Head to head
Klar vs Mailinblack
What actually differs: where each filter runs, who gets to read your mail, and what it costs.
| Aspect | Klar | Mailinblack |
|---|---|---|
| Runs on | Your Mac | Mailinblack's cloud, or an on-premise gateway |
| Who can read your mail | No one new. Your mail never leaves the 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 | Per-mailbox subscription (quote) |
Klar fits better when You're an individual on Apple Mail, not an organization buying a managed gateway
The honest picks
- Mailinblack
- A French email security service for organizations: gateway filtering, phishing simulation and security training, an admin 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 2026: c-command.com, sanebox.com, support.google.com, learn.microsoft.com, libraesva.com, spamassassin.apache.org, rspamd.com, mailinblack.com. Klar is not affiliated with or endorsed by any vendor named here; names are used only to identify the products.
The on-device option
Free, private, in Apple Mail.
