# Correlation Lab vs Stepwise

The clearest difference is in-app purchases: Stepwise at none against Correlation Lab's 3. Stepwise also leads on update cadence (every 3 days vs every 2 weeks). Correlation Lab's advantage is iOS requirement (15.1 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Correlation Lab sells 3 in-app purchases, starting at $1.99 per 7 days. Stepwise asks for nothing beyond the download.

Correlation Lab ships an update every 2 weeks, Stepwise every 3 days. The most recent releases landed on October 25, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Correlation Lab | Stepwise |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Size | 53 MB | 50 MB |
| Requires iOS | **15.1** | 26.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Radoslaw Jozefowicz](https://appshunter.io/developer/1859278240) | [璇 冯](https://appshunter.io/developer/1858747919) |

## What reviewers say

### Correlation Lab

[App page](https://appshunter.io/ios/app/correlation-lab-health-test/id6777799025)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly pro | $1.99 | per 7 days |
| Monthly pro | $3.99 | per month |
| Lifetime Pro | $4.99 | one-time |


### Stepwise

[App page](https://appshunter.io/ios/app/stepwise-step-and-walk-tracker/id6802314877)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Correlation Lab free?

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

### Is Stepwise free?

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

### Do Correlation Lab or Stepwise have ads?

Neither Correlation Lab nor Stepwise shows ads.

### Which is updated more often, Correlation Lab or Stepwise?

Correlation Lab ships an update every 2 weeks, and Stepwise every 3 days. Most recently, Correlation Lab was updated on October 25, 2026 and Stepwise on October 15, 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.*