Alternative
A private alternative to SpamSieve
Klar filters spam on your Mac, inside Apple Mail. No account, no cloud, nothing to hand over.
If you are weighing up SpamSieve, here is how Klar differs and where each one is the better pick.
| Aspect | Klar | SpamSieve |
|---|---|---|
| Runs on | Your Mac | Your Mac |
| Who can read your mail | No one new. Your mail never leaves the device. | No one new. Processing stays on your Mac. |
| Works with | Apple Mail, with any account: IMAP, Gmail, iCloud, Exchange | Apple Mail, Outlook and other Mac clients |
| Price | Free | $39.99 one-time |
Klar fits better when Spam comes in several languages, or you don't want to train a filter
The honest picks
- SpamSieve
- A proven on-device filter with two decades of history. Pick it if you like Bayesian filtering you train yourself and want a mature indie tool. Klar takes a different bet on the model: a multilingual transformer instead of word statistics.
- 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.
