# Nitro PDF Pro vs Transpa Event

The clearest difference is in-app purchases: Transpa Event at none against Nitro PDF Pro's 2. Transpa Event also leads on update cadence (every 2 days vs every 2 months) and iOS requirement (15.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Nitro PDF Pro sells 2 in-app purchases, starting at $19.99 per year. Transpa Event asks for nothing beyond the download.

Nitro PDF Pro ships an update every 2 months, Transpa Event every 2 days. The most recent releases landed on October 30, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Nitro PDF Pro | Transpa Event |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (161 ratings)](https://appshunter.io/ios/app/nitro-pdf-pro-read-and-edit/id1608616539/reviews)** | — |
| Number of ratings | **161** | — |
| Positive reviews | 12.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 63 MB | 20 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nitro Software, Inc.](https://appshunter.io/developer/1607870122) | [HIGH VISION IN INFORMATION OF TECHNOLOGY NETWORKS](https://appshunter.io/developer/1842813363) |

## What reviewers say

### Nitro PDF Pro

[App page](https://appshunter.io/ios/app/nitro-pdf-pro-read-and-edit/id1608616539)

Edit, annotate, and secure PDF documents on the go. This app offers powerful tools for professionals to manage PDFs, including mobile scanning and AI-powered data extraction. Seamlessly integrate with cloud services and use styluses for precise markups.

**Highlights:** Edit and annotate PDFs with precision tools, Organize pages, merge, and extract PDFs, Mobile scanning with OCR for searchable PDFs, Secure documents with password protection, AI-powered data extraction from tables, Seamless integration with cloud storage

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Subscription | $19.99 | per year |
| Nitro PDF Pro for iOS | $9.99 | one-time |

**What reviewers like**

- 👍 Helpful for managing project documents
- 👍 Convenient for PDF modifications
- 👍 Superior PDF handling on Mac
- 👍 Satisfactory in both Mac and Windows environments

**What reviewers complain about**

- 👎 Pro features not available on iOS/iPadOS
- 👎 Yearly charges for basic features
- 👎 Expensive and useless
- 👎 Fails to deliver promised features
- 👎 Impossible to reorder PDF files

**Reported bugs**

- Cannot reorder PDF files
- Crashes when opening PDFs from websites/email
- Does not save markups or documents
- Difficulty creating new folders
- Cannot rotate pages

**Requested features**

- Keyboard support (Cmd + F for search)
- Ability to cancel search with Esc
- OCR and conversion to text documents on tablets
- User manual for iPad app
- Support for Apple Pencil


### Transpa Event

[App page](https://appshunter.io/ios/app/transpa-event/id6780291132)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Nitro PDF Pro free?

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

### Is Transpa Event free?

Transpa Event is free to download, with no in-app purchases.

### Do Nitro PDF Pro or Transpa Event have ads?

Neither Nitro PDF Pro nor Transpa Event shows ads.

### Which is updated more often, Nitro PDF Pro or Transpa Event?

Nitro PDF Pro ships an update every 2 months, and Transpa Event every 2 days. Most recently, Nitro PDF Pro was updated on October 30, 2026 and Transpa Event on October 6, 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.*