Intelligence, deeply explained
Not features.
A second mind.
Every capability in Mystacy exists for one reason: to free your mind from operational overhead so it can do what it does best. Here's how she actually works.
01
Core Intelligence
Stacy — your named AI
Stacy is not a chatbot. She is a persistent, named AI assistant with memory, personality, and a growing model of who you are. Every conversation deepens her understanding. She doesn't reset. She doesn't forget. She gets better.
Persistent memory across every session — she knows your history
Loaded with your context: tasks, contacts, projects, and preferences
Responds in under 2 seconds — faster than opening an app
Available via app, web, and SMS — wherever you are
Personality that adapts to your communication style over time
Stacy · AI Assistant
Active
YOU · 9:04am
What's on my plate today that I keep putting off?
STACY · 9:04am
Three things you've deferred more than twice: the Drip Society lease renewal (due Friday), the follow-up with Dr. Chen from last Tuesday, and the quarterly review deck. Based on your calendar, your best window is 2–4pm today. Want me to block it?
Context loaded
Full memory active
02
Relationship Layer
Contact Intelligence.
She knows everyone.
Every email, message, and interaction you have gets passively processed into rich relationship profiles. No CRM setup. No manual tagging. Stacy builds a picture of every person in your world — what they care about, what you've discussed, and what needs follow-up.
Passively reads inbound communications — no manual input required
Zettelkasten-style knowledge graph of every contact
Confidence scoring on facts — she knows what she knows
Surfaces relationship context before important meetings
Flags follow-ups you've missed without being asked
Contact Intelligence
Passive
Dr. Sarah Chen
Cardiologist · Memorial Hospital
Met at DoctoPreneur conference, March 2026. Interested in IV wellness
Last contact: Tuesday 11am email — unreplied
She mentioned opening a second practice in Boca Raton
Has referred 2 patients to Drip Society this year
Follow-up overdue
4 days · High priority
Relationship strength
Strong · 94% confidence
03
Mobile Intelligence
Stacy via SMS.
No app required.
Your second brain travels with you. Text Stacy from any phone — she responds, captures, organizes, and acts. Seeing a patient and have a thought? Text it. In a meeting and need to follow up on something? Text it. She handles it.
Single shared number — text from any device, any carrier
Full context from your account — she knows who you are
Captures tasks, ideas, and reminders via natural language
Responds to questions with full intelligence
MMS support — send images, voice notes, documents
SMS · Stacy Agent
Connected
remind me to follow up with dr chen tomorrow at 8am
Done. Reminder set for tomorrow 8am — follow up with Dr. Sarah Chen re: Boca Raton practice. I'll also surface her contact notes when it fires.
what did i capture this week?
14 captures this week: 6 tasks (3 done), 4 ideas (2 filed to Projects), 3 follow-ups (1 overdue — Dr. Chen), 1 expense note. Want a full summary?
04
Privacy Architecture
Encrypted
by design.
Your thoughts are the most sensitive data you have. Mystacy treats them accordingly. Client-side AES-256-GCM encryption means your data is encrypted in your browser before it ever leaves your device. The server — and the AI — only ever sees ciphertext.
Client-side AES-256-GCM — encrypted before it leaves your browser
Supabase stores only ciphertext — no plaintext in the database
AI context is decrypted browser-side before API calls
Zero knowledge architecture — we cannot read your data
HIPAA-considered design for medical professionals
Encryption Status
AES-256-GCM
Client-side encryption
● Active
Database storage
● Ciphertext only
AI context decryption
● Browser-side only
Data sold to third parties
✕ Never
Your key · Your data · Your mind
05 — vs. everything else
Why not just use
ChatGPT?
Because ChatGPT doesn't know you. It doesn't remember you. It doesn't work in the background. It doesn't know your contacts or your calendar. It's a brilliant tool. Stacy is a relationship.
Capability MYStacy ChatGPT / Claude Notion AI Task Apps
Persistent memory of you✓✕✕✕
Named, personal AI identity✓✕✕✕
Works via SMS✓✕✕✕
Passive contact intelligence✓✕✕✕
Client-side encryption✓✕✕✕
Task + project management✓✕✓✓
AI gets smarter about you over time✓✕✕✕
Invite-only access✓✕✕✕
Ready for a second brain?
Join the waitlist. We'll reach out personally when your spot is ready.
Invite-only · No card required · Respond within 5–7 days