# dob vs ChessClues

The clearest difference is price: ChessClues at Free against dob's $2.99. ChessClues also leads on device support (3 vs 1). dob's advantage is in-app purchases (none vs 2) and iOS requirement (12.0 vs 15.0). On ads there is nothing between them.

ChessClues is free to download; dob costs $2.99 up front. ChessClues sells 2 in-app purchases, starting at $14.99 per year. dob asks for nothing beyond the download.

## The numbers

| Metric | dob | ChessClues |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/dob-visual-perception/id981954512/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | Paid | — |
| Size | 78 MB | 58 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Rene Fehr-Biscioni](https://appshunter.io/developer/969998405) | [Santosh Hegde](https://appshunter.io/developer/1820065959) |

## What reviewers say

### dob

[App page](https://appshunter.io/ios/app/dob-visual-perception/id981954512)

This app offers exercises to train essential visual skills like attention, coordination, and memory. It's designed for learners of all ages, including children and individuals undergoing rehabilitation, and can be customized to individual needs.

**Highlights:** Visual Attention training, Ocular motility exercises, Hand and Eye Coordination, Motion Perception, Contrast Sensitivity, Face and facial expression recognition, Color Recognition and differentiation, Figure-Ground Perception

**In-app purchases:** none


### ChessClues

[App page](https://appshunter.io/ios/app/chessclues-chess-patterns/id6814923344)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access — 1 Year | $14.99 | per year |
| All Access — Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is dob free?

dob costs $2.99, with no in-app purchases.

### Is ChessClues free?

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

### Do dob or ChessClues have ads?

Neither dob nor ChessClues 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.*