Klar: Spam Filter for Mail

Catches phishing, junk & scams

Only for Mac

Free

Mac

Klar is an AI spam filter for Apple Mail that runs entirely on your Mac. No cloud, no automatic telemetry, no account required. It catches the phishing, scam, and junk emails that Mail's built-in filter misses, using a multilingual transformer model fine-tuned on millions of real emails. HOW IT WORKS Klar installs as a Mail extension. Once enabled in Mail > Settings > Extensions, it classifies every incoming email automatically and moves spam to Junk. You decide when that starts. For your first 30 days Klar flags spam in red and leaves it in your inbox, so you can see what it catches before trusting it; after that it moves spam to Junk on its own. It is a setting, so you can switch either way whenever you like. The ML model runs locally on your Mac. No email is uploaded for classification. A report leaves only when you send its editable draft yourself. FEATURES - Real-time spam classification as emails arrive - Multilingual: the model handles emails in any language automatically - Optional Contacts whitelist: turn it on to keep verified mail from known senders in your inbox - You decide what happens: move spam to Junk or flag it in red, and flag clean mail in green if you want to see the filter working - A dashboard that shows how much mail Klar has been through and what it caught - Zero network access: the extension has no network entitlement PRIVACY Klar is private by design. The extension is fully sandboxed with no network access. Your email content is processed on-device and Klar sends nothing automatically. No automatic telemetry, no account. If you choose Email report, Klar opens a draft in your mail app for you to review, edit and send yourself. The draft includes a removable summary of the previous month's local usage totals.

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A new detection model, trained on more real mail. - On our test mail it flags about a third fewer legitimate emails and catches more than twice as much spam as the previous model, while using a quarter less memory. - It now catches the fake "your Prime trial is ending" notices that open the fake-bank-adviser scam, in French as well as English. - Spam that reaches your Inbox never shows up on the dashboard, so the dashboard now says so and tells you how to forward one to us. - A small card asks whether you enjoy Klar. Yes takes you to the App Store; not really takes you to us. - Clearer German and French labels.

The developer, Nicolas HA, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Seller
    Nicolas HA
    Size
    302.8 MB
    Category
    Utilities
    Compatibility
    Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    Languages
    English and 2 more
    • English, French, German
    Age Rating
    4+
    Copyright
    © 2026 Nicolas HA