# PDF Viewer by Nutrient vs Ukonik

The clearest difference is rating: Ukonik at 5.0 against PDF Viewer by Nutrient's 4.6. Ukonik also leads on update cadence (every 10 days vs monthly). PDF Viewer by Nutrient's advantage is ratings volume (9.1K vs 1) and device support (4 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. PDF Viewer by Nutrient sells 2 in-app purchases, starting at $6.99 per 3 months and Ukonik sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Ukonik holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: PDF Viewer by Nutrient has 9.1K ratings behind it against 1, so its average is the more settled of the two.

PDF Viewer by Nutrient ships an update monthly, Ukonik every 10 days. The most recent releases landed on November 10, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | PDF Viewer by Nutrient | Ukonik |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (9.1K ratings)](https://appshunter.io/ios/app/pdf-viewer-by-nutrient/id1120099014/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ukonik/id6798482099/reviews)** |
| Number of ratings | **9.1K** | 1 |
| Positive reviews | 73.2% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 10 days** |
| Monetization | Freemium | Freemium |
| Size | 111 MB | 54 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | **iPhone, iPad, Mac, Vision Pro** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [PSPDFKit GmbH](https://appshunter.io/developer/966931428) | [Wellkirk](https://appshunter.io/developer/6798482101) |

## What reviewers say

### PDF Viewer by Nutrient

[App page](https://appshunter.io/ios/app/pdf-viewer-by-nutrient/id1120099014)

Easily view, search, and annotate PDF documents on your iPhone and iPad. Access files from cloud services, fill out forms, add signatures, and organize your documents. Advanced features are available through a subscription.

**Highlights:** View, search, and annotate PDFs, Cloud service integration, Fill out forms and add signatures, Create and edit PDF pages, Password protection, Night mode and text-to-speech

**Features:** Family Sharing, iMessage stickers, iPhone Duo support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Viewer Pro 3 Months | $6.99 | per 3 months |
| PDF Viewer Pro Yearly | $19.99 | per year |

**What reviewers like**

- 🚀 Seamless integration with iCloud and Files app
- 👍 Intuitive annotation tools with Apple Pencil
- 🎨 Versatile highlighting and drawing options
- 💾 Saves annotations to original PDF files
- 🔍 Powerful search and navigation features

**What reviewers complain about**

- 🐛 Occasional crashes and performance issues
- 🤔 Confusing UI and steep learning curve
- 🔀 Difficulty managing and organizing PDF files
- 🔍 Inconsistent text selection and highlighting
- 🔒 Privacy concerns around data collection

**Reported bugs**

- Annotations randomly disappearing or not saving
- Incompatibility issues with certain PDF files
- Scrolling and panning problems on large PDFs
- Unexpected crashes after iOS updates

**Requested features**

- Add a rubber/eraser tool for annotations
- Implement a side-by-side PDF view mode
- Improve palm rejection and gesture support
- Allow customization of toolbar and shortcuts
- Provide better options for PDF file management


### Ukonik

[App page](https://appshunter.io/ios/app/ukonik/id6798482099)

This app analyzes your calendar and body recovery data to provide a daily performance load score. It helps you understand when to push and when to rest, offering insights and tools to optimize your schedule and well-being.

**Highlights:** Daily performance load score, Calendar and body recovery integration, Push/recover recommendations, Focus time protection, Weekly AI insights, Calendar event analysis

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ukonik Pulse | $4.99 | per month |
| Ukonik Signal | $9.99 | per month |


## Frequently asked questions

### Is PDF Viewer by Nutrient free?

PDF Viewer by Nutrient is free to download, with in-app purchases available.

### Is Ukonik free?

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

### Which has better reviews, PDF Viewer by Nutrient or Ukonik?

Ukonik is rated higher. PDF Viewer by Nutrient averages 4.6 out of 5 from 9.1K ratings, while Ukonik averages 5.0 from 1 ratings.

### Do PDF Viewer by Nutrient or Ukonik have ads?

Neither PDF Viewer by Nutrient nor Ukonik shows ads.

### Which is updated more often, PDF Viewer by Nutrient or Ukonik?

PDF Viewer by Nutrient ships an update monthly, and Ukonik every 10 days. Most recently, PDF Viewer by Nutrient was updated on November 10, 2026 and Ukonik on November 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.*