Privacy Policy

Last updated: March 2026

Summary

Klar does not collect, store, or transmit any of your personal data. All email processing happens entirely on your Mac. We have no servers that receive your emails, no analytics that track your usage, and no way to access your inbox.

What Klar Does

Klar is a spam filter for Apple Mail that runs as a native Mail extension on macOS. When you receive an email, Klar’s machine learning model analyzes it locally on your device to determine whether it is spam. The classification result is used by Mail to move spam to your Junk folder.

Data We Collect

None.

  • Your emails are processed on-device and never sent to any server.
  • The ML model runs locally. No cloud API calls are made during classification.
  • We do not collect usage analytics, crash reports, or telemetry.
  • We do not use advertising or analytics cookies. The optional support chat sets a functional cookie so a conversation stays linked to you (see “Support Chat” below).
  • We do not use third-party advertising or analytics tracking scripts.

Data Storage

Klar stores the following data locally on your Mac in a sandboxed App Group container:

  • Classification database: A local SQLite database recording which emails were classified and the result. This is used to avoid re-classifying emails and to support the correction workflow. This data never leaves your device.
  • ML model files: The spam classification model, stored in the shared App Group container so both the extension and the app can access it.
  • User preferences: Your filtering sensitivity, spam action preference, and contacts whitelist setting, stored in shared UserDefaults.

Contacts Access

Klar can optionally access your macOS Contacts to whitelist emails from people you know. Contact email addresses are synced to a local database only. They are never transmitted off your device. You can disable this feature at any time in the app settings.

Network Access

The App Store version of Klar makes no network requests. It has no network access. Every classification happens on-device, on your Mac.

Third-Party Services

The App Store version of Klar does not integrate with any third-party services. No data is shared with third parties.

Children’s Privacy

Klar does not collect any personal information from anyone, including children under 13.

GDPR Compliance

Klar is made in the European Union and designed with privacy as a core principle. Since we do not collect or process any personal data on our servers, GDPR data subject rights (access, deletion, portability) do not apply. There is simply no data to access, delete, or port. All data remains under your control on your device.

Changes to This Policy

We may update this privacy policy from time to time. Changes will be posted on this page with an updated revision date.

Support Chat

Our website includes a live support chat from Crisp (Crisp IM SARL, France) so you can reach us with questions. The chat widget loads with the page and sets a functional cookie and browser identifier so a conversation stays linked to you. If you start a chat, Crisp processes the messages you send as a data processor on our behalf. We use it only for support, never for advertising or tracking. See Crisp’s privacy policy.

Contact

If you have questions about this privacy policy, contact us at support@klar.im.