# Combinations for Kids vs dob

The clearest difference is in-app purchases: Combinations for Kids at none against dob's 1. Combinations for Kids also leads on price ($0.99 vs $2.99) and device support (3 vs 1). dob's advantage is iOS requirement (12.0 vs 15.6). On update cadence and ads there is nothing between them.

Combinations for Kids costs $0.99 and dob $2.99 up front. dob sells 1 one-off in-app purchase. Combinations for Kids asks for nothing beyond the download.

Combinations for Kids ships an update every 4 months, dob every 3 months. The most recent releases landed on October 26, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Combinations for Kids | dob |
| --- | --- | --- |
| Price | **$0.99** | $2.99 |
| 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 4 months | **Every 3 months** |
| Monetization | — | Paid |
| Size | 22 MB | 78 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sergey Rozovik](https://appshunter.io/developer/587833213) | [Rene Fehr-Biscioni](https://appshunter.io/developer/969998405) |

## What reviewers say

### Combinations for Kids

[App page](https://appshunter.io/ios/app/combinations-for-kids/id592775574)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All exercises | $11.99 | one-time |


## Frequently asked questions

### Is Combinations for Kids free?

Combinations for Kids costs $0.99, with no in-app purchases.

### Is dob free?

dob costs $2.99, and also offers in-app purchases.

### Do Combinations for Kids or dob have ads?

Neither Combinations for Kids nor dob shows ads.

### Which is updated more often, Combinations for Kids or dob?

Combinations for Kids ships an update every 4 months, and dob every 3 months. Most recently, Combinations for Kids was updated on October 26, 2026 and dob on October 17, 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.*