# HSA vs Sound Amplifier +

The clearest difference is ads: HSA at none against Sound Amplifier +'s shown. HSA also leads on device support (3 vs 1) and iOS requirement (9.0 vs 16.4). Sound Amplifier +'s advantage is update cadence (every 4 days vs every 2 months). On price and in-app purchases there is nothing between them.

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

HSA ships an update every 2 months, Sound Amplifier + every 4 days. The most recent releases landed on November 12, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | HSA | Sound Amplifier + |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.1 (15 ratings)](https://appshunter.io/ios/app/sound-amplifier-plus/id6782403208/reviews)** |
| Number of ratings | — | **15** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | — | Ad-supported |
| Size | 6 MB | 88 MB |
| Requires iOS | **9.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [杏生 卢](https://appshunter.io/developer/1094592555) | [heekyung moon](https://appshunter.io/developer/6779193748) |

## What reviewers say

### HSA

[App page](https://appshunter.io/ios/app/hsa-10pro/id6446188767)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sound Amplifier +

[App page](https://appshunter.io/ios/app/sound-amplifier-plus/id6782403208)

Enhance your hearing with real-time audio amplification and sound adjustment. This tool boosts voices and sounds through your earphones, offers a replay function for missed audio, and includes a personalized EQ based on a hearing test. It also features noise reduction and a safety limiter for a clearer listening experience.

**Highlights:** Real-time audio amplification, Replay last 10 seconds, Personalized EQ via hearing test, Voice leveller, Noise reduction, Customizable setups

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

**In-app purchases:** none


## Frequently asked questions

### Is HSA free?

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

### Is Sound Amplifier + free?

Sound Amplifier + is free to download, with no in-app purchases.

### Do HSA or Sound Amplifier + have ads?

Sound Amplifier + shows ads; HSA does not.

### Which is updated more often, HSA or Sound Amplifier +?

HSA ships an update every 2 months, and Sound Amplifier + every 4 days. Most recently, HSA was updated on November 12, 2026 and Sound Amplifier + on November 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.*