# Substrata vs Digestio

The clearest difference is device support: Digestio at 3 against Substrata's 1. Digestio also leads on iOS requirement (15.1 vs 26.2). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Substrata sells 4 in-app purchases, starting at $4.99 per month and Digestio sells 2 in-app purchases, starting at $12.90 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Substrata | Digestio |
| --- | --- | --- |
| 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 4 days | — |
| Monetization | Freemium | — |
| Size | 7 MB | 52 MB |
| Requires iOS | 26.2 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Steven Knauss](https://appshunter.io/developer/1877190883) | [FNS Coaching & Formation](https://appshunter.io/developer/6775256316) |

## What reviewers say

### 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 |


### Digestio

[App page](https://appshunter.io/ios/app/digestio/id6775256314)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Digestio Core (mensuel) | $12.90 | per month |
| Digestio Core (annuel) | $69.00 | per year |


## Frequently asked questions

### Is Substrata free?

Substrata is free to download, with in-app purchases available.

### Is Digestio free?

Digestio is free to download, with in-app purchases available.

### Do Substrata or Digestio have ads?

Neither Substrata nor Digestio shows ads.

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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.*