Privacy Policy

Hemera Last updated: April 7, 2026

Overview

Hemera is a companion app for Home Assistant. It connects directly to a Home Assistant server that you provide and control. We do not operate any servers or services on your behalf.

Hemera is open source under the MIT License — you can review the source code to verify these privacy claims yourself.

Data Collection

Hemera does not collect, store, or transmit any personal data to us or any third party.

Network Communication

All network communication occurs exclusively between your device and the Home Assistant server you configure. This includes:

• WebSocket connections for real-time device state updates
• REST API calls for retrieving area and entity information
• Service calls for controlling your smart home devices

No data from these communications is sent anywhere other than your own Home Assistant instance.

Local Storage

Hemera stores the following data locally on your device:

• Your Home Assistant server URL and authentication token (stored securely in the device Keychain)
• Entity and area data synced from your Home Assistant instance
• Your dashboard layout preferences

This data never leaves your device except to communicate with your Home Assistant server.

Third-Party Services

Hemera does not integrate any third-party analytics, advertising, or tracking services.

Tracking

Hemera does not track you across other apps or websites.

Children’s Privacy

Hemera does not knowingly collect any information from children.

Changes to This Policy

If this policy is updated, the revised version will be posted here with an updated date.

Contact

If you have questions about this privacy policy, contact us at hemera.app@proton.me.