You carry the context that runs the room — fifty stakeholders, ten open threads, a principal who needs to walk in ready. Cossi carries it with you. It notices what's drifting, drafts the outreach, and hands you tomorrow already prepared. Private by architecture — nothing leaves your device.
Free to start. Pro features from $9.99/mo.
You brief your principal every morning. You track fifty stakeholders. You know which decisions are stalled, which relationships are cooling, which promises are about to expire. It's all in your head — or in a cloud tool that would alarm any security officer if they saw what was inside.
Cossi runs the loop for you. Brief, prepare, act, remember, anticipate — quietly, on your device, so the principal's context never has to leave your phone. You keep the judgement. Cossi keeps the receipts.
Not a general AI. Not a task manager. A private intelligence layer for the specific, high-stakes job of being a Chief of Staff.
The people running the room can't afford to put their principal's context in someone else's cloud. Cossi is the first tool built for the person who actually carries it.
— Built for Chiefs of Staff who operate at the senior-most levels
Cossi was built for the people who handle the most sensitive professional data in any organisation. Your principal's calendar, their stakeholder relationships, their open decisions — none of it is transmitted to any server. The AI model runs on-device. The vault is AES-256-GCM encrypted, keyed from a 24-word seed phrase only you hold. Post-quantum authentication means your session is secure against future cryptographic threats.
Download tonight. Cossi runs the first loop while you sleep. Free to start. No cloud. No data leaves your phone.
It runs the loop. You run the room.
