The zero-knowledge AI journal with on-device AI that reads what you wrote and reflects on it, keeping your words on your phone.
Type Less, Insert More
Stage
Startup
Not given
Founded
Not given
Not given
Based in
MT
US
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 plan available with daily voice limit. Premium plan available with purchasable credits for transcription and formatting. 30-day money-back guarantee.
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
Text expansion with snippet triggers
AI voice typing
Dynamic placeholders like {{name}} and {{date}}
Snippet variations for different contexts
Clipboard history management
Voice commands to insert snippets
Organized folders and categories
Cloud sync across devices
Works in any application
Team collaboration and snippet sharing
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
Only tool with clipboard history, snippet variations, AI voice assistant, and offline voice typing
Free plan with no credit card required
Works everywhere across Windows, Mac, Linux, Chrome, and Android
CortexOS
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