# OTA upgrade vs PDF Reader

The clearest difference is in-app purchases: OTA upgrade at none against PDF Reader's 6. OTA upgrade also leads on iOS requirement (12.1 vs 15.1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. PDF Reader sells 6 in-app purchases, starting at $2.99 per 7 days. OTA upgrade asks for nothing beyond the download.

OTA upgrade ships an update every 2 months, PDF Reader every 3 months. The most recent releases landed on October 10, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | OTA upgrade | PDF Reader |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Size | 39 MB | 36 MB |
| Requires iOS | **12.1** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [HUIZHOU REDBOX ELECTRONICS CO,.LTD](https://appshunter.io/developer/1693036399) | [KTC Technology](https://appshunter.io/developer/1888724049) |

## What reviewers say

### OTA upgrade

[App page](https://appshunter.io/ios/app/ota-upgrade/id6450377634)

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

**In-app purchases:** none


### PDF Reader

[App page](https://appshunter.io/ios/app/pdf-reader-text-to-speech/id6763692217)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Standard | $2.99 | per 7 days |
| Weekly Pro | $6.99 | per 7 days |
| Monthly Standard | $8.99 | per month |
| Monthly Pro | $19.99 | per month |
| Annual Standard | $71.99 | per year |
| Annual Pro | $159.99 | per year |


## Frequently asked questions

### Is OTA upgrade free?

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

### Is PDF Reader free?

PDF Reader is free to download, with in-app purchases available.

### Do OTA upgrade or PDF Reader have ads?

Neither OTA upgrade nor PDF Reader shows ads.

### Which is updated more often, OTA upgrade or PDF Reader?

OTA upgrade ships an update every 2 months, and PDF Reader every 3 months. Most recently, OTA upgrade was updated on October 10, 2026 and PDF Reader on October 25, 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.*