# HemiStim vs Feather Squadron

The clearest difference is price: Feather Squadron at Free against HemiStim's $9.99. Feather Squadron also leads on update cadence (every 3 months vs every 8 months) and iOS requirement (9.0 vs 12.0). HemiStim's advantage is device support (3 vs 1). On ads and in-app purchases there is nothing between them.

Feather Squadron is free to download; HemiStim costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HemiStim ships an update every 8 months, Feather Squadron every 3 months. Both last shipped on October 26, 2026.

## The numbers

| Metric | HemiStim | Feather Squadron |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[2.4 (5 ratings)](https://appshunter.io/ios/app/hemistim/id521313664/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 37.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 3 months** |
| Monetization | Paid | — |
| Size | 1 MB | 27 MB |
| Requires iOS | 12.0 | **9.0** |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Linsay Associates, LLC](https://appshunter.io/developer/326305565) | [Acoustic Pioneer](https://appshunter.io/developer/619517178) |

## What reviewers say

### HemiStim

[App page](https://appshunter.io/ios/app/hemistim/id521313664)

This app offers visual stimulation for specific brain lobes, aiding in hemispheric connectivity. It utilizes color patterns and eye-tracking exercises for targeted left or right brain stimulation, controllable via simple taps and swipes. Therapy sessions are automatically tracked and can be emailed to clinicians.

**Highlights:** Visual stimulation of frontal, parietal, occipital, temporal lobes, Hemispheric brain stimulation, Color pattern selection, Eye tracking for saccadic and pursuit movements, Adjustable blink rate and timer, Automatic therapy session tracking, Clinician-patient email communication

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

**In-app purchases:** none


### Feather Squadron

[App page](https://appshunter.io/ios/app/feather-squadron-england/id975405835)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HemiStim free?

HemiStim costs $9.99, with no in-app purchases.

### Is Feather Squadron free?

Feather Squadron is free to download, with no in-app purchases.

### Do HemiStim or Feather Squadron have ads?

Neither HemiStim nor Feather Squadron shows ads.

### Which is updated more often, HemiStim or Feather Squadron?

HemiStim ships an update every 8 months, and Feather Squadron every 3 months. Most recently, HemiStim was updated on October 26, 2026 and Feather Squadron on October 26, 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.*