# PDF Viewer vs Notsure

The clearest difference is update cadence: Notsure at weekly against PDF Viewer's every 3 months. PDF Viewer's advantage is iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. PDF Viewer sells 2 in-app purchases, starting at $4.99 per month and Notsure sells 1 in-app purchase, starting at $19.99 per year. Whichever you choose, the download price is not the number that matters.

PDF Viewer ships an update every 3 months, Notsure weekly. The most recent releases landed on October 24, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | PDF Viewer | Notsure |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (243 ratings)](https://appshunter.io/ios/app/pdf-viewer-reader-and-editor/id6720703022/reviews)** | — |
| Number of ratings | **243** | — |
| Positive reviews | 89.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | Freemium | — |
| Size | 11 MB | 3 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Andrew Lee](https://appshunter.io/developer/1206652057) | [Hsieh ChiaMing](https://appshunter.io/developer/1891046685) |

## What reviewers say

### PDF Viewer

[App page](https://appshunter.io/ios/app/pdf-viewer-reader-and-editor/id6720703022)

Easily convert various file formats to PDF and back again. This app supports conversions from images, documents, and presentations, allowing you to manage and share your files efficiently. It also offers OCR capabilities to convert photos into editable text.

**Highlights:** Convert JPG, Word, Excel, PPT to PDF, Convert PDF to other formats, Share and save converted files, Access conversion history, Pull files from iCloud or gallery, Convert Photos to Text (OCR)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Converter: Premium | $4.99 | per month |
| PDF Converter: Premium | Free | one-time |

**What reviewers like**

- 👍 Easy and intuitive to use
- 🚀 Fast and efficient conversion
- 💰 Free or affordable pricing
- 📄 Excellent PDF conversion and merging capabilities
- 🎨 Clean and simple interface design

**What reviewers complain about**

- 🐛 Forced review prompt before app usage
- ❌ Missing file deletion option
- 📸 No in-app camera scanning capability
- ⚙️ No file size customization options
- 🔄 Inconsistent performance across devices

**Reported bugs**

- App doesn't function on iPad mini (current model)
- Forced review requirement blocks app access
- Document quality issues when converting images to PDF
- Occasional glitches during operation

**Requested features**

- Add file deletion functionality
- Implement in-app camera scanning feature
- Add page merge and delete options
- Include file size/quality customization
- Support for more device types (iPad compatibility)


### Notsure

[App page](https://appshunter.io/ios/app/notsure/id6761713945)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Notsure Annual | $19.99 | per year |


## Frequently asked questions

### Is PDF Viewer free?

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

### Is Notsure free?

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

### Do PDF Viewer or Notsure have ads?

Neither PDF Viewer nor Notsure shows ads.

### Which is updated more often, PDF Viewer or Notsure?

PDF Viewer ships an update every 3 months, and Notsure weekly. Most recently, PDF Viewer was updated on October 24, 2026 and Notsure on October 13, 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.*