# Doosan Authenticator vs Picbook

The clearest difference is in-app purchases: Doosan Authenticator at none against Picbook's 2. Doosan Authenticator also leads on iOS requirement (15.6 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Picbook sells 2 in-app purchases, starting at $1.99 per month. Doosan Authenticator asks for nothing beyond the download.

Doosan Authenticator ships an update fortnightly, Picbook every 11 days. The most recent releases landed on October 11, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Doosan Authenticator | Picbook |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 11 days** |
| Size | 13 MB | 3 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [KOREAEXPERT](https://appshunter.io/developer/1161606505) | [XTI Co.,Ltd.](https://appshunter.io/developer/1533410506) |

## What reviewers say

### Doosan Authenticator

[App page](https://appshunter.io/ios/app/doosan-authenticator/id1441507873)

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

**In-app purchases:** none


### Picbook

[App page](https://appshunter.io/ios/app/picbook-web-image-viewer/id6801503106)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Picbook Pro Monthly | $1.99 | per month |
| Picbook Pro | $9.99 | one-time |


## Frequently asked questions

### Is Doosan Authenticator free?

Doosan Authenticator is free to download, with no in-app purchases.

### Is Picbook free?

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

### Do Doosan Authenticator or Picbook have ads?

Neither Doosan Authenticator nor Picbook shows ads.

### Which is updated more often, Doosan Authenticator or Picbook?

Doosan Authenticator ships an update fortnightly, and Picbook every 11 days. Most recently, Doosan Authenticator was updated on October 11, 2026 and Picbook on October 9, 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.*