# This & That — Correlations in Health data

> Health data correlation analysis for deeper understanding. (iPhone/iPad app by Matthew Bruce Greenfield.)

- Source: https://appshunter.io/ios/app/this-and-that/id1660363624 (this page in markdown: same URL + `.md`)
- Developer: [Matthew Bruce Greenfield](https://appshunter.io/developer/444610547)
- Category: Health & Fitness
- Price: Free with in-app purchases
- Rating: 3.60/5 from 9 App Store ratings · 4 written reviews indexed
- Age rating: 12+
- Requires: iOS 26.0 · 12 MB
- Languages: American English
- Released: 2023-01-30
- Data updated: 2026-08-26
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/this-and-that/id1660363624/reviews.md

## What is This & That?

This & That find correlations in your Health data to help you gain a deeper understanding. 

- Finds correlations between almost all Health app data types, including:
    - Exercise and activity
    - Dietary types (both macro and micro nutrients)
    - Body measurements and vital signs
    - Tracked symptoms
    - Reproductive health
    - Meditation and sleep stages
    - Environmental sound and headphone exposure
    - Daily weather (temperature, humidity, precipitation, etc)

- Calculates and displays statistically appropriate information such as correlation coefficients, confidence intervals, and p-values.

- Calculates cross correlations, lagged correlations for up to 60 days before and after, and also Granger causality.

- Provides correlation analyses in layman's terms to make the statistical data accessible and understandable.

Note: All app functionality requires an active free trial, active subscription, or Lifetime purchase.

## Key features

- Correlates diverse health data types
- Analyzes exercise, diet, vitals, and more
- Calculates correlation coefficients and p-values
- Performs cross and lagged correlations
- Explains statistical data in simple terms

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Monthly subscription | $1.99 | per month |
| Yearly subscription | $17.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime purchase | $69.99 | one-time |


## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/this-and-that/id1660363624/reviews.md

### 1/5 — This one’s actually pretty good

*2025-10-08*

Not gonna lie I like this one

**Developer response:** What a troll. Going to do this to all my apps now? Go on, small man, doing small man things.

### 5/5 — I really like it

*2024-06-11*

This app is what I’ve been looking for, a simple way to correlate different data sets from the Health app, I can’t believe no else has done it yet, and it is so nicely done here in this app, I use it and check it every day, thanks for making it.

### 5/5 — Great app!

*2023-11-15*

I’ve been using this app for the last 6 months. Amazing value!

### 1/5 — Forced subscription for data that’s already on-device!

*2023-02-02*

Wanted to try this out. The app absolutely stonewalls you at the subscription payment screen, forcing you to pick a subscription option before you get to experience ANY features. 

This app appears to do data analysis on the data saved locally, on your device, in the Health app. I fail to see the ongoing recurring costs in running an app that doesn’t even appear to need network access. This should have been a one-time payment, instead it feels like a money-grab. No thanks.

**Developer response:** There is a one time payment option. There's three options in the list - monthly, yearly, or a one time payment. 

And the free trial period is there to let you try it before you decide whether to continue with a subscription, so no, there is no "forced subscription". 

None of these details are hidden - it's all clearly stated in simple terms. Your angry rant is simply wrong.

The cost is the development of the app. Apps don't just materialise out of magical ether, fully formed, from wishful thinking. They are the result of hours, weeks, months, or years of development, all of which has to be paid for.

In the times before App Stores existed, ongoing development was supported by charging for updates. But when you download an app from the App Store you get updates for free forever. That is why apps have to use the subscription model these days - to ensure continued revenue to support ongoing development. That's the way the market has been structured, by Apple and others, for better or worse. You can't change that by shouting angrily in App Store reviews.

Anyway, considering your attitude, yes, it's best you delete my app and not try again. You are not welcome to try again. Goodbye.

## Frequently asked questions about This & That

### What health data can This & That analyze?

This & That can analyze a wide range of health data, including exercise and activity, dietary intake (macro and micro nutrients), body measurements, vital signs, tracked symptoms, reproductive health, meditation and sleep stages, environmental sound, headphone exposure, and daily weather conditions.

### How does This & That present statistical data?

This & That calculates and displays statistically appropriate information like correlation coefficients, confidence intervals, and p-values. It then provides these analyses in layman's terms to make the complex statistical data accessible and understandable for users.

