# PDF Reader vs StampId

The clearest difference is review sentiment: StampId at 100% against PDF Reader's 56%. StampId also leads on ads (none vs shown) and rating (5.0 vs 4.7). PDF Reader's advantage is in-app purchases (none vs 2) and ratings volume (4.5K vs 2). On price, update cadence and device support there is nothing between them.

Both are free to download. StampId sells 2 in-app purchases, starting at $4.99 per month. PDF Reader asks for nothing beyond the download.

StampId holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: PDF Reader has 4.5K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 56% of PDF Reader's written reviews are positive against 100% of StampId's.

PDF Reader ships an update weekly, StampId fortnightly. The most recent releases landed on October 25, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | PDF Reader | StampId |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (4.5K ratings)](https://appshunter.io/ios/app/pdf-reader-easy-editor/id6630367408/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/stampid-stamp-identifier-and-value/id6758229154/reviews)** |
| Number of ratings | **4.5K** | 2 |
| Positive reviews | 55.9% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Fortnightly |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Best chart rank | **#155** | — |
| Size | 69 MB | 32 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SPARK TECH LIMITED](https://appshunter.io/developer/1709259681) | [Hangzhou Climbfyre Technology Co., Ltd.](https://appshunter.io/developer/1713920426) |

## What reviewers say

### PDF Reader

[App page](https://appshunter.io/ios/app/pdf-reader-easy-editor/id6630367408)

**Currently charting:** #155 Top Free · Utilities (US App Store)

Transform your smartphone into a powerful PDF scanner and editor. Easily convert images and documents to PDF, or convert PDFs to other formats. Protect your files with encryption and share them securely.

**Highlights:** Scan documents, Convert images to PDF, Convert PDF to other formats, Crop image sizes, Share documents, Add watermark, File encryption

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

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 💡 Useful features
- 🚀 Fast performance

**What reviewers complain about**

- 🐛 Crashes and bugs
- 💰 Excessive ads
- 🔋 Drains battery quickly

**Reported bugs**

- Login issues
- Compatibility problems with newer devices
- Frequent crashes and freezes

**Requested features**

- More customization options
- Improved privacy controls
- Better customer support


### StampId

[App page](https://appshunter.io/ios/app/stampid-stamp-identifier-and-value/id6758229154)

Instantly identify stamps with AI by taking a photo. Access historical details, market value estimates, and organize your collection digitally. Explore fascinating stamp histories and automatically save your discoveries.

**Highlights:** AI stamp identification, Market value estimation, Digital stamp albums, Historical stamp facts, Automatic scan history

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| StampId Premium Monthly | $4.99 | per month |
| StampId Premium Yearly | $29.99 | per year |


## Frequently asked questions

### Is PDF Reader free?

PDF Reader is free to download, with no in-app purchases.

### Is StampId free?

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

### Which has better reviews, PDF Reader or StampId?

StampId is rated higher. PDF Reader averages 4.7 out of 5 from 4.5K ratings, while StampId averages 5.0 from 2 ratings.

### Do PDF Reader or StampId have ads?

PDF Reader shows ads; StampId does not.

### Which is updated more often, PDF Reader or StampId?

PDF Reader ships an update weekly, and StampId fortnightly. Most recently, PDF Reader was updated on October 25, 2026 and StampId on October 23, 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.*