Aster Calendar: Secure Planner

Aster Calendar is a private, encrypted calendar and planner for your Aster account. Every event is encrypted on your device before it syncs, so your schedule stays yours. There are no ads, no trackers, and no analytics in the app.

End-to-end encrypted events

- Each event is encrypted on your device with AES-256-GCM, including its title, time, location, notes, and guest list.

- Calendar names and colors are encrypted too, so the server stores only ciphertext.

- Nobody at Aster can read your schedule, scan it, or sell what is in it.

- Your encryption keys belong to your Aster account, so only your signed-in devices can open your events.

Plan your day, week, and year

- Switch between day, week, month, year, and agenda views, or set a custom view that shows a rolling number of days.

- Create repeating events with flexible recurrence rules, and edit one event or the whole series.

- Mark time as focus time, out of office, a task, or a working location.

- Search every event, jump to any date, and restore deleted events from the trash for 30 days.

- Color code your calendars and events, and show or hide each calendar with one tap.

Reminders that arrive on time

- Set default reminders for timed and all-day events, from the start time to a week before.

- When you allow exact alarms, reminders arrive at the minute you choose, even when the app is closed.

- Get notified only for events you accepted, and choose whether reminders play a sound.

Built for work and busy schedules

- Split the day view by calendar so work and family plans sit side by side.

- Set working hours and working days, and dim the hours outside them so your free time stands out.

- Add a secondary time zone beside the grid and a world clock for the cities you work with.

- Speedy meetings end five or ten minutes early so you have time between them.

- Time insights show how much of your week goes to meetings and focus time, and your busiest day.

- Set a default meeting link, location, duration, and availability for new events.

Bring your calendars with you

- Import events from any .ics file, and export one calendar or all of them to .ics at any time.

- Subscribe to a calendar by URL, such as a team schedule or a sports season, and it refreshes on its own.

- Add public holidays for your region and birthdays from your Aster contacts.

- Show day numbers from the Chinese, Hebrew, Hijri, Persian, or Indian calendar next to your own.

One account for mail and calendar

- Aster Calendar uses the same Aster account as Aster Mail, so you sign in once and your settings sync to every Aster app.

- Your calendar syncs across every device where you sign in.

- Lock the app with a PIN or biometrics, and turn on two-factor authentication for your account.

Private by design

- No ads, no trackers, no analytics, and no profiling.

- Your data is never sold, shared, or monetized.

- Our servers are located in Falkenstein, Germany, under strict GDPR and privacy laws.

- We publish a signed warrant canary and a transparency page.

Aster is run by a small, independent team, and we charge a fair price for paid plans so we can keep building private tools without ads or investors.

Links

Website: https://astermail.org

Privacy policy: https://astermail.org/privacy/

Support: hello@astermail.org

Privacy is a right, take it back!