Core User Flows
1. Quick Add (2-tap) Contact Log entry

• Entry point from a profile or chat: “Add to Log”
• Minimal fields: date (day-level) + exposure sites (throat/oral, rectal, penile/genital, other)
• Optional “More details”: protection used, notes, planned/confirmed status

2. Report STI and select notification window

• User selects STI type (e.g., gonorrhea, chlamydia, syphilis)
• App suggests a default notification window (e.g., 30–60 days) with user adjustment
• App filters relevant logged contacts automatically

3. Notify partners (anonymous option)

• Anonymous in-app notification to logged contacts (if still reachable in-app)
• Alternative: generate a copy/paste message for manual outreach
• Messages are neutral and non-identifying, recommending appropriate testing (including multi-site testing when relevant)

Privacy & Safety Requirements (non-negotiable)
• Opt-in by default; easy opt-out and “Delete all”
• No message content analysis (no NLP on chats)
• Local encrypted storage tied to the user account on device
• No precise location tracking; no third-party sharing
• Anti-abuse controls (notifications only to logged contacts; rate limits)

Expected Impact
• Faster partner notification and testing
• Reduced onward transmission risk
• Lower user burden and stigma through anonymous, standardized health messaging