Cossi: AI Chief of Staff
Brief. Prep. Book. Private.
About
This AI assistant proactively manages your schedule, communications, and relationships. It provides daily briefs, meeting preparation, and helps schedule appointments, all while prioritizing your privacy with on-device processing.
What's New in Cossi
1.9.5
July 20, 2026
Pair your Mac. Cossi Desktop is now available on macOS as a companion for your morning brief, meeting prep, and weekly review. Open Settings → Devices → Pair Mac to scan the QR on your desktop. Under the hood: post-quantum handshake (ML-KEM-768 + ML-DSA-65), session-word verification so both devices confirm identity, and everything happens on your local Wi-Fi with no relay involved.
MoreSubscription plans
Cossi Pro Monthly
Private AI Chief of Staff. On-device.
Developer apps
FAQ
What is Cossi?
Cossi is a private AI Chief of Staff that runs entirely on your phone. It proactively manages your calendar, inbox, and relationships to tell you what matters before you ask.
Does Cossi have ads?
No, Cossi is ad-free. The app emphasizes privacy with zero telemetry, zero ads, and zero tracking.
What are the subscription options for Cossi Pro?
Cossi Pro offers two subscription plans: Cossi Pro Monthly at $7.99 per month and Cossi Pro Annual at $59.99 per year.
How does Cossi ensure privacy?
Cossi runs AI on-device, meaning your prompts never touch a server. It also features an AES-256-GCM encrypted vault and post-quantum authentication.
What features are included in the free version of Cossi?
The free version of Cossi includes the morning brief, chat functionality, calendar integration, task management, an encrypted vault, and post-quantum security.
How often is Cossi updated?
The latest version of Cossi is 1.6.0, which was last updated on June 27, 2026. Updates are frequent to enhance features and reliability.
What devices does Cossi support?
Cossi is available on iPhone, iPad, and iPod. It is designed for iOS devices.
What is the age rating for Cossi?
Cossi has an age rating of 4+, making it suitable for a wide range of users.