# Bio3G Clock vs Ratio Calculator Pro

The clearest difference is update cadence: Bio3G Clock at monthly against Ratio Calculator Pro's every 19 months. Bio3G Clock also leads on iOS requirement (13.0 vs 15). 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.

Bio3G Clock ships an update monthly, Ratio Calculator Pro every 19 months. Both last shipped on October 25, 2026.

## The numbers

| Metric | Bio3G Clock | Ratio Calculator Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 19 months |
| Size | 85 MB | 7 MB |
| Requires iOS | **13.0** | 15 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Biometrics 3g (PTY) LTD](https://appshunter.io/developer/1843550149) | [Krzysztof Gwiazda](https://appshunter.io/developer/1546740383) |

## What reviewers say

### Bio3G Clock

[App page](https://appshunter.io/ios/app/bio3g-clock/id6447108239)

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

**In-app purchases:** none


### Ratio Calculator Pro

[App page](https://appshunter.io/ios/app/ratio-calculator-pro/id6463126280)

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

**In-app purchases:** none


## Frequently asked questions

### Is Bio3G Clock free?

Bio3G Clock is free to download, with no in-app purchases.

### Is Ratio Calculator Pro free?

Ratio Calculator Pro is free to download, with no in-app purchases.

### Do Bio3G Clock or Ratio Calculator Pro have ads?

Neither Bio3G Clock nor Ratio Calculator Pro shows ads.

### Which is updated more often, Bio3G Clock or Ratio Calculator Pro?

Bio3G Clock ships an update monthly, and Ratio Calculator Pro every 19 months. Most recently, Bio3G Clock was updated on October 25, 2026 and Ratio Calculator Pro on October 25, 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.*