CortexOS

Your thoughts.
Never leave your phone.

AI-powered journaling with therapy-grade insights — all processed on-device. No cloud. No servers. No compromise. Your mind, your data, your control.

Coming Soon — Android & iOS

Privacy isn't a feature.
It's the architecture.

Other apps promise not to read your data. We built an app that can't.

🛡️

Zero-Knowledge Architecture

Your entries are encrypted before they're even saved. We don't have the keys. We can't read your journal. Not "won't" — literally cannot.

Like Signal, but for journaling

On-Device AI Processing

TensorFlow Lite models run entirely on your phone. Sentiment analysis, emotion detection, pattern recognition — all without ever pinging a server.

No OpenAI. No Cloud. No APIs.
🎯

Therapy-Grade Analysis

CBT, DBT, ACT frameworks built into the AI. Detect cognitive distortions. Track emotional patterns. Get real insights, not generic prompts.

Clinical frameworks, consumer app

Whisper Voice Transcription

Speak your thoughts. OpenAI's Whisper runs locally — 99 languages, on-device. Your voice never leaves your phone.

On-device transcription
🔐

AES-256-GCM Encryption

Military-grade encryption with keys stored in your device's hardware security module. Steal the phone? Still can't read the entries.

Hardware-backed keystore

100% Offline Capable

No internet? No problem. Every feature works offline. Your journal doesn't depend on our servers — because there are none.

Zero server dependency

Not another journaling app.

A new category.

Feature
CortexOS
Others
AI-Powered Analysis
Cloud-based
On-Device Processing
Zero-Knowledge Privacy
Works Offline
Limited
Therapy-Grade Frameworks
Voice Transcription (Local)
They Can't Read Your Data

Everything you need.
Nothing you don't trust.

📊

Mood Tracking

Automatic sentiment analysis on every entry. Track patterns over days, weeks, months.

🎭

Emotion Detection

30+ emotions detected. Know exactly what you're feeling, not just "good" or "bad".

🧩

Pattern Recognition

AI spots recurring themes, triggers, and correlations you might miss.

💡

AI Insights

Personalized observations about your mental patterns and growth.

Smart Reminders

Write "remind me tomorrow" — AI detects it and schedules automatically.

🔔

Intelligent Nudges

Context-aware prompts based on your journaling patterns and emotional state.

📅

Throwbacks

Rediscover past entries. See how far you've come.

🎨

Beautiful Dark Mode

Premium design that's easy on the eyes, day or night.

"Most privacy policies are about what companies promise not to do. Ours is about what we can't do — because we built it that way."

0
Servers that see your data
256
Bit encryption standard
100%
On-device processing

Ready to own your thoughts?

Join the waitlist. Be the first to experience privacy-first AI journaling.

Coming Soon — Android & iOS