# Biorhythm Calculator Simple vs heart rate data read

The clearest difference is update cadence: heart rate data read at monthly against Biorhythm Calculator Simple's every 10 months. Biorhythm Calculator Simple's advantage is iOS requirement (13.0 vs 18.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Biorhythm Calculator Simple ships an update every 10 months, heart rate data read monthly. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Biorhythm Calculator Simple | heart rate data read |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 10 months | **Monthly** |
| Size | 17 MB | 5 MB |
| Requires iOS | **13.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Kouji Yamauchi](https://appshunter.io/developer/1519365107) | [YUTAKA IZUMIYAMA](https://appshunter.io/developer/1657248429) |

## What reviewers say

### Biorhythm Calculator Simple

[App page](https://appshunter.io/ios/app/biorhythm-calculator-simple/id1542322175)

**Features:** macOS Compatibility

**In-app purchases:** none


### heart rate data read

[App page](https://appshunter.io/ios/app/heart-rate-data-read/id6761823344)

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

**In-app purchases:** none


## Frequently asked questions

### Is Biorhythm Calculator Simple free?

Biorhythm Calculator Simple is free to download, with no in-app purchases.

### Is heart rate data read free?

heart rate data read is free to download, with no in-app purchases.

### Do Biorhythm Calculator Simple or heart rate data read have ads?

Both Biorhythm Calculator Simple and heart rate data read show ads.

### Which is updated more often, Biorhythm Calculator Simple or heart rate data read?

Biorhythm Calculator Simple ships an update every 10 months, and heart rate data read monthly. Most recently, Biorhythm Calculator Simple was updated on November 3, 2026 and heart rate data read on October 31, 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.*