# Preg Wheel vs CritiCalc

The clearest difference is update cadence: CritiCalc at every 2 weeks against Preg Wheel's every 9 months. Preg Wheel's advantage is iOS requirement (10.0 vs 15.6). 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.

Preg Wheel ships an update every 9 months, CritiCalc every 2 weeks. The most recent releases landed on October 24, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Preg Wheel | CritiCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (62 ratings)](https://appshunter.io/ios/app/preg-wheel/id445303968/reviews)** | — |
| Number of ratings | **62** | — |
| Positive reviews | 58.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 24 MB | 53 MB |
| Requires iOS | **10.0** | 15.6 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 17+ | 17+ |
| Developer | [Andrew Yu](https://appshunter.io/developer/328693314) | [Jason Richmond](https://appshunter.io/developer/1659125082) |

## What reviewers say

### Preg Wheel

[App page](https://appshunter.io/ios/app/preg-wheel/id445303968)

This app provides a digital pregnancy wheel for iPhone users, eliminating the need for a physical one. It allows for quick input of key dates and offers accurate results, accounting for calendar variations. The app also saves your information for future use and includes important dates for screenings throughout the pregnancy.

**Highlights:** Input LMP, EDD, EGA, and IVF dates, Accurate date calculations with leap year support, Save and restore input dates, Track important screening test dates, View dates for 1st Trimester US, CVS, Quad Screen, and more

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Simple and easy to use
- 🚀 Fast calculations
- ✅ Accurate results
- 👍 Great for medical professionals
- 👍 Efficient paper wheel alternative

**What reviewers complain about**

- 🐛 Not updated for latest iOS
- 🐛 Functionality issues after updates
- 🐛 IVF dating function not working
- 🐛 Inconsistent calculations
- 🐛 App crashes/shuts down

**Reported bugs**

- IVF dating function does not work
- Cannot calculate due date based on weeks and ultrasound date
- LMP does not change when due date is entered, and vice versa
- App not compatible with iOS 14
- App not compatible with iOS 11

**Requested features**

- Update for latest iOS
- Update IVF dating function
- Add FTS window
- Ensure compatibility with newer devices/OS
- Local time zone support


### CritiCalc

[App page](https://appshunter.io/ios/app/criticalc/id1659125080)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Preg Wheel free?

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

### Is CritiCalc free?

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

### Do Preg Wheel or CritiCalc have ads?

Neither Preg Wheel nor CritiCalc shows ads.

### Which is updated more often, Preg Wheel or CritiCalc?

Preg Wheel ships an update every 9 months, and CritiCalc every 2 weeks. Most recently, Preg Wheel was updated on October 24, 2026 and CritiCalc on October 17, 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.*