A private alternative to Mailinblack
Klar filters spam on your Mac, inside Apple Mail. No account, no cloud, nothing to hand over.
If you are weighing up Mailinblack, here is how Klar differs and where each one is the better pick.
| Aspect | Klar | Mailinblack |
|---|---|---|
| Runs on | Your Mac | Mailinblack's cloud, or an on-premise gateway |
| Who can read your mail | No one new during filtering. Classification stays on your device. | Analyzes your organization's mail in its cloud to filter it |
| Works with | Apple Mail, with any account: IMAP, Gmail, iCloud, Exchange | Your organization's mailboxes, in front of the mail server |
| Price | Free forever | Per-mailbox subscription (quote) |
Klar fits better when You're an individual on Apple Mail, not an organization buying a managed gateway
What to check before you connect Mailinblack
- New senders are asked to prove they are human
- Mailinblack's Protect product can hold a first-time sender's message and reply asking them to click a link confirming they are human. Only then is the mail delivered and the contact created. We received one in August 2026 after writing to a company that uses it, and the letter sat undelivered until someone clicked. It stops automated mail. It also stops the person writing to you for the first time, who gets an extra step while you hear nothing until they take it. Klar has no gateway and never holds anyone's mail: it classifies what has already arrived, on your Mac, so nobody who writes to you is asked to prove anything.
The honest picks
- Mailinblack
- A French email security service for organizations. It filters mail at the gateway, runs fake phishing attacks to train staff, and gives admins a console. Aimed at companies, not individuals reading mail in Apple Mail.
- Klar
- Pick Klar if you read mail in Apple Mail and want a modern multilingual model that runs entirely on your Mac. No account, no cloud, nothing to hand over.
Product and price details from the vendors' public pages, July and August 2026: mailinblack.com. Klar is not affiliated with any vendor named here. No vendor endorses Klar. Product names only identify the tools.
Reclaim your inbox
Spam filter for Apple Mail. Free on the App Store.
