# Substrata: Headache Tracker — Total Health Data Analysis > Health and environmental data correlation for headache and symptom trigger analysis. (iPhone/iPad app by Steven Knauss.) - Source: https://appshunter.io/ios/app/substrata-headache-tracker/id6759664433 (this page in markdown: same URL + `.md`) - Developer: [Steven Knauss](https://appshunter.io/developer/1877190883) - Category: Health & Fitness, Lifestyle - Price: Free with in-app purchases - Rating: 5.00/5 from 4 App Store ratings - Age rating: 4+ - Requires: iOS 26.2 · 5 MB - Languages: English, French, German, Italian, Japanese, Portuguese, Spanish - Released: 2026-03-16 - Data updated: 2026-07-09 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/substrata-headache-tracker/id6759664433/reviews.md ## What is Substrata? Wake up tired without knowing why? Headaches that hit out of nowhere? Substrata watches the noise, weather, and air around you, then pairs it with your sleep, heart rate, and HRV — so you can see exactly what's affecting how you feel. It runs entirely on your iPhone using Apple Intelligence. After about two weeks, the on-device correlation engine starts surfacing connections — barometric pressure drops that match your migraine days, bedroom noise that quietly steals your deep sleep, weather patterns that drag down your HRV. Plain-English explanations you could share with your doctor. YOUR SLEEP, EXPLAINED - Sleep Condition Score: how well your bedroom actually treated you (noise, temperature, humidity, pressure stability) - Pairs with HealthKit sleep data + Apple Watch wrist temperature - Hourly, daily, weekly charts with WHO/EPA threshold zones color-coded HEADACHE & SYMPTOM TRIGGERS - Tap to log a headache (migraine, tension, cluster) with severity and notes - After 20-30 logged events, your personal trigger profile starts building - Predictive alerts when conditions match your past headache patterns - Also tracks allergies, mood, joint pain, energy ON-DEVICE INTELLIGENCE - All correlation analysis runs on your iPhone - No servers. No accounts. No third-party analytics SDKs. - Microphone is not used in production; noise data comes from Apple Watch - Privacy nutrition label: no data collected WHAT YOU GET WITH PREMIUM - Every correlation the engine finds (free tier shows your top one) - Personal headache trigger profile + predictive alerts - AI-generated insight narratives - PDF and CSV export — bring a real report to your doctor - History beyond 30 days Requires iPhone with iOS 26 or later and an Apple Intelligence-capable device for AI insights. Apple Watch strongly recommended for environmental noise, HRV, and sleep-stage data; works without a Watch using weather, sleep duration, and headphone audio. Substrata is not a medical device and does not provide medical advice. It explores potential connections between environmental and health data for personal review. Consult a healthcare provider for diagnosis or treatment. Privacy Policy: https://sknauss7.github.io/KynossStudiosSupport/substrata-privacy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Key features - Sleep condition scoring - Headache and symptom logging - Personal trigger profile building - Predictive alert system - On-device AI correlation - HealthKit and Apple Watch integration - PDF and CSV export ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Substrata Premium Monthly | $4.99 | per month | | Substrata Premium Annual | $29.99 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Substrata Premium | $3.99 | one-time | | Substrata Premium Lifetime | $89.99 | one-time | ## Frequently asked questions about Substrata ### What is Substrata's Sleep Condition Score? Substrata's Sleep Condition Score evaluates how well your bedroom environment supported your sleep. It considers factors like noise levels, temperature, humidity, and barometric pressure stability, providing insights into your sleep quality. ### How does Substrata identify headache triggers? After logging 20-30 headache events, Substrata's on-device engine builds a personal trigger profile. It correlates your logged symptoms with environmental data like barometric pressure drops and bedroom noise, then offers predictive alerts. ### Does Substrata use my microphone to collect noise data? No, Substrata does not use your microphone in production. Noise data is sourced from your Apple Watch, ensuring your privacy is maintained. ### What are the benefits of Substrata Premium? Substrata Premium unlocks all identified correlations, your personal headache trigger profile with predictive alerts, AI-generated insight narratives, and the ability to export data in PDF and CSV formats for doctor consultations. It also provides history beyond 30 days. ### What devices is Substrata compatible with? Substrata requires an iPhone with iOS 26 or later and an Apple Intelligence-capable device for AI insights. An Apple Watch is strongly recommended for comprehensive data, but the app works without one using weather and sleep duration data. ### Is Substrata a medical device? No, Substrata is not a medical device and does not provide medical advice. It is designed to explore potential connections between environmental and health data for personal review. Always consult a healthcare provider for diagnosis or treatment. ### How often is Substrata updated? The latest version of Substrata is 1.6.2, last updated on May 25, 2026. The app is actively maintained, with updates typically released to improve features and address any issues. ### What is the pricing for Substrata Premium? Substrata offers two premium subscription plans: Monthly at $4.99 and Annual at $29.99. Both plans include a 7-day free trial period. ## Version history (last 5 releases) ### 1.6.2 — 2026-05-25 Substrata now leads with headaches. Tap to log one from the Dashboard, then watch the patterns build as Substrata pairs each entry with the weather, sleep, and noise around it. Plus a sharper paywall, an honest motion-permission description, and dozens of smaller fixes across the app. ### 1.6.1 — 2026-05-12 Listing copy and metadata refreshed so it's easier to find Substrata if you're tracking headaches, sleep, or weather-driven symptoms. Recompiled against the latest iOS SDK. No new permissions or features in this update. ### 1.1.4 — 2026-04-14 New welcome screen helps first-time users understand what Substrata does and how it works — right from the first launch. ### 1.1.3 — 2026-04-07 New welcome screen helps first-time users understand what Substrata does and how it works — right from the first launch. ### 1.1.2 — 2026-04-04 Bug fixes ## More apps by Steven Knauss - [Enveloop](https://appshunter.io/ios/app/enveloop/id6759178198) - [Primo - Gift & Event Planner](https://appshunter.io/ios/app/primo-gift-and-event-planner/id6759265509) - [Riffl - Word Puzzle](https://appshunter.io/ios/app/riffl-word-puzzle/id6759587346) - [HomeBaseAI - Home Manager](https://appshunter.io/ios/app/homebaseai-home-manager/id6759628026) - [Sievr - AI Photo Cleaner](https://appshunter.io/ios/app/sievr-ai-photo-cleaner/id6759723263) All apps by Steven Knauss: https://appshunter.io/developer/1877190883 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-09.*