The zero-knowledge AI journal with on-device AI that reads what you wrote and reflects on it, keeping your words on your phone.
Free email signature generator for Gmail, Outlook and Apple Mail
Stage
Startup
Not given
Founded
Not given
Not given
Based in
MT
CZ
Pricing model
Freemium
Not given
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: 3 designs, logo and colors from website, works in Gmail/Outlook/Apple Mail, includes small "Made with Signguin" link. Premium: $12 one-time payment (not a subscription) includes photo in signature, all designs, removes branding link, adds action buttons, banners and Save contact.
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
Automatically pulls logo and brand colors from your website
Multiple designs for different industries
Works with Gmail, Outlook, Apple Mail, and other email apps
Email-safe code that displays correctly in Outlook
Dark mode compatible
Mobile-optimized layouts
Action buttons and banners in Premium
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
Free with no sign-up required, works immediately without account creation
Automatically extracts branding from your website in seconds
CortexOS
Signguin