The zero-knowledge AI journal with on-device AI that reads what you wrote and reflects on it, keeping your words on your phone.
Premium reader for EPUBs and PDFs with Focus Mode, real typography, and instant mode switching
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 tier with 3 personal books and unlimited classics. Velo Pro Annual: $69.99 USD per year. Velo Pro Monthly: $8.99 USD per month. Additional Enhanced Processing credits: 10 for $4.99 USD, 50 for $19.99 USD. 7-day free trial available.
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
Focus Mode displaying one word at a time at 50-1,000 WPM
Three reading modes with instant switching at same position
Intelligent PDF processing with chapter detection and OCR
Read-aloud with word-by-word tracking and voice picker
Cloud sync across iPhone, iPad and Mac
Velobrary with unlimited free public-domain classics
Catch Me Up on-device Apple Intelligence recap
Offline library with no internet required
Highlights in multiple colors, notes and dictionary lookup
Enhanced Processing for academic and scanned PDFs
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
Three intelligent reading modes with one synced position instead of switching contexts
Transforms difficult PDFs into readable books through automatic structure detection and OCR
Real typography and faithful rendering preserving code blocks and diagrams in technical content
Complete privacy with books stored on-device and optional encrypted cloud sync
Fully offline reading with no account required for the free tier
CortexOS
Velo