# dob vs Signs & Sounds

The clearest difference is price: Signs & Sounds at Free against dob's $2.99. Signs & Sounds also leads on in-app purchases (none vs 1) and iOS requirement (10.0 vs 12.0). On update cadence, ads and device support there is nothing between them.

Signs & Sounds is free to download; dob costs $2.99 up front. dob sells 1 one-off in-app purchase. Signs & Sounds asks for nothing beyond the download.

dob ships an update every 3 months, Signs & Sounds every 6 months. The most recent releases landed on October 17, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | dob | Signs & Sounds |
| --- | --- | --- |
| 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 | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 6 months |
| Monetization | Paid | — |
| Size | 78 MB | 249 MB |
| Requires iOS | 12.0 | **10.0** |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Rene Fehr-Biscioni](https://appshunter.io/developer/969998405) | [Royal Institute for Deaf and Blind Children](https://appshunter.io/developer/307217029) |

## 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 (1)**

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


### Signs & Sounds

[App page](https://appshunter.io/ios/app/signs-and-sounds/id1215460660)

**In-app purchases:** none


## Frequently asked questions

### Is dob free?

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

### Is Signs & Sounds free?

Signs & Sounds is free to download, with no in-app purchases.

### Do dob or Signs & Sounds have ads?

Neither dob nor Signs & Sounds shows ads.

### Which is updated more often, dob or Signs & Sounds?

dob ships an update every 3 months, and Signs & Sounds every 6 months. Most recently, dob was updated on October 17, 2026 and Signs & Sounds on October 26, 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.*