# PDF Viewer by Nutrient vs Hi Assistant

The clearest difference is review sentiment: PDF Viewer by Nutrient at 73% against Hi Assistant's 30%. PDF Viewer by Nutrient also leads on rating (4.6 vs 3.3) and ads (none vs shown). Hi Assistant's advantage is update cadence (every 2 weeks vs monthly) and iOS requirement (15.1 vs 17.0). On price, in-app purchases, monetization model and device support 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 Hi Assistant sells 7 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

PDF Viewer by Nutrient holds the better App Store score, 4.6 against 3.3. That said, the two scores are not equally well evidenced: PDF Viewer by Nutrient has 9.1K ratings behind it against 27, so its average is the more settled of the two. Written reviews point the same way: 73% of PDF Viewer by Nutrient's written reviews are positive against 30% of Hi Assistant's.

PDF Viewer by Nutrient ships an update monthly, Hi Assistant every 2 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | PDF Viewer by Nutrient | Hi Assistant |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (9.1K ratings)](https://appshunter.io/ios/app/pdf-viewer-by-nutrient/id1120099014/reviews)** | [3.3 (27 ratings)](https://appshunter.io/ios/app/hi-assistant/id1665814139/reviews) |
| Number of ratings | **9.1K** | 27 |
| Positive reviews | **73.4% of reviews** | 30.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Freemium | Free with in-app purchases |
| Size | 109 MB | 33 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | **iPhone, iPad, Mac, Vision Pro** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [PSPDFKit GmbH](https://appshunter.io/developer/966931428) | [Hien Nguyen](https://appshunter.io/developer/1576243757) |

## 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. Import files from cloud services, fill out forms, add signatures, and organize your documents. Advanced features like redaction and combining documents are available with a Pro subscription.

**Highlights:** View and search PDFs, Annotate with highlights and notes, Sign documents digitally, Fill out PDF forms, Organize and share documents, Import from cloud services

**Features:** Family Sharing, iMessage stickers

**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


### Hi Assistant

[App page](https://appshunter.io/ios/app/hi-assistant/id1665814139)

This AI-powered assistant uses natural language processing to engage in human-like conversations. It can help with writing, programming, research, translation, and creative tasks by understanding prompts and providing detailed responses.

**Highlights:** Natural language conversation, AI-driven responses, Writing assistance, Programming help, Research support, Language translation

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 month | $9.99 | per month |
| 6 months | $39.99 | per 6 months |
| 12 months | $69.99 | per year |
| 50 questions | $0.99 | one-time |
| 80 questions | $1.99 | one-time |
| 10.000 tokens | $2.99 | one-time |
| 20.000 tokens | $4.99 | one-time |


## Frequently asked questions

### Is PDF Viewer by Nutrient free?

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

### Is Hi Assistant free?

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

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

PDF Viewer by Nutrient is rated higher. PDF Viewer by Nutrient averages 4.6 out of 5 from 9.1K ratings, while Hi Assistant averages 3.3 from 27 ratings.

### Do PDF Viewer by Nutrient or Hi Assistant have ads?

Hi Assistant shows ads; PDF Viewer by Nutrient does not.

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

PDF Viewer by Nutrient ships an update monthly, and Hi Assistant every 2 weeks. Most recently, PDF Viewer by Nutrient was updated on October 24, 2026 and Hi Assistant on October 24, 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.*