Comparison

CalmaApp vs Substrata

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

CalmaApp

Features
Read full description

You're not alone, over 1 billion people worldwide know exactly what you're going through including myself. The problem? Without tracking your migraines, it's nearly impossible to find your triggers. Studies show we misremember migraine frequency by up to 50% when relying on memory alone. And here's the tough truth: 68% of migraine patients never get a proper diagnosis because doctors can only guess without data. That's where CalmaAI comes in. We make migraine tracking simple, so you can finally understand what's causing your pain and take control of your life. Key Features: - Quick & Easy Tracking - Log attacks in seconds with our simple, intuitive interface - Pattern Discovery - Our AI analyzes your data to uncover hidden triggers you'd never spot on your own - whether it's sleep, weather, diet, or unexpected combinations - Visual Insights - Beautiful charts and reports that make sense of your migraine patterns at a glance - Doctor-Ready Reports - Generate comprehensive PDF reports to share with your healthcare provider during those short 15-minute appointments - AI Chat Assistant - Ask questions about your migraines and get personalized insights based on your tracking data Why I made CalmaAI? Finding migraine triggers is hard. Your memory fails you. Patterns aren't obvious. Doctor visits are too short to capture months of data. CalmaAI solves all of this by helping you build a complete picture of your migraines over time. Privacy Url : https://calmaai.flammelabs.com/privacy Terms Url : https://calmaai.flammelabs.com/terms

About

Substrata

This app analyzes environmental factors like weather and noise alongside your personal health data, such as sleep and heart rate, to identify potential triggers for headaches and other symptoms. It uses on-device intelligence to provide plain-English explanations and predictive alerts, helping you understand what affects your well-being.

Highlights
  • 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
Features
Read full description

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. The analysis 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 - Weather comes from Apple WeatherKit, using your approximate location - 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 26.2 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://kynossstudios.com/substrata-privacy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

CalmaApp4 screens
Substrata4 screens

Verdict

The call

The clearest difference is update cadence: Substrata at every 4 days against CalmaApp's every 2 months. CalmaApp's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 26.2). On price, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. CalmaApp sells 2 in-app purchases, starting at $9.99 per month and Substrata sells 4 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

CalmaApp ships an update every 2 months, Substrata every 4 days. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

Scorecard3 real differences · 6 level
CalmaApp versus Substrata: the parameters behind the verdict, then further details
ParameterCalmaAppSubstrata
PriceFreeFree
Rating—5.0 (4 ratings) — better
Number of ratings—4 — better
Update frequencyEvery 2 monthsEvery 4 days — better
AdsNoNo
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.1 — better26.2
Further details — not scored
Size85 MB7 MB
Age rating4+4+
DeveloperMohammed Akhlas HussainSteven Knauss

In-app purchases

2 purchases

CalmaApp

Subscriptions2
  • Calma Pro Monthly$9.991 Month
  • Calma Pro Annual$99.991 Year
4 purchases

Substrata

Subscriptions2
  • Substrata Premium Monthly7 Days trial$4.991 Month
  • Substrata Premium Annual7 Days trial$29.991 Year
One-time2
  • Substrata Premium$3.99
  • Substrata Premium Lifetime$89.99

Questions

Is CalmaApp free?
CalmaApp is free to download, with in-app purchases available.
Is Substrata free?
Substrata is free to download, with in-app purchases available.
Do CalmaApp or Substrata have ads?
Neither CalmaApp nor Substrata shows ads.
Which is updated more often, CalmaApp or Substrata?
CalmaApp ships an update every 2 months, and Substrata every 4 days. Most recently, CalmaApp was updated on October 28, 2026 and Substrata on October 25, 2026.

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