The zero-knowledge AI journal with on-device AI that reads what you wrote and reflects on it, keeping your words on your phone.
Private, on-device template manager for virtual assistants, support agents, and solo professionals
Stage
Startup
Startup
Founded
Not given
Not given
Based in
MT
Not given
Pricing model
Freemium
Freemium
Pricing
Free: 10 encrypted entries per month. Premium Monthly: $7.99/month. Premium Annual: $49.99/year. Lifetime: $99.99 one-time purchase. All paid plans include a 7-day free trial.
Free: $0 forever. Pro Solo (Monthly): $3.50/month. Pro Solo (Annual): $29.99/year (billed yearly, save 29%). Team Fleet: $199/year for 5 seats ($16.58/month, add +5 or +10 seat packs).
Key features
On-device Llama 3.2 language model with no cloud calls
20+ emotion detection with intensity scoring
Deep Analysis: multi-paragraph AI reflections connecting to past entries
Cognitive distortion alerts based on CBT principles
On-device voice transcription with OpenAI Whisper
Zero-knowledge cloud vault with AES-256-GCM encryption
Memory layer that learns your patterns over time on-device
Behavioral pattern detection and cognitive pattern naming
7-day chapters that automatically organize journaling into narrative arcs
Therapist PDF reports for sharing with mental health professionals
Auto-fill templates by pasting customer data, emails, or CRM records
Reusable template libraries organized by client or workflow
Dynamic variables for dates, times, dropdowns, and formatted text
Text parser to extract fields from pasted labels
Spreadsheet extractor to map Excel or Google Sheets rows into templates
Works offline with optional cloud sync and end-to-end encryption
Version history with 200-step undo (Free has 10-step undo)
API access for filling templates from scripts
What makes it different
Only journaling app combining zero-knowledge encryption with on-device AI analysis
Open-source cryptographic core published under MIT license on GitHub
AI runs entirely on-device with zero network calls for data processing
Recovery phrase creates permanent data deletion if lost, proving zero-knowledge works
All processing happens on your device—templates never uploaded to servers on Free plan, with no AI training or analytics tracking
Works completely offline after the first load and syncs across devices with optional end-to-end encryption
Ready-made template libraries for support, sales, healthcare, IT and other industries available in the Store
Text and spreadsheet extractors eliminate retyping by parsing pasted data directly into template fields
Free forever plan with no account, email, or card required
CortexOS