# CalmaApp vs Substrata

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.

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.

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.

## The numbers

| Metric | CalmaApp | Substrata |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/substrata-headache-tracker/id6759664433/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | — | Freemium |
| Size | 85 MB | 7 MB |
| Requires iOS | **15.1** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Mohammed Akhlas Hussain](https://appshunter.io/developer/1830814080) | [Steven Knauss](https://appshunter.io/developer/1877190883) |

## What reviewers say

### CalmaApp

[App page](https://appshunter.io/ios/app/calmaapp-migraine-tracker/id6759279925)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calma Pro Monthly | $9.99 | per month |
| Calma Pro Annual | $99.99 | per year |


### Substrata

[App page](https://appshunter.io/ios/app/substrata-headache-tracker/id6759664433)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Substrata Premium Monthly | $4.99 | per month |
| Substrata Premium Annual | $29.99 | per year |
| Substrata Premium | $3.99 | one-time |
| Substrata Premium Lifetime | $89.99 | one-time |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*