# Master Solutions vs PreOpApp Kids

The clearest difference is in-app purchases: Master Solutions at none against PreOpApp Kids's 3. Master Solutions also leads on update cadence (every 3 days vs every 11 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. PreOpApp Kids sells 3 one-off in-app purchases. Master Solutions asks for nothing beyond the download.

Master Solutions ships an update every 3 days, PreOpApp Kids every 11 days. Both last shipped on October 30, 2026.

## The numbers

| Metric | Master Solutions | PreOpApp Kids |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (17 ratings)](https://appshunter.io/ios/app/preopapp-kids/id6752910839/reviews)** |
| Number of ratings | — | **17** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 11 days |
| Monetization | — | Free |
| Size | 75 MB | 1.0 GB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [EMCAN-TEC](https://appshunter.io/developer/1649090170) | [LN Welsh MD Anesthesiologist, LLC](https://appshunter.io/developer/1841684340) |

## What reviewers say

### Master Solutions

[App page](https://appshunter.io/ios/app/master-solutions/id6739285708)

**Features:** macOS Compatibility

**In-app purchases:** none


### PreOpApp Kids

[App page](https://appshunter.io/ios/app/preopapp-kids/id6752910839)

This app uses interactive games and friendly characters to help children and their families feel less anxious about upcoming surgery. It provides visual preparation, smart guidance, and resources for parents, aiming to build confidence and reduce stress.

**Highlights:** Interactive games for hospital familiarization, Friendly characters for reassurance, Kid-friendly visual preparation stories, Smart reminders for surgical preparation, Parent resources and guidance, Physiology-responsive calming experiences, Motivational challenges for anesthesia induction

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Little Hottie | $2.99 | one-time |
| Mandalasync Game | $2.99 | one-time |
| Dream Fetcher Book | $9.99 | one-time |


## Frequently asked questions

### Is Master Solutions free?

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

### Is PreOpApp Kids free?

PreOpApp Kids is free to download, with in-app purchases available.

### Do Master Solutions or PreOpApp Kids have ads?

Neither Master Solutions nor PreOpApp Kids shows ads.

### Which is updated more often, Master Solutions or PreOpApp Kids?

Master Solutions ships an update every 3 days, and PreOpApp Kids every 11 days. Most recently, Master Solutions was updated on October 30, 2026 and PreOpApp Kids on October 30, 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.*