Seiun.

Privacy Policy

Seiun (seiun.one) is a free platform run as a private, non-commercial project. This page explains how it handles your account data. There are no ads, analytics or tracking, and your data is never sold or shared for marketing.

Who is responsible

Jakob Gschwendtner
Hartkirchen, Austria
Email: jakobgschwendtnerdev@gmail.com

Your Seiun account

Your account is a Seiun account, used for Seiun apps and services. This platform manages your account. Individual services describe their own data processing in their privacy policies.

What is stored, and why

  • Your account. Google provides your name, email address, profile picture and Google account ID. Sign-in tokens are stored encrypted to provide your account (Art. 6(1)(b) GDPR).
  • Sessions. Session tokens, IP addresses and browser information keep you signed in and help spot misuse (Art. 6(1)(b) and (f) GDPR).
  • Server logs. The hosting provider briefly logs the time, requested address and IP address to run and secure the service (Art. 6(1)(f) GDPR).
  • Contact emails. Your email address and message are kept as long as needed to answer. Data protection requests are kept for 3 years to document their handling (Art. 6(1)(c) and (f) GDPR). The contact address uses Gmail.

Cookies

The platform uses cookies for your sign-in session and light or dark theme preference. It does not store service content in your browser. The sign-in cookie is shared with Seiun apps on seiun.one addresses, so one sign-in works in all of them, and signing out of one signs you out of all of them.

Services used

  • Vercel Inc. (USA) hosts the platform.
  • Databricks, Inc. (USA), behind Neon, hosts the database in Frankfurt, Germany.
  • Google Ireland Limited provides sign-in. Google's privacy policy applies to your Google account.

Transfers to the USA rely on the EU-US Data Privacy Framework for Vercel and Databricks.

Retention and deletion

  • Your account is kept until you delete it in your account settings. Deleting it removes your account, linked sign-ins and sessions, and everything Seiun apps store with it, such as your notes in Seiun Notes. Files in your own Dropbox are not touched.
  • Sessions end when you sign out, or after 7 days without a visit.
  • Server logs are kept for 1 hour.
  • The database host keeps 6 hours of restore history; deleted data may remain in that history during this period.

Your rights

You can request access, correction, deletion, restriction or portability of your data by emailing jakobgschwendtnerdev@gmail.com. You can complain to the Austrian Data Protection Authority (Datenschutzbehörde, Barichgasse 40–42, 1030 Vienna, dsb.gv.at).

You may object to processing based on legitimate interests for reasons relating to your situation. Contact the address above. Processing then stops unless compelling legitimate grounds or legal claims require it (Art. 21 GDPR).

Your data is not used for automated decisions or profiling. Providing it is voluntary, but a Google sign-in is needed to use an account.

Changes

This policy changes when the platform does. Last updated: 12 November 2026.