### Does This & That offer a free trial?

Yes, all app functionality requires an active free trial, active subscription, or Lifetime purchase. Both the monthly and yearly subscription plans offer a 7-day free trial.

### What are the subscription options for This & That?

This & That offers a monthly subscription for $1.99 per month and a yearly subscription for $17.99 per year. Both plans include a 7-day free trial.

### What devices does This & That support?

This & That is supported on iPhone and iPad devices.

### How often is This & That updated?

The latest version of This & That is 2.0, and it was last updated on October 1, 2025. This indicates a recent update, suggesting ongoing development and support.

### What is the age rating for This & That?

This & That has an age rating of 12+, meaning it is suitable for users aged 12 and older.

### Does This & That have ads?

No, the application does not contain advertisements.

## Version history (last 5 releases)

### 2.1 — 2026-07-10

**Count missing days as zero**

For sometimes-activities like cycling, workouts, or medications, days with no data were previously left out of correlation calculations entirely. That biased results toward days when the activity happened. You can now choose, per data type, to count missing days as zero days instead. Only days where your other recorded data shows your devices were active get counted, so truly unknown days stay unknown. Expect much larger sample sizes, tighter confidence intervals, new causality results, and the disappearance of some "perfect" correlations that were never real.

Look for the new Missing days section on correlation views, or the toggle in each data type's filter settings.

**Also in this update**

Fixed help buttons in the filter view dismissing on first tap. The lag range menu now stays open while you toggle multiple ranges. Faster, more responsive setting toggles.

### 2.0 — 2025-10-01

# Correlations 2.0

## What's New

### Medications Support
With iOS 26 it's now possible to access medications data and build correlations with other data types. See correlations and causal relationships between medication doses and other health data types.

### New Liquid Glass Design
New Liquid Glass design for iOS 26

### Enhanced Correlation Analysis
New 'Causal only' filter and causal labels in correlation lists help you identify potential cause-and-effect relationships

### Additional Health Data Types
Added support for State of Mind and tooth brushing data

### 1.9.0 — 2024-06-05

- Added Workout data types, one per activity. For example "Walking Workouts", "Downhill Skiing Workouts", etc.

### 1.8.0 — 2024-03-03

- Optional Arc Timeline app location data import, for historical weather data

- Note: This update will do a full resync from Health app, to clean up some date+timezone storage mistakes in a previous update

### 1.7.0 — 2024-01-03

- Scatter plot points are now coloured by age

## Apps similar to This & That

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Health Hive: Fitness Age](https://appshunter.io/ios/app/health-hive-fitness-age/id1613535038) | 4.6 (932) | Free | Health & Fitness |
| [Vital Connect](https://appshunter.io/ios/app/vital-connect/id6444167196) | 1.4 (12) | Free | Health & Fitness |
| [Sonar - Health & Performance](https://appshunter.io/ios/app/sonar-health-and-performance/id1595073849) | 4.6 (335) | Free | Health & Fitness |
| [Ohms: Daily Mood & Wellness](https://appshunter.io/ios/app/ohms-daily-mood-and-wellness/id1607607304) | 4.9 (102) | Free | Health & Fitness |
| [HealthAnalysis](https://appshunter.io/ios/app/healthanalysis/id6443833210) | 1.0 (1) | Free | Health & Fitness |
| [Health App Data Export Tool](https://appshunter.io/ios/app/health-app-data-export-tool/id1625921705) | 3.6 (44) | Free | Health & Fitness |

## More apps by Matthew Bruce Greenfield

- [Arc Timeline - Trips & Places](https://appshunter.io/ios/app/arc-timeline-trips-and-places/id1063151918)
- [Arc Mini](https://appshunter.io/ios/app/arc-mini/id1510217238)
- [Life Balance](https://appshunter.io/ios/app/life-balance/id1607824907)
- [Arc Timeline Recorder](https://appshunter.io/ios/app/arc-timeline-recorder/id6499296846)
- [Arc Timeline 4](https://appshunter.io/ios/app/arc-timeline-4/id6740688708)

All apps by Matthew Bruce Greenfield: https://appshunter.io/developer/444610547

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*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 2026-08-26.*