# GM Hearing vs Harmonix OTC

The clearest difference is update cadence: Harmonix OTC at every 2 days against GM Hearing's every 6 weeks. Harmonix OTC also leads on iOS requirement (11.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

GM Hearing ships an update every 6 weeks, Harmonix OTC every 2 days. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | GM Hearing | Harmonix OTC |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 days** |
| Size | 148 MB | 128 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Goodmi Intelligent (Shenzhen) Co., Ltd.](https://appshunter.io/developer/1615937678) | [Huizhou Jinghao Medical Technology Co.,Ltd.](https://appshunter.io/developer/1543340471) |

## What reviewers say

### GM Hearing

[App page](https://appshunter.io/ios/app/gm-hearing/id6621245741)

**Features:** macOS Compatibility

**In-app purchases:** none


### Harmonix OTC

[App page](https://appshunter.io/ios/app/harmonix-otc/id6756475067)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GM Hearing free?

GM Hearing is free to download, with no in-app purchases.

### Is Harmonix OTC free?

Harmonix OTC is free to download, with no in-app purchases.

### Do GM Hearing or Harmonix OTC have ads?

Neither GM Hearing nor Harmonix OTC shows ads.

### Which is updated more often, GM Hearing or Harmonix OTC?

GM Hearing ships an update every 6 weeks, and Harmonix OTC every 2 days. Most recently, GM Hearing was updated on November 4, 2026 and Harmonix OTC on October 30, 2026.

---

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