Comparison

dob vs PreNumbers

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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

About

PreNumbers

Features
Read full description

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 call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 8 level
dob versus PreNumbers: the parameters behind the verdict, then further details
ParameterdobPreNumbers
Price$2.99Free — better
Rating1.0 (1 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 3 months — betterEvery 8 months
AdsNoNo
In-app purchasesYesYes
MonetizationPaid—
DevicesiPadiPad
Requires iOS12.012.0
Further details — not scored
Size78 MB42 MB
Age rating4+4+
DeveloperRene Fehr-BiscioniIntegraTools GmbH

In-app purchases

1 purchases

dob

One-time1
  • All exercises$11.99
1 purchases

PreNumbers

One-time1
  • All exercises$44.99

Questions

Is dob free?
dob costs $2.99, and also offers in-app purchases.
Is PreNumbers free?
PreNumbers is free to download, with in-app purchases available.
Do dob or PreNumbers have ads?
Neither dob nor PreNumbers shows ads.
Which is updated more often, dob or PreNumbers?
dob ships an update every 3 months, and PreNumbers every 8 months. Most recently, dob was updated on October 1, 2026 and PreNumbers on September 25, 2026.

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