# Brain Tool Kit vs Bay Fit

The clearest difference is price: Bay Fit at Free against Brain Tool Kit's $17.99. Bay Fit also leads on update cadence (fortnightly vs every 5 weeks) and iOS requirement (9.0.0 vs 15.0). Brain Tool Kit's advantage is chart position (#85 vs unranked). On ads, in-app purchases and device support there is nothing between them.

Bay Fit is free to download; Brain Tool Kit costs $17.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Brain Tool Kit ships an update every 5 weeks, Bay Fit fortnightly. The most recent releases landed on October 14, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Brain Tool Kit | Bay Fit |
| --- | --- | --- |
| Price | $17.99 | **Free** |
| Rating | **[4.3 (6 ratings)](https://appshunter.io/ios/app/brain-tool-kit/id1532827079/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Monetization | Paid | — |
| Best chart rank | **#85** | — |
| Size | 57 MB | 54 MB |
| Requires iOS | 15.0 | **9.0.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rehab Lab](https://appshunter.io/developer/1532827081) | [Bay Fit LLC](https://appshunter.io/developer/1560784337) |

## What reviewers say

### Brain Tool Kit

[App page](https://appshunter.io/ios/app/brain-tool-kit/id1532827079)

**Currently charting:** #85 Top Paid · Health & Fitness (US App Store)

This app offers a suite of brain-training exercises utilizing eye movements, memory, and colored stimuli. It includes interactive tests for attention, concentration, and memory, with customizable settings for speed and duration.

**Highlights:** Eye movement exercises (gaze fixation, pursuits, OPK), Interactive Stroop test, Random letter display for word recall, Customizable speed and duration for activities, Target color options (green, red, blue), Improves attention, concentration, and working memory

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Bay Fit

[App page](https://appshunter.io/ios/app/bay-fit/id1560784335)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Brain Tool Kit free?

Brain Tool Kit costs $17.99, with no in-app purchases.

### Is Bay Fit free?

Bay Fit is free to download, with no in-app purchases.

### Do Brain Tool Kit or Bay Fit have ads?

Neither Brain Tool Kit nor Bay Fit shows ads.

### Which is updated more often, Brain Tool Kit or Bay Fit?

Brain Tool Kit ships an update every 5 weeks, and Bay Fit fortnightly. Most recently, Brain Tool Kit was updated on October 14, 2026 and Bay Fit on October 10, 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.*