# Query Health vs Substrata

The clearest difference is in-app purchases: Query Health at none against Substrata's 4. Query Health also leads on iOS requirement (15.1 vs 26.2). Substrata's advantage is update cadence (every 4 days vs monthly). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Substrata sells 4 in-app purchases, starting at $4.99 per month. Query Health asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Query Health against 5.0 for Substrata. Both are backed by a comparable volume of ratings — 2 and 4 respectively.

Query Health ships an update monthly, Substrata every 4 days. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Query Health | Substrata |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/query-health/id6746546924/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/substrata-headache-tracker/id6759664433/reviews) |
| Number of ratings | 2 | **4** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Monetization | **Free** | Freemium |
| Size | 55 MB | 7 MB |
| Requires iOS | **15.1** | 26.2 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Query Health](https://appshunter.io/developer/1803362638) | [Steven Knauss](https://appshunter.io/developer/1877190883) |

## What reviewers say

### Query Health

[App page](https://appshunter.io/ios/app/query-health/id6746546924)

This healthcare app simplifies medical appointment scheduling with an intelligent agent. It guides users through symptom and history questions to prepare comprehensive information for providers, enhancing appointment efficiency and patient care.

**Highlights:** Smart appointment scheduling, Guided symptom assessment, Secure provider integration, Personal health dashboard, Encrypted communication

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Query Health free?

Query Health is free to download, with no in-app purchases.

### Is Substrata free?

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

### Which has better reviews, Query Health or Substrata?

Query Health and Substrata are both rated 5.0 out of 5 on the App Store, from 2 and 4 ratings respectively.

### Do Query Health or Substrata have ads?

Neither Query Health nor Substrata shows ads.

### Which is updated more often, Query Health or Substrata?

Query Health ships an update monthly, and Substrata every 4 days. Most recently, Query Health was updated on October 30, 2026 and Substrata on November 5, 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.*