Tether - Sensitivity Tracker
Track Triggers & Symptoms
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Living with chronic sensitivities can feel overwhelming, but you do not have to navigate it alone.
Tether is a personal health companion designed for anyone dealing with environmental triggers, food sensitivities, nervous system overload, or complex chronic symptoms. Track your experiences, identify patterns, and receive personalized AI-powered insights, all in one place.
YOUR PERSONAL HEALTH JOURNAL
Log symptoms, foods, supplements, exposures, events, and recovery activities in seconds. Tether’s smart journal helps connect the dots between what you eat, what you encounter, and how you feel.
CORTEX, YOUR AI HEALTH COMPANION
Ask Cortex anything about your health journey. Powered by advanced AI and grounded in your personal data, Cortex offers thoughtful, informed guidance tailored to your specific triggers, safe items, and sensitivity profile. It is like having a wise friend who understands biology and takes your symptoms seriously.
FOOD SCANNER
Snap a photo of any food label or ingredient list. Tether analyzes it against your personal trigger and safe item lists, flagging potential concerns and suggesting alternatives.
HEALING PROTOCOL LIBRARY
Access a curated library of evidence-informed protocols across three tiers: Immediate Relief, Maintenance Routines, and Deep Repair Strategies. From breathwork to vagal toning to gut support, find guided tools that meet you where you are.
SENSITIVITY PROFILE
Build a living map of your body’s responses. Track triggers, safe items, and items you are testing. Watch your profile evolve as you learn what works for your unique biology.
SYSTEM CHECK
Take a guided assessment to explore which body systems may be contributing to your symptoms, including immune balance, nervous system regulation, histamine pathways, and gut health.
INSIGHTS AND PATTERNS
Tether analyzes your journal entries to surface patterns you might otherwise miss. See connections between your symptoms, triggers, exposures, and daily habits over time.
ALSO INCLUDED:
• Daily streak tracking to build consistent logging habits
• Supplement tracker
• Save and bookmark healing protocols
• Saved food scan results for quick reference
• Optional daily affirmations
• Dark mode
• Secure cloud backup when signed in
• Data export and full data control
Tether is not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare provider.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
This update improves Tether’s Cortex AI experience, adds clearer AI privacy controls, refines saved scans and sensitivity profile flows, and includes visual polish, stability improvements, and bug fixes across the app.
The developer, Zachary Lyons, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Health & Fitness
- User Content
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Zachary Lyons
- Size
- 40.6 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
16+
- 16+
- Frequent
Medical Treatment information
Contains
User-Generated Content
Health or Wellness Topics
- In-App Purchases
Yes
- Tether Premium $39.99
- Tether Premium $79.99
- Tether Premium $4.99
- Copyright
- © 2026 Zachary Lyons