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Open Klar and look at the header. A green Active pill and a spam filtered count mean the extension has been running. Read the pill as last-known activity rather than proof it is registered right now, because it stays green for 14 days after the last message Klar saw. The stronger signal is the date on the newest entry under Recent catches. If that is from the last day or two, Klar is working. If the newest catch is weeks old, or you see the setup card instead, the extension is not running. Switching it on takes two steps, and both are needed. Quit Mail with Cmd+Q and reopen it, then open any email. Mail only picks up the extension when it restarts, and only a real message starts it. Three other things explain a quiet inbox. Klar checks mail that arrives after you switch it on, not what is already there. Mail has to be running for Klar to see anything. And if your provider already filters spam on its own servers, there may be little left to catch. One last thing to check. For the first 30 days after install, Klar flags instead of moving: spam gets a red flag and clean mail a green one, and everything stays in the inbox. Flags in the inbox during that time mean Klar is working. After 30 days spam moves to Junk, unless you picked Flag in red yourself under Filtering Settings.

That message appears when Mail asked Klar to look at mail a number of times and Klar returned no result any of those times. The app shows how many times, and since when. Mail usually asks twice per email, so the number is larger than the number of emails. It is a count Klar measured on your Mac, not a guess: nothing was sent anywhere for Klar to know it. The fix in nearly every case is to quit Mail completely with Cmd+Q and open it again. Then send yourself a test email; the Klar app has a button for it. Opening an old message is not enough. Mail only starts Klar when new mail arrives, which is also why nothing happens the moment you restart it. The message clears by itself as soon as Klar checks something. Klar waits for several messages in a row with no result before saying this, so one unusual email will not trigger it. The count starts again whenever you update Klar. If it comes back after a restart, email contact@crisp.klar.im and include the number and the date the app shows.

No spam filter is perfect. If Klar flags a legitimate email, move it back to your Inbox or remove the flag to tidy up. In the free version this does not retrain the filter. Klar Plus does learn from your corrections and retrains on your own mail, on your Mac. To protect verified mail from a specific sender, turn on Trust my contacts in Settings and add them to your macOS Contacts. To report a mistake, find the message under Recent catches, mark it with ✗, then click Email report. Klar drafts an email with the original attached and a removable summary of the previous month’s local usage totals. You review, edit and send the draft yourself; delete the summary first if you do not want to share those totals. To report several at once, click Show more and mark each catch with ✓ or ✗ before clicking Email report. You can also attach the original yourself and write to incorrect@klar.im directly.

Not automatically. All classification happens locally on your Mac, and Klar has no network access. Only an Email report that you review and send from your own mail app can share a selected original, its diagnostic context and the removable usage summary. See our Privacy Policy for details.

Klar requires macOS 14 Sonoma or later, on Apple Silicon (M1 or newer).

Open Klar and go to the Settings tab. You can choose between Cautious (fewer false positives), Standard (balanced), and Aggressive (catches more spam) profiles.

Try quitting Mail completely (Cmd+Q) and reopening it. If that doesn’t work, restart your Mac. The extension should appear in Mail > Settings > Extensions. If it was listed before and has since disappeared, open the Klar app once, then quit and reopen Mail and open any message. That has restored it in the one case we have seen, and we are treating it as a bug rather than as normal behaviour. Note that while the extension was missing it was not checking anything, so mail that arrived in the meantime was never classified.

Klar checks new mail as it arrives in your Inbox. If your email provider moved a message to Junk before it reached your Mac, Klar never sees that message, so it can’t re-check it. Klar works on the mail that reaches your Inbox. To go through mail that is already in Junk, including good messages sent there by mistake, open Klar Plus. It scans your Junk folder and lets you move real mail back to the Inbox with one click.

For the most consistent results, let Klar be your only inbox filter. Open Mail > Settings > Junk Mail and turn off Enable junk mail filtering. Klar then decides what stays in your Inbox, so you don’t have two filters disagreeing. This only affects your Mac: mail your email provider already moved to Junk on its own servers is handled separately.

Yes. In Klar, open Settings and turn on Trust my contacts, allow Contacts access when macOS asks, then add the sender to your macOS Contacts. While the setting is on and access is allowed, Klar leaves verified mail from that address in your Inbox. It still checks an unverified message so a spammer cannot hide behind a contact’s address. Your contacts are read on-device only and never leave your Mac.

Because spam is written to beat word lists. A rule that blocks “invoice attached” blocks your accountant. A scammer only has to write “inv0ice” to get past it. Klar’s model reads meaning rather than spelling. It was trained on the shape of a message, so an urgent payment demand from a stranger looks the same to it in English, French or German. It also looks the same misspelled, or phrased in a way nobody has used before. That is why the free app has no rules to write and no language to set. The cost is that it is a judgement, not a certainty, which is why you can correct it. Klar Plus adds sender rules on top, for the few addresses you want decided by name rather than by judgement.

No. No third party has audited us, and we would rather say so than imply otherwise. Here is what does exist. Apple reviews the App Store build, which is where the sandbox and the app’s permissions are checked. Notarization means Apple scanned the build for known malware and knows who signed it. The check that matters most you can run yourself in a few seconds. The free app does not hold the macOS network permission at all. This post gives the command and explains what each guarantee covers. If your rule is to install nothing without a formal audit, that is a sound rule and we would rather you keep it.