# ID vs Optical Illusion Book

The clearest difference is iOS requirement: ID at 13.0 against Optical Illusion Book's 18.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. ID sells 1 one-off in-app purchase and Optical Illusion Book sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | ID | Optical Illusion Book |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 81.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 17 MB | 4 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [INITREE Software GmbH](https://appshunter.io/developer/1309493226) | [Mishima Design](https://appshunter.io/developer/373060551) |

## What reviewers say

### ID

[App page](https://appshunter.io/ios/app/id-logics/id1309493227)

Easily identify species with this intelligent app. It asks targeted questions based on observable characteristics to help you determine plants and animals. Discover nature's diversity offline, with helpful guides and the ability to log your findings.

**Highlights:** Intelligent questioning for easy identification, Offline functionality, Supports multiple species groups, Interactive and error-tolerant, Visual and textual verification aids, Log sightings with GPS and photos

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bäume und Sträucher | $2.99 | one-time |


### Optical Illusion Book

[App page](https://appshunter.io/ios/app/optical-illusion-book/id6801408868)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Complete Collection | $14.99 | one-time |


## Frequently asked questions

### Is ID free?

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

### Is Optical Illusion Book free?

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

### Do ID or Optical Illusion Book have ads?

Neither ID nor Optical Illusion Book shows ads.

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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.*