Privacy

Data storage

Entries are stored as JSON files in your Application Support directory, with local backups written to disk alongside them.

Network access

Aion opens no network connections of its own. Some integrations ask macOS to reach the network.

Activity records

Aion keeps a local record of the commands you use, the searches you submit, and the days you open. It never leaves your Mac.

Third-party dependencies

None. Aion is built entirely on Apple frameworks: SwiftUI, AppKit, CoreLocation, MapKit, EventKit, Contacts, Photos, UserNotifications, NaturalLanguage, and CloudKit.

iCloud backup

Aion can mirror your diary to your own private iCloud database through Apple’s CloudKit. The mirror is one-way, and the copy sits in your iCloud account, where the developer cannot read it.

Location

Aion can use CoreLocation to suggest your current city for today’s entry. It first matches your position against a list of cities held inside the app, which needs no network. Further out, macOS looks the name up, which sends the coordinate to Apple. The city can also be typed.

Contacts

With Contacts Birthdays turned on, Aion reads birthdays and names so it can show them on the Calendar. It is read-only.

Photos

Aion writes images you export and never reads your library.

Apple Reminders

Mirroring a reminder to Apple Reminders goes through the system EventKit framework and stays between Aion and macOS. Reminders work without it.

Notifications

Aion posts notifications for its own reminders and nothing else.

Search by meaning

Aion can find entries that mean something similar to the one you are reading. It runs on your Mac using Apple’s on-device language model, and the index it builds is stored beside your diary and never uploaded. If your Mac does not already hold that model, macOS downloads it once. Nothing from your diary goes with it.