Klar

What is Klar?

Klar is a spam filter for Apple Mail that runs fully on your Mac. It checks messages as they arrive and moves spam and phishing into Junk automatically. The app is private by design: no account, no cloud, no telemetry, and your mail never leaves your device. It supports 100+ languages, works with iCloud, Gmail, Fastmail, Outlook, and custom IMAP, and stays fast because filtering happens in the background. Klar Plus adds a personal AI that learns from your corrections and can sort mail into Inbox, Marketing, or Junk.

Key features

• Filters incoming mail automatically in Apple Mail.
• Runs entirely on-device with no cloud access.
• Supports over 100 languages out of the box.
• Learns from your corrections instantly on your Mac.
• Works with iCloud, Gmail, Outlook, Fastmail, IMAP.
• Offers optional Klar Plus for marketing classification.