Privacy Policy
Aperio is an accessibility-first calendar, task and contact application for desktop and mobile (Android and iOS). This policy explains what data the app and this website process. In short: Aperio runs no server of its own and contains no analytics, advertising, tracking or crash reporting; your data stays on your device or in the accounts and storage you choose.
The German version under /de/privacy/ is the legally
authoritative one for an operator based in Germany.
Who is responsible
Section titled “Who is responsible”The controller for data processing in connection with this website and the Aperio application is:
Toni Barth · Robert-Koch-Str. 44 · 06110 Halle (Saale) · Germany Email: contact@toni-barth.online
What Aperio processes
Section titled “What Aperio processes”Aperio is local-first. Your calendars, tasks and contacts are stored on your device. Where you connect an external account (Google, iCloud/CalDAV, Microsoft/Exchange, Vikunja, Todoist, an iCal feed, or your device’s own calendar), Aperio communicates directly with that provider on your behalf to read and write only the items you ask it to. Aperio operates no server that receives, stores or relays your content.
Optional cross-device synchronisation runs over storage you choose (e.g. WebDAV, SFTP, Dropbox, Google Drive or a local folder) and can be end-to-end encrypted, so the sync storage never sees your unencrypted data.
Account credentials and OAuth tokens for the providers you connect are stored only on your device and are used solely to talk to those providers.
Mobile app permissions
Section titled “Mobile app permissions”The Android and iOS apps request only the permissions a feature needs, and only when you use that feature:
- Calendars / Reminders (
READ_CALENDAR/WRITE_CALENDARon Android, Calendar and Reminders access on iOS): only if you enable the built-in device calendar — to read and write the calendars and reminders already on your device. If you don’t use it, no calendar permission is requested. - Photos: only the single image you explicitly pick (e.g. a contact photo); the app has no bulk access to your photo library and the image is processed locally.
- Notifications: to show your reminders, which are scheduled locally on your device. There is no push server — no remote message ever reaches the app.
The app contains no analytics, no advertising SDKs, no tracking and no crash reporting, and it collects neither an advertising identifier nor your location.
Google user data
Section titled “Google user data”Aperio’s use and transfer of information received from Google APIs to any other app will adhere to the Google API Services User Data Policy, including the Limited Use requirements. Google data (calendar, tasks, contacts) is used only to provide the features you invoke in the app, is processed locally on your device, and is not sold, transferred or shared with third parties.
This website
Section titled “This website”This documentation site is served as static files via GitHub Pages. The host may process technical access data (e.g. IP address, user agent) in server logs as far as technically necessary to deliver the site; see GitHub’s Privacy Statement. This site sets no tracking cookies and embeds no third-party analytics. The on-page search runs entirely in your browser.
Your rights
Section titled “Your rights”Under the GDPR you have the right to access, rectification, erasure, restriction of processing, data portability and objection. To exercise them, contact contact@toni-barth.online. You also have the right to lodge a complaint with a data-protection supervisory authority.
Last updated: 18 July 2026.