Press Kit

About Klar

Klar is an AI spam filter for Apple Mail. It runs entirely on your Mac: no cloud, no account, no data collection. It catches the spam that slips past Apple's junk filter, including AI-written scams and phishing, and learns from your corrections over time.

Key facts

Free AI spam filter for Apple Mail, on the Mac App Store.
Runs entirely on your Mac. No account, no cloud, and emails never leave the device.
Catches AI-written scams and phishing that keyword filters wave through.
Reads mail in 100+ languages, not just English.
Learns from your corrections, all on the device.
Local-first: no server ever touches your mail. Only the website and model downloads run on our servers, hosted in the EU.

Founder

Klar is built by Nicolas Ha, a software engineer with around ten years building large-scale messaging infrastructure and security for regulated systems. That work includes the platform behind a major news site (over a billion views a month), core components for a bank's licensing, and a message-broker SaaS he built and ran on his own. His view is simple: spam is a messaging problem and privacy is a security problem, the two things he has worked on for a decade. He is based in France and is backed by experienced entrepreneurs and technical advisors from the messaging and machine-learning world.

Technical details

Classifier: a multilingual transformer (XLM-RoBERTa) quantized to run on-device, paired with a fast local scorer.
On-device learning: your corrections train a small personal model on the Mac. Nothing is uploaded.
Three sensitivity profiles (Cautious, Standard, Aggressive) tune the balance between false positives and catch rate.
Klar Plus, in development: an optional paid companion that shows every decision, lets you correct it, and surfaces the on-device learning. It adds to the free app rather than replacing it, and Klar stays free.