# ScrollWave vs Sumi Book

The clearest difference is in-app purchases: ScrollWave at none against Sumi Book's 3. Sumi Book's advantage is update cadence (every 5 days vs fortnightly) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. Sumi Book sells 3 in-app purchases, starting at $3.99 per month. ScrollWave asks for nothing beyond the download.

ScrollWave ships an update fortnightly, Sumi Book every 5 days. The most recent releases landed on October 25, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | ScrollWave | Sumi Book |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 5 days** |
| Size | 21 MB | 53 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [Alexander Biskaev](https://appshunter.io/developer/1881201355) | [Oktay Demir](https://appshunter.io/developer/6777725671) |

## What reviewers say

### ScrollWave

[App page](https://appshunter.io/ios/app/scrollwave/id6759850217)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sumi Book

[App page](https://appshunter.io/ios/app/sumi-book/id6777730252)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| The Fine Press — Monthly | $3.99 | per month |
| The Fine Press — Annual | $24.99 | per year |
| The Fine Press — Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is ScrollWave free?

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

### Is Sumi Book free?

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

### Do ScrollWave or Sumi Book have ads?

Neither ScrollWave nor Sumi Book shows ads.

### Which is updated more often, ScrollWave or Sumi Book?

ScrollWave ships an update fortnightly, and Sumi Book every 5 days. Most recently, ScrollWave was updated on October 25, 2026 and Sumi Book on November 5, 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.*