Everything you need to cover Cossi — positioning, boilerplate, product facts, technical facts, founder bio, and media assets.
Cossi is not an assistant, a note-taker, or a productivity app. It's a Chief of Staff — an AI that runs a five-step loop on your phone every day (brief, prepare, act, remember, anticipate) so your life is already handled by the time you wake up. Private by architecture.
Cossi is the AI Chief of Staff that runs a loop for you — private by architecture, on your device.
Most AI waits for you to prompt it. Cossi runs a five-step loop — brief, prepare, act, remember, anticipate — quietly, every day, on your device, so your calendar, relationships, and commitments are already handled by the time you wake up.
Cossi is an AI Chief of Staff for knowledge workers, available on iOS and Android. Unlike cloud-based AI tools that wait for a prompt and require users to upload their calendar, email, and contacts to a remote server, Cossi runs continuously on the user's device — noticing what's changed, preparing them for what's next, and handling the follow-through. Its five-step loop (brief, prepare, act, remember, anticipate) executes daily against local calendar, contact, email, and commitment data. The AI model (llama.rn + DeepSeek R1 1.5B) runs entirely on-device. Authentication is post-quantum (ML-DSA-65 / CRYSTALS-Dilithium), and vault storage is AES-256-GCM encrypted, keyed from a 24-word BIP-39 seed phrase. The core app is free. Pro unlocks Claude and GPT-4 via user-supplied API keys that go phone-to-provider directly, bypassing Cossi's infrastructure entirely.
For publications that want to verify Cossi's privacy claims:
Request assets at press@cossiapp.com — we'll send a download link within 24 hours.
Builder of Cossi. Background in AI systems and mobile engineering. Built Cossi after getting frustrated with AI tools that require you to send your most sensitive professional context — calendar, email, relationships — to servers you don't control.
Available for press interviews and technical deep-dives. Contact: press@cossiapp.com