are linked to your internal account ID; we do not send your email address or name. Email addresses on the page, passwords, form inputs and links containing secrets (for example invite links) are removed before anything is sent, and we do not record your screen. Data is sent through our own domain to PostHog’s EU data centre in Frankfurt, Germany, and is deleted after at most 12 months. Provider: PostHog Inc., 2261 Market St., #4008, San Francisco, CA 94114, USA, acting as our processor under a data processing agreement with EU Standard Contractual Clauses.
  • The site may also use your browser’s local storage for preferences (for example, theme) and UI state; this stays on your device and is not used to track you across other sites in the way optional analytics tools can be.

6. Third-Party Services

We use the following third-party services:

  • Google Services: We integrate with Google Sheets and Google Drive for spreadsheet access and management.
  • Stripe: We use Stripe for processing subscription payments.
  • PostHog: Product analytics, only with your consent (see section 5).
  • Vercel: Hosts this website. Vercel Analytics and Speed Insights run only with your consent (see section 5).

7. Changes to This Privacy Policy

We may update this Privacy Policy from time to time. Any changes will be posted on this page, and the "Last Updated" date will be revised accordingly.

8. Contact Us

If you have any questions about this Privacy Policy or your data, please contact us at support@kiartv.de.

Last updated: September 25, 2026