CortexOS
Zero-Knowledge AI Journal
Only for iPhone
Free · In-App Purchases
iPhone
100% Private AI journal that tracks your emotional patterns, detects shifts in how you think and feel, and helps you understand yourself - all on-device, fully encrypted.
CortexOS is a zero-knowledge AI journal. Your entries are encrypted on your device before they're stored. No one, not even us, can read your words. The AI runs locally too. Your journal is yours alone.
WRITE FREELY
Text or voice; journal however feels natural. CortexOS transcribes voice entries on-device using WhisperKit, so your spoken thoughts never leave your phone.
UNDERSTAND YOUR EMOTIONS
CortexOS detects over 20 emotions in your writing; from joy and gratitude to frustration and anxiety. Over time, you'll see patterns you never noticed: what lifts you up, what weighs you down, and what triggers shifts in how you feel.
AI REFLECTIONS
Have a private conversation with an AI that knows your journaling history. Ask it to help you reflect on recurring themes, unresolved feelings, or simply what's been on your mind lately. All processing stays on your device.
INSIGHTS DASHBOARD
Track mood trends, emotional patterns, and cognitive habits over days, weeks, and months. See how your emotional landscape evolves and spot the connections between life events and how you feel.
CHAPTERS
Your journaling journey is organized into 7-day chapters; each with a title, theme, and summary generated from your entries. Look back and see the story of your life unfolding.
THERAPIST REPORTS
Generate a PDF summary of your emotional patterns, themes, and cognitive habits to share with your therapist. No journal content is ever included - only the patterns.
ZERO-KNOWLEDGE ARCHITECTURE
- AES-256-GCM encryption for every entry
- Zero-knowledge cloud backup (server never sees your data)
- On-device AI. Your words never leave your phone
- Recovery phrase authentication (no email, no password)
- Face ID / Touch ID unlock
- No tracking, no ads, ever
CortexOS is for anyone who wants to journal with intention, and keep their inner world private.
SUBSCRIPTION OPTIONS
- Cortex Deep Monthly: $9.99/month
- Cortex Deep Yearly: $79.99/year (save 33%)
- Cortex Ultra Lifetime: $199.99 one-time purchase
Monthly and yearly plans include a 14-day free trial. Subscriptions auto-renew unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in Settings → Apple ID → Subscriptions.
Privacy Policy: https://cortexos.app/privacy
Terms of Use: https://cortexos.app/terms
Ratings & Reviews
Entry Echoes
- When a new entry echoes something you wrote 30+ days ago, CortexOS surfaces the connection and shows how your perspective has shifted. All on-device.
Smarter Blank Page
- Contextual prompts adapt to time of day, recent mood, and journaling gaps. They fade as you build the habit.
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.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Size
- 27.1 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later.
- Languages
- English
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Lifetime Access 229,99 €
- Premium Yearly 89,99 €
- Premium Monthly 9,99 €
- Provider
Orlin Ralinov Martinov
- Orlin Ralinov Martinov has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
- Address
46, ST MARY CRT BLK D FLT 4
TRIQ IL-PROF. NERIK VASSALLO
IS-SIGGIEWI
SGW3402
Malta - Phone Number
+356 99315128 - Email
info@cortexos.app
- Copyright
- © 2026 Orlin Martinov