Klar vs Rspamd
What actually differs: where each filter runs, who gets to read your mail, and what it costs.
| Aspect | Klar | Rspamd |
|---|---|---|
| Runs on | Your Mac | Your mail server |
| Who can read your mail | No one new during filtering. Classification stays on your device. | Runs on your own server. Mail stays on your infrastructure. |
| Works with | Apple Mail, with any account: IMAP, Gmail, iCloud, Exchange | Server-side, integrates with Postfix, Exim and other MTAs |
| Price | Free forever | Free and open source |
Klar fits better when You read mail in Apple Mail and don't run your own mail server
The honest picks
- Rspamd
- A fast, modern open-source filter for self-hosted mail: rich signals and scriptable rules, built for server operators. It filters at the server, not in your Mac's inbox. For a lightweight self-hosted layer, see Klar Pro.
- 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: rspamd.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.
