# Interactive Sketchbook vs ACO Viewer

The clearest difference is price: ACO Viewer at Free against Interactive Sketchbook's $4.99. ACO Viewer also leads on in-app purchases (none vs 1) and iOS requirement (12.0 vs 17.6). On update cadence, ads and device support there is nothing between them.

ACO Viewer is free to download; Interactive Sketchbook costs $4.99 up front. Interactive Sketchbook sells 1 one-off in-app purchase. ACO Viewer asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 14, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Interactive Sketchbook | ACO Viewer |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/interactive-sketchbook/id418846451/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 42.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Free | — |
| Size | 345 MB | 100 MB |
| Requires iOS | 17.6 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Digital Wave Creative](https://appshunter.io/developer/418846454) | [AUGMENTED CITY SRL](https://appshunter.io/developer/1815788390) |

## What reviewers say

### Interactive Sketchbook

[App page](https://appshunter.io/ios/app/interactive-sketchbook/id418846451)

Learn professional illustration techniques with interactive tutorials and digital sketching tools. Practice drawing alongside a professional artist or import your own photo references. This app offers a digital alternative to traditional sketchbooks with advanced features for artists.

**Highlights:** Interactive tutorials from professional illustrator, Import photo references for drawing, Three custom layers for sketching and detailing, Split view for side-by-side drawing and reference, Full-page tracing and full-screen drawing modes, Unlimited pages and undo/redo functionality, Portfolio to store and manage digital art

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Paper Pack Pro | $3.99 | one-time |


### ACO Viewer

[App page](https://appshunter.io/ios/app/aco-viewer/id1621584555)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Interactive Sketchbook free?

Interactive Sketchbook costs $4.99, and also offers in-app purchases.

### Is ACO Viewer free?

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

### Do Interactive Sketchbook or ACO Viewer have ads?

Neither Interactive Sketchbook nor ACO Viewer shows ads.

### Which is updated more often, Interactive Sketchbook or ACO Viewer?

Interactive Sketchbook ships an update every 4 months, and ACO Viewer every 4 months. Most recently, Interactive Sketchbook was updated on October 14, 2026 and ACO Viewer on October 2, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*