# Data Rhythm vs Quantify 4

The clearest difference is in-app purchases: Data Rhythm at none against Quantify 4's 1. Data Rhythm also leads on update cadence (every 3 weeks vs every 21 months). Quantify 4's advantage is ads (none vs shown) and device support (3 vs 1). On price and iOS requirement there is nothing between them.

Both are free to download. Quantify 4 sells 1 one-off in-app purchase. Data Rhythm asks for nothing beyond the download.

Data Rhythm ships an update every 3 weeks, Quantify 4 every 21 months. Both last shipped on October 27, 2026.

## The numbers

| Metric | Data Rhythm | Quantify 4 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 21 months |
| Size | 17 MB | 89 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Masaki Hayashi](https://appshunter.io/developer/1609931545) | [KENJI KANEMOTO](https://appshunter.io/developer/402720982) |

## What reviewers say

### Data Rhythm

[App page](https://appshunter.io/ios/app/data-rhythm/id1639696025)

**Features:** macOS Compatibility

**In-app purchases:** none


### Quantify 4

[App page](https://appshunter.io/ios/app/quantify-4/id6448651638)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.49 | one-time |


## Frequently asked questions

### Is Data Rhythm free?

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

### Is Quantify 4 free?

Quantify 4 is free to download, with in-app purchases available.

### Do Data Rhythm or Quantify 4 have ads?

Data Rhythm shows ads; Quantify 4 does not.

### Which is updated more often, Data Rhythm or Quantify 4?

Data Rhythm ships an update every 3 weeks, and Quantify 4 every 21 months. Most recently, Data Rhythm was updated on October 27, 2026 and Quantify 4 on October 27, 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.*