Comparison

King 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

King

This application assists individuals with eye movement deficits stemming from neurological impairment. It facilitates practice with an oculomotor program, presenting number targets for reading aloud to improve vision-related symptoms after brain injury. The program offers adjustable speed settings and tracks progress.

Highlights
  • Oculomotor program practice
  • Dynamic number target presentation
  • Adjustable speed settings
  • Instant outcome measures
  • Compliance monitoring
  • Requires existing account
Features
Read full description

King-Devick Recovery Practice is the companion iPad App for the K-D Recovery Acceleration Program (K-D RAP) and helps individuals with eye movement deficits as a result of neurological impairment. Why K-D Recovery Acceleration Program? Following a brain injury, up to 90% of individuals experience vision-related symptoms. K-D RAP is a web and app-based oculomotor program. The individual reads aloud dynamically presented number targets quickly on a computer or iPad. Speed settings are easily adjusted and increased with ongoing practice. K-D RAP provides instant outcome measures and compliance monitoring over the course of recovery. About this App This app can only be used with an existing King-Devick Recovery Acceleration Program account and requires internet access to function. King-Devick Recovery Practice is intended for practicing individuals. It has been validated on iPads with a 9.7" display or larger.

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
Currently charting
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

Focus Builder Pro4 screens

Verdict

The call

The clearest difference is in-app purchases: King at none against Focus Builder Pro's 3. King also leads on iOS requirement (11.0 vs 15.1). Focus Builder Pro's advantage is update cadence (every 2 weeks vs every 19 months) and chart position (#108 vs unranked). On price, rating, ratings volume and ads 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. Focus Builder Pro sells 3 in-app purchases, starting at $9.99 per month. King asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for King against 5.0 for Focus Builder Pro. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

UpkeepUpdate frequency

King ships an update every 19 months, Focus Builder Pro every 2 weeks. The most recent releases landed on October 7, 2026 and October 1, 2026 respectively.

Scorecard6 real differences · 5 level
King versus Focus Builder Pro: the parameters behind the verdict, then further details
ParameterKingFocus Builder Pro
PriceFreeFree
Rating5.0 (2 ratings)5.0 (2 ratings)
Positive reviews—0.0% of reviews
Number of ratings22
Update frequencyEvery 19 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
Best chart rank—#108 — better
DevicesiPadiPhone, iPad, iPod — better
Requires iOS11.0 — better15.1
Further details — not scored
Size178 MB50 MB
Age rating4+17+
DeveloperKing-Devick Test, LLCNeurdSolutions, LLC

Customer experience

King

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Focus Builder Pro

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

In-app purchases

None

King

No in-app purchases

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 King free?
King is free to download, with no in-app purchases.
Is Focus Builder Pro free?
Focus Builder Pro is free to download, with in-app purchases available.
Which has better reviews, King or Focus Builder Pro?
King and Focus Builder Pro are both rated 5.0 out of 5 on the App Store, from 2 and 2 ratings respectively.
Do King or Focus Builder Pro have ads?
Neither King nor Focus Builder Pro shows ads.
Which is updated more often, King or Focus Builder Pro?
King ships an update every 19 months, and Focus Builder Pro every 2 weeks. Most recently, King was updated on October 7, 2026 and Focus Builder Pro on October 1, 2026.

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