EU AI Act compliant. Open the app, write what you can't say out loud. Full AI runs on your phone. Nothing ever leaves the device.
CortexOS is the journal that learns who you are.
Write or speak. CortexOS listens, understands your emotions, and gives you back something no other journal can. Everything runs on your device. No cloud. No data harvesting. No one reading your words. Ever. EU AI Act compliant.
YOUR AI GETS SMARTER OVER TIME
Most journaling apps treat every entry like the first. CortexOS builds a private understanding of your patterns and growth. Every reflection gets more personal the longer you journal. We call it Adaptive Intelligence.
DEEP ANALYSIS ON EVERY ENTRY
After you write, an on-device LLM reads between the lines. It surfaces emotional patterns, cognitive habits, and growth you might not see yourself. Entries save instantly. The AI does its work quietly in the background.
BEHAVIORAL PATTERNS
CortexOS tracks the cognitive patterns and emotional rhythms in your writing over time. Things like rumination, self-compassion, stress responses, growth moments. Trend chips show you what's emerging, what's fading, what's stable. Nothing gets labeled or diagnosed. Just named, so you can notice them yourself.
SELF-AWARENESS CARD
What CortexOS has learned about you. Themes, tendencies, cognitive habits, growth moments. Built from your own words. Visible only to you.
AI REFLECTIONS
Talk through what's on your mind by text or voice. The AI remembers your themes, knows your patterns, and asks questions that help you go deeper. Without judgment, without your words ever leaving your phone.
VOICE JOURNALING
Speak instead of type. WhisperKit transcribes your voice entirely on-device. No internet needed.
INSIGHTS & PATTERNS
Track 20+ emotions over days, weeks, and months. See mood trends, spot triggers, and find the connections between life events and how you feel. CortexOS surfaces the patterns. You decide what to do with them.
CHAPTERS
Every week becomes a chapter in your story. Auto-titled, themed, and summarized by AI from your entries.
YEAR IN REVIEW
Once a year, CortexOS turns your entries into a full story of the year you lived. Your emotional arc month by month, your chapters, your themes, the growth you might not have noticed in the moment. Built from your own words, written on-device.
SMART NOTIFICATIONS
Your reflection prompts and reminders aren't generic. They pull from what you've actually been writing about and the patterns CortexOS has noticed. Nudges that feel like a quiet tap from someone who knows you.
ENTRY ECHOES & GHOST TEXT
Old entries bubble up to remind you what you've already told yourself. A gentle prompt fades in when the page sits empty. Small touches that make journaling a habit instead of a chore.
THERAPIST REPORTS
Generate a shareable PDF of your emotional patterns and cognitive trends. No journal content included. Just the insights your therapist actually needs.
PRIVATE BY DESIGN
- AES-256-GCM encryption on every entry
- Zero-knowledge cloud backup (we can't read your data)
- Your pattern history travels with you on device restores, still end-to-end encrypted
- On-device AI. Nothing sent to servers.
- No email, no password. Recovery phrase only.
- Face ID / Touch ID
- No tracking. No ads. No exceptions.
Built by a solo developer founder in Malta, Europe. No investors, no ads, no data deals. Just a journal that is yours alone. Enhanced by AI.
AI Disclosure: https://cortexos.app/ai-disclosure
Trust Center: https://cortexos.app/trust
Privacy Policy: https://cortexos.app/privacy
Terms of Use: https://cortexos.app/terms
Technical Whitepaper: https://cortexos.app/whitepaper
Your Mind, Encrypted.
I absolutely love this app. It lets me speak my thoughts out loud while it listens and neatly transcribes everything for me. It’s incredibly helpful for clearing my mind and staying organized day to day and it is super compatible with a busy lifestyle. The interface is modern, intuitive, and genuinely pleasant to use. Great job Cortex team!
Developer Response
Thank you. Voice capture was built exactly for this; thoughts caught while life keeps moving. Glad it’s landing. More to come. CortexOS Team
A Safe Space for My Thoughts
OliDeguara
I really enjoy this app, it feels like a personal space where I can share my thoughts, reflect on my day, and be completely honest with myself. I mostly use it to unwind and process everything after a long day and it truly helps me reset.
Developer Response
We are absolutely over the moon that CortexOS helps you unwind and reset! We strive to add more features and improve the overall experience at all times. Happy journaling! CortexOS Team
• AI badge on every AI-generated reflection, insight, and chapter name. You always know what came from you and what came from the AI.
• New "About AI in CortexOS" section in Settings → Support & Privacy.
• Onboarding now opens with a clear AI disclosure before any model spins up.
• Fixed: model download progress and reflection saving overlay are now readable in light mode.
• EU AI Act compliant, 88 days before the August 2 deadline. Receipts at https://cortexos.app/trust.
Version 1.3.4
The developer, Orlin Ralinov Martinov, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary based, for example, on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More