Klar vs SpamBull
What actually differs: where each filter runs, who gets to read your mail, and what it costs.
| Aspect | Klar | SpamBull |
|---|---|---|
| Runs on | Your Mac | SpamBull's cloud, in front of Exchange Server, Exchange Online or any POP/IMAP mailbox |
| Who can read your mail | No one new during filtering. Classification stays on your device. | Filters mail before it reaches your mail server, and keeps a copy so mail keeps flowing if that server goes down |
| Works with | Apple Mail, with any account: IMAP, Gmail, iCloud, Exchange | Organizations on Exchange, Microsoft 365 or POP/IMAP |
| Price | Free forever | Per-mailbox subscription (quote); no published tiers |
Klar fits better when you're an individual on Apple Mail, not an organization routing mail through a managed gateway
The honest picks
- SpamBull
- A cloud gateway for organizations, not related to the similarly-named Spam Bully (a different company). Point your MX records at SpamBull and it filters mail before your own server sees it. A continuity mode keeps mail flowing even if that server goes down. Aimed at IT admins running Exchange or POP/IMAP for a company, not individuals reading their own 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: spambull.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.
