# Master Pay vs QI Calculator

The clearest difference is in-app purchases: Master Pay at none against QI Calculator's 2. Master Pay also leads on iOS requirement (11.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. QI Calculator sells 2 one-off in-app purchases. Master Pay asks for nothing beyond the download.

Master Pay ships an update fortnightly, QI Calculator every 3 weeks. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Master Pay | QI Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Size | 68 MB | 129 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Parque Tecnologico](https://appshunter.io/developer/1189620948) | [shouhui qi](https://appshunter.io/developer/1185710456) |

## What reviewers say

### Master Pay

[App page](https://appshunter.io/ios/app/master-pay/id1505875313)

**Features:** macOS Compatibility

**In-app purchases:** none


### QI Calculator

[App page](https://appshunter.io/ios/app/qi-calculator/id6476379861)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Theme | $0.99 | one-time |
| Theme Blue Sky | $0.99 | one-time |


## Frequently asked questions

### Is Master Pay free?

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

### Is QI Calculator free?

QI Calculator is free to download, with in-app purchases available.

### Do Master Pay or QI Calculator have ads?

Neither Master Pay nor QI Calculator shows ads.

### Which is updated more often, Master Pay or QI Calculator?

Master Pay ships an update fortnightly, and QI Calculator every 3 weeks. Most recently, Master Pay was updated on November 3, 2026 and QI Calculator on November 8, 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.*