Quartz

Quartz is an AI-native email client that runs entirely on your Mac. The model that sorts your inbox and drafts your replies runs locally on Apple Silicon — there are no servers, so neither Quartz nor anyone else can read your mail. It auto-categorizes every message by importance (learned over time), drafts replies that sound like you by learning your writing and the context of each thread, and collapses FYI, Icebox and Noise out of the way. Mail is encrypted on-device with keys only you hold. Featured on Product Hunt (June 17, 2026).