# PDF Scanner vs Client Inbox

The clearest difference is in-app purchases: Client Inbox at none against PDF Scanner's 2. Client Inbox also leads on device support (3 vs 1) and iOS requirement (15.1 vs 17.6). PDF Scanner's advantage is update cadence (every 5 days vs every 2 months). On price and ads there is nothing between them.

Both are free to download. PDF Scanner sells 2 in-app purchases, starting at $3.99 per month. Client Inbox asks for nothing beyond the download.

PDF Scanner ships an update every 5 days, Client Inbox every 2 months. The most recent releases landed on September 13, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | PDF Scanner | Client Inbox |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 2 months |
| Size | 4 MB | 45 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SUNG HSIANG CHAO](https://appshunter.io/developer/1801925448) | [Cherwell Marketing Limited](https://appshunter.io/developer/1867576627) |

## What reviewers say

### PDF Scanner

[App page](https://appshunter.io/ios/app/pdf-scanner-optic-scan/id6755757455)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Optic Premium Monthly | $3.99 | per month |
| Optic Premium Yearly | $29.99 | per year |


### Client Inbox

[App page](https://appshunter.io/ios/app/client-inbox/id6757547846)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PDF Scanner free?

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

### Is Client Inbox free?

Client Inbox is free to download, with no in-app purchases.

### Do PDF Scanner or Client Inbox have ads?

Neither PDF Scanner nor Client Inbox shows ads.

### Which is updated more often, PDF Scanner or Client Inbox?

PDF Scanner ships an update every 5 days, and Client Inbox every 2 months. Most recently, PDF Scanner was updated on September 13, 2026 and Client Inbox on September 8, 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.*