← Chronos

Privacy Policy

Effective July 17, 2026

Chronos is a calendar application for iPhone and Mac, built and operated by Glenn Joseph ("we", "us"). Chronos is designed so that your data stays with you: the app has no backend servers, no user accounts of its own, no analytics, and no advertising.

What Chronos accesses

• Calendar data. With your permission, Chronos connects directly from your device to the calendar services you choose — Google Calendar, iCloud (CalDAV), and Microsoft 365 (Microsoft Graph) — to read and write your calendars and events, and to send responses to invitations you act on. This data flows directly between your device and the provider.
• Contacts. With your permission, Chronos reads your device's contacts locally to suggest attendees while you type. Contact data never leaves your device except as attendee email addresses you explicitly add to an event, which are sent to your calendar provider to deliver invitations.
• Location. With your permission, Chronos uses your approximate location to show local weather. Coordinates are sent only to the weather services below and are not stored by us.

Where your data lives

• Sign-in credentials (OAuth tokens, app-specific passwords) are stored in the device Keychain, on your device only.
• Calendar and event data is cached on your device so the app opens instantly. Removing an account, or deleting the app, removes this data.
• We operate no servers. We cannot see your calendars, events, contacts, credentials, or location — architecturally, they never reach us.

Google user data

Chronos's use and transfer of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements. Specifically: Google Calendar data is used only to display and manage your calendar inside the app at your direction; it is not transferred to anyone other than Google, not used for advertising, and not read by humans.

Third-party services

• Your calendar providers (Google, Apple, Microsoft) receive the calendar operations you perform and are governed by their own privacy policies.
• Apple Weather (WeatherKit) and Open-Meteo receive approximate coordinates to return forecasts.
• U.S. EPA AirNow receives approximate coordinates to return air-quality observations.
• Apple Maps is used to display event locations and suggest addresses as you type.

What we don't do

• No analytics, telemetry, or tracking of any kind.
• No selling, sharing, or transferring of your data.
• No data collection by us — there is nothing for us to retain or delete.

Revoking access

You can disconnect an account in Chronos's Settings at any time, which deletes its credentials and cached data from your device. You can also revoke Chronos's access from your provider: Google, Apple ID (app-specific passwords), or Microsoft.

Children

Chronos is not directed at children under 13 and collects no data from anyone.

Changes

If this policy changes, the updated version will be posted at this address with a new effective date.

Contact

Questions? Email chronosappsupport@gmail.com.