# PDF Reader vs Calendar Pro

The clearest difference is in-app purchases: PDF Reader at none against Calendar Pro's 1. PDF Reader also leads on update cadence (daily vs every 2 months) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. Calendar Pro sells 1 one-off in-app purchase. PDF Reader asks for nothing beyond the download.

PDF Reader ships an update daily, Calendar Pro every 2 months. The most recent releases landed on September 14, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | PDF Reader | Calendar Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Daily** | Every 2 months |
| Size | 37 MB | 17 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 9+ |
| Developer | [Abdelaziz Boukhris](https://appshunter.io/developer/1875747023) | [xita apps](https://appshunter.io/developer/1461041968) |

## What reviewers say

### PDF Reader

[App page](https://appshunter.io/ios/app/pdf-reader-pdf-pro-editor/id6758962655)

**Features:** macOS Compatibility

**In-app purchases:** none


### Calendar Pro

[App page](https://appshunter.io/ios/app/calendar-pro-plan-and-remind/id6763255448)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calendar Pro | $5.99 | one-time |


## Frequently asked questions

### Is PDF Reader free?

PDF Reader is free to download, with no in-app purchases.

### Is Calendar Pro free?

Calendar Pro is free to download, with in-app purchases available.

### Do PDF Reader or Calendar Pro have ads?

Both PDF Reader and Calendar Pro show ads.

### Which is updated more often, PDF Reader or Calendar Pro?

PDF Reader ships an update daily, and Calendar Pro every 2 months. Most recently, PDF Reader was updated on September 14, 2026 and Calendar Pro on September 10, 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.*