# Missing Number Calculator vs Read Text & PDF

The clearest difference is price: Read Text & PDF at Free against Missing Number Calculator's $0.99. Read Text & PDF also leads on update cadence (every 2 days vs every 3 days). Missing Number Calculator's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement there is nothing between them.

Read Text & PDF 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.

Missing Number Calculator ships an update every 3 days, Read Text & PDF every 2 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Missing Number Calculator | Read Text & PDF |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 days | **Every 2 days** |
| Size | 6 MB | 6 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Infinity Inc. (Apps)](https://appshunter.io/developer/1680741877) | [Kaneko Kei](https://appshunter.io/developer/1884092621) |

## What reviewers say

### Missing Number Calculator

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

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

**In-app purchases:** none


### Read Text & PDF

[App page](https://appshunter.io/ios/app/read-text-and-pdf-voice-changer/id6809586569)

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

**In-app purchases:** none


## Frequently asked questions

### Is Missing Number Calculator free?

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

### Is Read Text & PDF free?

Read Text & PDF is free to download, with no in-app purchases.

### Do Missing Number Calculator or Read Text & PDF have ads?

Read Text & PDF shows ads; Missing Number Calculator does not.

### Which is updated more often, Missing Number Calculator or Read Text & PDF?

Missing Number Calculator ships an update every 3 days, and Read Text & PDF every 2 days. Most recently, Missing Number Calculator was updated on October 30, 2026 and Read Text & PDF on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*