Head to head
Klar vs Libraesva
What actually differs: where each filter runs, who gets to read your mail, and what it costs.
| Aspect | Klar | Libraesva |
|---|---|---|
| Runs on | Your Mac | Your organization's servers, or its cloud |
| Who can read your mail | No one new. Your mail never leaves the device. | Stays on your infrastructure when deployed on-premises |
| Works with | Apple Mail, with any account: IMAP, Gmail, iCloud, Exchange | Your organization's mail flow, in front of the mail server |
| Price | Free | Enterprise quote |
Klar fits better when You're an individual, or a small self-hosted server (Klar Pro milter)
The honest picks
- Libraesva
- An EU email security gateway for organizations that run their own mail: appliance, sandboxing, compliance tooling. It is not aimed at individuals.For a lightweight self-hosted layer, see Klar for servers.
- 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.
