# DPM Scan Pro vs sketchbookDuo

DPM Scan Pro and sketchbookDuo are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

DPM Scan Pro ships an update monthly, sketchbookDuo every 3 weeks. The most recent releases landed on October 14, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | DPM Scan Pro | sketchbookDuo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sketchbookduo/id6745931339/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 18 MB | 5 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Additive Marking GmbH](https://appshunter.io/developer/1585964987) | [Tocho Marking Systems, Inc.](https://appshunter.io/developer/1159545791) |

## What reviewers say

### DPM Scan Pro

[App page](https://appshunter.io/ios/app/dpm-scan-pro/id1585964985)

**Features:** macOS Compatibility

**In-app purchases:** none


### sketchbookDuo

[App page](https://appshunter.io/ios/app/sketchbookduo/id6745931339)

Design, manage, and send marking data to compatible devices. Features a grid-based editor for precise text placement and robust file management for marking jobs. Connects wirelessly for efficient control of marking tasks.

**Highlights:** Grid-based editor, File management, Device connection, Marking control, Customizable grids

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

**In-app purchases:** none


## Frequently asked questions

### Is DPM Scan Pro free?

DPM Scan Pro is free to download, with no in-app purchases.

### Is sketchbookDuo free?

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

### Do DPM Scan Pro or sketchbookDuo have ads?

Neither DPM Scan Pro nor sketchbookDuo shows ads.

### Which is updated more often, DPM Scan Pro or sketchbookDuo?

DPM Scan Pro ships an update monthly, and sketchbookDuo every 3 weeks. Most recently, DPM Scan Pro was updated on October 14, 2026 and sketchbookDuo 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.*