Quartz

Quartz is a Gmail client for Apple Silicon Macs that ranks mail by importance and drafts replies in the user's own voice, all with an on-device AI model so messages never reach AI providers. It is free during public beta.

Quartz is an email client for Mac that connects to Gmail and uses a locally running AI model to decide which messages deserve attention. It is currently in public beta. Instead of presenting one flat list, it sorts every incoming message by importance, using criteria the user defines and the app refines over time. Important mail is shown in full with a short AI summary, regular inbox items shrink to one-line entries, and lower-value groups called FYI, Icebox and Noise collapse out of view. The second pillar is drafting. A user supplies a few bullet points, and Quartz writes a reply meant to match their usual cadence, phrasing and level of warmth. According to the product description, it also takes into account the relationship with the sender and the context of the thread, which is aimed at avoiding the generic tone typical of general-purpose language models. Drafts appear through a reply button, with the original bullets kept visible beneath it. Privacy is the main differentiator. Classification and drafting run on the device itself, and the company states that it operates no servers that could read mail, so messages are not shared with AI providers. Mail is described as end-to-end encrypted with keys held only by the user, and the app has passed Google's CASA Tier 2 security assessment. The trade-off is hardware: the local model requires Apple Silicon, and the app is Mac only and Gmail only for now. The product suits professionals with high email volume who want triage and writing help but are uneasy about sending correspondence to cloud AI services. Among alternatives, it sits between traditional clients with rule-based filters and cloud-based AI inboxes that process messages on remote servers. Teams on Windows, mobile or non-Gmail providers will not be able to use it yet, and the beta status means features and pricing may change. During the beta, the app is free to use.