Comparison

OKN Drum vs Focus Builder Pro

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

Head to head
About

OKN Drum

This app offers a digital optokinetic drum for vision testing and exercises. Customize stripe width, speed, and color, with options for pediatric targets. It also features a metronome and camera recording for eye movements.

Highlights
  • Adjustable stripe width and speed
  • Selectable black or red stripes
  • Pediatric targets (puppies, dinosaurs, animals)
  • Full-screen mode
  • Integrated metronome
  • Record eye movements with camera
  • Upload custom images for drum
Features
Read full description

IN-APP PURCHASE REQUIRED FOR USE · OKN Drum Pro provides an Optokinetic Nystagmus (OKN) Drum featuring multiple modes for optokinetic testing and exercises. Users can adjust the stripe width to their preference using the pinch-to-zoom functionality. · The speed of the OKN stripes is easily adjustable, enabling quick increases or decreases as desired. · Users have the option to select either black or red stripes to suit their visual requirements. · Includes multiple pediatric targets, such as puppies, dinosaurs, and various animal targets. · By tapping the stripes, users can enter full-screen mode for an immersive experience. · A metronome is also available to assist with timing exercises, enhancing the overall utility of the app for therapeutic and testing purposes. · Record eye movements with the front facing camera · Upload images for a custom OKN drum · Flick the OKN graphic to simulate rotating an OKN drum This app is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your doctor or a qualified healthcare provider before making any medical decisions. If you think you may have a medical emergency, call emergency services immediately.

About

Focus Builder Pro

This app offers targeted eye movement exercises designed to enhance brain plasticity and neurotherapeutic outcomes. It provides customizable exercises and patient session building for practitioners, and permanent access to exercises for patients under guidance.

Highlights
  • Targeted eye movement exercises
  • Brain plasticity enhancement
  • Customizable exercise settings
  • Patient session builder
  • Progress monitoring
  • Neurotherapeutic outcomes
Features
Read full description

Focus Builder: Targeted Eye Movement Exercises for Functional Neurologists and Patients Focus Builder is an iPad-optimized app delivering evidence-based eye movement exercises to promote brain plasticity and neurotherapeutic outcomes. Access requires creating an account and selecting your role: Subscription & Access Details Focus Builder requires role selection upon signup: Practitioner (Functional Neurologist) or Patient. This choice is permanent. - For Practitioners: Auto-Renewing Subscription Unlocking: - Access to 12 exercises with lots of customizable settings. Create new exercises based on the settings + sequences of exercises. - Patient session builder: Create and assign personalized exercise sequences for your patients, including progress monitoring and adjustment based on outcomes. Subscriptions auto-renew via Apple and can be managed in your App Store account. No free trial, but full access starts immediately upon purchase. Cancel anytime. - For Patients: One-Time In-App Purchase Permanent access to all exercises under your practitioner's guidance. No ongoing fees—includes any sequences assigned by your doctor for personalized therapy or usage of the exercises. Payment details are shown in your user profile after login. Role selection is permanent and cannot be changed later. No free trial or limited access—full functionality begins after purchase. Eye movements are a very powerful way to exercise the brain and to create long-term change in the brain, known as plasticity. The “Focus Builder” app contains a variety of exercises which challenge users to voluntarily move their eyes in various patterns, speeds and directions, which have been proven to activate specific parts of the brain depending on which eye movement is performed. This app is specifically designed for doctors that specialize in Functional Neurology and their patients. There is currently no app available that can provide these specific exercises. For best results, patients should consult a Functional Neurologist to determine how to use this app according to their needs and obtain the most therapeutic value. There are 3 types of eye movements that can have profound therapeutic benefits and all three are available in this app. 1.Pursuits (slow eye movements): Smooth pursuit eye movements allow the eyes to closely follow a moving object. Most people are unable to initiate pursuit without a moving visual signal. The pursuit of targets moving with velocities of greater than 30°/s tend to require catch-up saccades. 2.Saccades (fast eye movements): Saccades are quick, simultaneous movements of both eyes in the same direction. Initiated cortically by the frontal eye fields (FEF), or subcortically by the superior colliculus, saccades serve as a mechanism for fixation, rapid eye movement, and the fast phase of optokinetic nystagmus. 3.Anti-saccades (look away): The anti-saccade task has emerged as an important task for investigating the flexible control that we have over behavior. In this task, participants must suppress the reflexive urge to look at a visual target that appears suddenly in the peripheral visual field and must instead look away from the target in the opposite direction. A crucial step involved in performing this task is the top-down inhibition of a reflexive, automatic saccade. Patients diagnosed with various neurological and/or psychiatric disorders that affect the frontal lobes or basal ganglia find it difficult to suppress the automatic pro-saccade, revealing a deficit in top-down inhibition. The areas of the brain that are activated by these eye movements are too numerous to list, but to name a few, I have listed some of the functions that can improve with these eye exercises. 1.Executive function/behavior 2.Attention 3.Concentration 4.Impulse control 5.Social behavior 6.Motivation 7.Goal directed behavior Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

