dob vs PreNumbers
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
dob
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.
- 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
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Visual perception training Basic version for learners containing a set of 10 fixed exercises, covering the most important visual skills. Additionally there is an import area for 10 more exercises where you are able to import more exercises from dob pro - the full version for teachers and therapists. Supported languages: English, Spanish, Portuguese, German, French, Italian With the assistance of dob the learners are stimulated and supported in the following areas: Visual Attention Ocular motility Hand and Eye Coordination Motion Perception Contrast Sensitivity Face recognition and facial expression recognition Color Recognition and differentiation Figure-Ground Perception Object recognition and differentiation Visual Memory Search Strategies dob pro the full version for therapists, coaches and teachers, containing more than 2500 exercises for the training and observation of 11 basic visual skills Change size of objects or tracks with gestures, modify opacity and background. This is how to adapt the exercises to the individual needs of the learners. dob offers exercises both for adults and for children of any age. The training is suited specifically for the following area of application: Curative education - People with developmental delays, visual impairment or multiple disabilities Early childhood education - All children aged 2 to 6 years Physical rehabilitation - For example, after stroke Psychomotricity, occupational therapy and speech therapy User guide, object list, track list, video tutorials, subscription to newsletter » www.dob.li
PreNumbers
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PreNumbers is an application that provides basic pre-numeric skills. PreNumbers for iPad is available in 2 versions: - PreNumbers: Only a limited number of exercises can be used. An In-App Purchase is required to use all exercises. - PreNumbers PRO: All exercises can be used without limitation. Pre-numeric skills include: Sorting things by specific characteristics Dividing things into classes with specific characteristics Recognize and distinguish shapes Quantify and compare quantities Detect seriality (recognize logical sequences and continue) Recognize symmetries and patterns The application offers exercises for different skills in multiple difficulty levels. A simple presentation (forest theme) supports concentration on the essentials. A childlike design was avoided, to make the app appealing also for older children and adolescents. Completed exercises are recorded by the application to document the learning progress. To enable the use of this application with several people, a user manager is offered. Individual settings and results will be saved and can be loaded quickly. The exercises can be operated by alternative input devices such as external switches. Objectives: Train pre-numeric skills Playing Areas of application: Pre-school children Children and adults with learning disabilities
Verdict
The clearest difference is price: PreNumbers at Free against dob's $2.99. dob's advantage is update cadence (every 3 months vs every 8 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
PreNumbers is free to download; dob costs $2.99 up front. dob sells 1 one-off in-app purchase and PreNumbers sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
dob ships an update every 3 months, PreNumbers every 8 months. The most recent releases landed on October 1, 2026 and September 25, 2026 respectively.
| Parameter | dob | PreNumbers |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 months — better | Every 8 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Paid | — |
| Devices | iPad | iPad |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 78 MB | 42 MB |
| Age rating | 4+ | 4+ |
| Developer | Rene Fehr-Biscioni | IntegraTools GmbH |
In-app purchases
dob
- All exercises$11.99
PreNumbers
- All exercises$44.99








