# OKN Drum vs Focus Builder Pro

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.

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.

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.

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.

## The numbers

| Metric | OKN Drum | Focus Builder Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (16 ratings)](https://appshunter.io/ios/app/okn-drum-optokinetic/id6474153180/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/focus-builder-pro/id6751810825/reviews)** |
| Number of ratings | **16** | 2 |
| Positive reviews | **46.2% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 10 days |
| Monetization | Paid | **Freemium** |
| Size | 13 MB | 50 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [My Call Bag LLC](https://appshunter.io/developer/1243282862) | [NeurdSolutions, LLC](https://appshunter.io/developer/950133465) |

## What reviewers say

### OKN Drum

[App page](https://appshunter.io/ios/app/okn-drum-optokinetic/id6474153180)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $4.99 | one-time |


### Focus Builder Pro

[App page](https://appshunter.io/ios/app/focus-builder-pro/id6751810825)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Focus Builder Pro Practitioner | $9.99 | per month |
| Focus Builder Pro Practitioner | $69.99 | per year |
| Patient Purchase | $19.99 | one-time |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*