# CORIOmaster vs Diaper Calc

The clearest difference is update cadence: CORIOmaster at every 11 months against Diaper Calc's every 39 months. CORIOmaster also leads on iOS requirement (11.0 vs 16.6). 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.

CORIOmaster ships an update every 11 months, Diaper Calc every 39 months. The most recent releases landed on October 29, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | CORIOmaster | Diaper Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (1 ratings)](https://appshunter.io/ios/app/diaper-calc/id1489084828/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 11 months** | Every 39 months |
| Monetization | — | Free |
| Size | 18 MB | 2 MB |
| Requires iOS | **11.0** | 16.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [tvone limited](https://appshunter.io/developer/1417101820) | [Pavel Zak](https://appshunter.io/developer/536894801) |

## What reviewers say

### CORIOmaster

[App page](https://appshunter.io/ios/app/coriomaster/id1417101851)

**Features:** macOS Compatibility

**In-app purchases:** none


### Diaper Calc

[App page](https://appshunter.io/ios/app/diaper-calc/id1489084828)

This utility helps parents estimate the number of diapers needed for their baby over a specific period. It considers the baby's current weight and projected growth to recommend optimal diaper pack sizes and offers helpful purchasing tips. The app supports multiple children and works offline.

**Highlights:** Computes diaper count and sizes for up to 3 years, Recommends ideal diaper packaging, Displays baby growth charts, Supports US and EU diaper size distinctions, Usable for multiple children, Offers diaper purchase tips, Works offline, Light/Dark mode support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CORIOmaster free?

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

### Is Diaper Calc free?

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

### Do CORIOmaster or Diaper Calc have ads?

Neither CORIOmaster nor Diaper Calc shows ads.

### Which is updated more often, CORIOmaster or Diaper Calc?

CORIOmaster ships an update every 11 months, and Diaper Calc every 39 months. Most recently, CORIOmaster was updated on October 29, 2026 and Diaper Calc on October 13, 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.*