# Nitro PDF Pro vs PileStack

The clearest difference is review sentiment: PileStack at 100% against Nitro PDF Pro's 12%. PileStack also leads on rating (5.0 vs 3.9) and update cadence (every 4 days vs every 2 months). Nitro PDF Pro's advantage is ratings volume (161 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Nitro PDF Pro sells 2 in-app purchases, starting at $19.99 per year and PileStack sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

PileStack holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Nitro PDF Pro has 161 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 12% of Nitro PDF Pro's written reviews are positive against 100% of PileStack's.

Nitro PDF Pro ships an update every 2 months, PileStack every 4 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Nitro PDF Pro | PileStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (161 ratings)](https://appshunter.io/ios/app/nitro-pdf-pro-read-and-edit/id1608616539/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pilestack-link-saver/id6767052477/reviews)** |
| Number of ratings | **161** | 2 |
| Positive reviews | 12.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 63 MB | 14 MB |
| Requires iOS | 26.0 | **17.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nitro Software, Inc.](https://appshunter.io/developer/1607870122) | [Temuri Chitashvili](https://appshunter.io/developer/1895283893) |

## 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


### PileStack

[App page](https://appshunter.io/ios/app/pilestack-link-saver/id6767052477)

Save articles, videos, recipes, and links from anywhere into a unified library. Organize your saved content with custom collections and easily find what you need. Get reminders for old saves to make your content useful.

**Highlights:** Save articles, videos, and links, Customizable collections, Drag-and-drop reordering, Search saved content, Mark items as read, Reminders for old saves, Syncs via iCloud

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PileStack Pro Weekly | $1.99 | per 7 days |
| PileStack Pro Monthly | $2.99 | per month |
| PileStack Pro Yearly | $17.99 | per year |


## Frequently asked questions

### Is Nitro PDF Pro free?

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

### Is PileStack free?

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

### Which has better reviews, Nitro PDF Pro or PileStack?

PileStack is rated higher. Nitro PDF Pro averages 3.9 out of 5 from 161 ratings, while PileStack averages 5.0 from 2 ratings.

### Do Nitro PDF Pro or PileStack have ads?

Neither Nitro PDF Pro nor PileStack shows ads.

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

Nitro PDF Pro ships an update every 2 months, and PileStack every 4 days. Most recently, Nitro PDF Pro was updated on November 3, 2026 and PileStack on November 5, 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.*