# PDR測位 vs PDF Scanner · OCR Docs

The clearest difference is in-app purchases: PDR測位 at none against PDF Scanner · OCR Docs's 1. PDR測位 also leads on ads (none vs shown). PDF Scanner · OCR Docs's advantage is update cadence (every 3 days vs every 12 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. PDF Scanner · OCR Docs sells 1 one-off in-app purchase. PDR測位 asks for nothing beyond the download.

PDR測位 ships an update every 12 months, PDF Scanner · OCR Docs every 3 days. The most recent releases landed on September 14, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | PDR測位 | PDF Scanner · OCR Docs |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 12 months | **Every 3 days** |
| Size | 3 MB | 94 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Musen Connect, Inc.](https://appshunter.io/developer/1570398182) | [UPDEITO INC.](https://appshunter.io/developer/1113275046) |

## What reviewers say

### PDR測位

[App page](https://appshunter.io/ios/app/pdr/id6448334677)

**Features:** macOS Compatibility

**In-app purchases:** none


### PDF Scanner · OCR Docs

[App page](https://appshunter.io/ios/app/pdf-scanner-ocr-docs/id6757154986)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hide ads | $12.99 | one-time |


## Frequently asked questions

### Is PDR測位 free?

PDR測位 is free to download, with no in-app purchases.

### Is PDF Scanner · OCR Docs free?

PDF Scanner · OCR Docs is free to download, with in-app purchases available.

### Do PDR測位 or PDF Scanner · OCR Docs have ads?

PDF Scanner · OCR Docs shows ads; PDR測位 does not.

### Which is updated more often, PDR測位 or PDF Scanner · OCR Docs?

PDR測位 ships an update every 12 months, and PDF Scanner · OCR Docs every 3 days. Most recently, PDR測位 was updated on September 14, 2026 and PDF Scanner · OCR Docs on September 10, 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.*