CortexOS

CortexOS

Defining Zero-Knowledge AI Journaling
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About

CortexOS is a private, AI-powered journaling app where everything - voice transcription, emotion analysis, and AI conversations - runs entirely on your device. No cloud. No accounts. No one can read your entries — not even us. We built CortexOS because we believe the most honest version of yourself shouldn't live on someone else's server. Your journal is encrypted with a recovery phrase only you hold, analyzed by AI models that never leave your phone, and backed up through zero-knowledge encryption. Built by an indie developer. No VC. No data monetization. Just a tool that respects your mind.

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CortexOS - Zero-Knowledge AI Journalp/cortexos-zero-knowledge-ai-journalCortexOS•

13d ago

CortexOS v1.2 — The Psyche Layer: Your Journal Now Understands Who's Writing It

Ten days ago we launched CortexOS as the first Zero-Knowledge AI Journal. A full LLM on your phone. Every entry encrypted with keys only you hold. Nobody can read your data. Including us.

That was the foundation. Here's what we've shipped since.

Deep Analysis (v1.1.0) Every entry now gets a real interpretation from the on-device LLM. Not a sentiment label. The AI reads what you wrote and reflects back what's underneath. Emotions you didn't name. Patterns forming. Connections to entries from days or weeks ago. Runs silently after save.

The Psyche Layer - Adaptive Intelligence (v1.2.0) Before this, CortexOS understood each entry on its own. Now it connects the dots across your full history.

CortexOS•

23d ago

CortexOS - Zero-Knowledge AI Journal - Your mind, encrypted. AI that never leaves your phone.

Every AI journal sends your thoughts to a server. CortexOS doesn't. A full LLM (Llama 3.2) runs entirely on your phone. Voice transcription, 20+ emotions, 15 distortions, AI reflections, emotional chapters, yearly review. All on-device. All encrypted. Offline or online. Your entries are locked behind a 6-word phrase and PIN only you know. We can't read your data. Nobody can. That's not a setting. That's the architecture. New category: Zero-Knowledge AI Journal. Solo-built. 14-day free trial.
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