OKN Drum4 screens
Focus Builder Pro4 screens

Verdict

The call

The clearest difference is review sentiment: OKN Drum at 46% against Focus Builder Pro's 0%. OKN Drum also leads on ratings volume (16 vs 2). Focus Builder Pro's advantage is rating (5.0 vs 4.1) and monetization model (freemium vs paid). On price, update cadence, ads and in-app purchases 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

Both are free to download. OKN Drum sells 1 one-off in-app purchase and Focus Builder Pro sells 3 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Focus Builder Pro holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: OKN Drum has 16 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 46% of OKN Drum's written reviews are positive against 0% of Focus Builder Pro's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

OKN Drum ships an update every 9 days, Focus Builder Pro every 10 days. The most recent releases landed on September 22, 2026 and September 13, 2026 respectively.

Scorecard5 real differences · 5 level
OKN Drum versus Focus Builder Pro: the parameters behind the verdict, then further details
ParameterOKN DrumFocus Builder Pro
PriceFreeFree
Rating4.1 (16 ratings)5.0 (2 ratings) — better
Positive reviews46.2% of reviews — better0.0% of reviews
Number of ratings16 — better2
Update frequencyEvery 9 days — betterEvery 10 days
AdsNoNo
In-app purchasesYesYes
MonetizationPaidFreemium — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.1 — better
Further details — not scored
Size13 MB50 MB
Age rating4+17+
DeveloperMy Call Bag LLCNeurdSolutions, LLC

Customer experience

OKN Drum

All ratings16 ratings
Positive68.8%
Neutral12.5%
Negative18.8%
Written reviews13 reviews
Positive46.2%
Neutral0.0%
Negative53.8%

Focus Builder Pro

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

1 purchases

OKN Drum

One-time1
  • Lifetime Access$4.99
3 purchases

Focus Builder Pro

Subscriptions2
  • Focus Builder Pro Practitioner$9.991 Month
  • Focus Builder Pro Practitioner$69.991 Year
One-time1
  • Patient Purchase$19.99

Questions

Is OKN Drum free?
OKN Drum is free to download, with in-app purchases available.
Is Focus Builder Pro free?
Focus Builder Pro is free to download, with in-app purchases available.
Which has better reviews, OKN Drum or Focus Builder Pro?
Focus Builder Pro is rated higher. OKN Drum averages 4.1 out of 5 from 16 ratings, while Focus Builder Pro averages 5.0 from 2 ratings.
Do OKN Drum or Focus Builder Pro have ads?
Neither OKN Drum nor Focus Builder Pro shows ads.
Which is updated more often, OKN Drum or Focus Builder Pro?
OKN Drum ships an update every 9 days, and Focus Builder Pro every 10 days. Most recently, OKN Drum was updated on September 22, 2026 and Focus Builder Pro on September 13, 2026.

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