# 億兆電卓 vs Missing Number Calculator

The clearest difference is price: 億兆電卓 at Free against Missing Number Calculator's $0.99. 億兆電卓 also leads on iOS requirement (15.6 vs 17.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

億兆電卓 is free to download; Missing Number Calculator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

億兆電卓 ships an update every 6 days, Missing Number Calculator every 3 days. The most recent releases landed on October 15, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | 億兆電卓 | Missing Number Calculator |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/id1443248865/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 days | **Every 3 days** |
| Size | 1 MB | 6 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [YouTeacher Inc.](https://appshunter.io/developer/423093933) | [Infinity Inc. (Apps)](https://appshunter.io/developer/1680741877) |

## What reviewers say

### 億兆電卓

[App page](https://appshunter.io/ios/app/id1443248865)

**Features:** macOS Compatibility

**In-app purchases:** none


### Missing Number Calculator

[App page](https://appshunter.io/ios/app/missing-number-calculator/id6747973776)

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

**In-app purchases:** none


## Frequently asked questions

### Is 億兆電卓 free?

億兆電卓 is free to download, with no in-app purchases.

### Is Missing Number Calculator free?

Missing Number Calculator costs $0.99, with no in-app purchases.

### Do 億兆電卓 or Missing Number Calculator have ads?

Neither 億兆電卓 nor Missing Number Calculator shows ads.

### Which is updated more often, 億兆電卓 or Missing Number Calculator?

億兆電卓 ships an update every 6 days, and Missing Number Calculator every 3 days. Most recently, 億兆電卓 was updated on October 15, 2026 and Missing Number Calculator on October 28, 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.*