# Sound Amplifier vs Scrap Science

The clearest difference is review sentiment: Scrap Science at 100% against Sound Amplifier's 34%. Sound Amplifier's advantage is ratings volume (1.2K vs 3) and rating (4.6 vs 4.3). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Sound Amplifier sells 4 in-app purchases, starting at $9.99 per month and Scrap Science sells 6 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Sound Amplifier holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: Sound Amplifier has 1.2K ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 34% of Sound Amplifier's written reviews are positive against 100% of Scrap Science's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on September 23, 2026 and June 11, 2026 respectively.

## The numbers

| Metric | Sound Amplifier | Scrap Science |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (1.2K ratings)](https://appshunter.io/ios/app/sound-amplifier/id1615079093/reviews)** | [4.3 (3 ratings)](https://appshunter.io/ios/app/scrap-science/id6648758210/reviews) |
| Number of ratings | **1.2K** | 3 |
| Positive reviews | 34.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 23 MB | 71 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | +4 | 4+ |
| Developer | [Mighty Fine Apps LLC](https://appshunter.io/developer/973529494) | [TY International LLC](https://appshunter.io/developer/1576465822) |

## What reviewers say

### Sound Amplifier

[App page](https://appshunter.io/ios/app/sound-amplifier/id1615079093)

Transform your phone into a powerful hearing aid. This app amplifies sound up to 100x, enhances voice clarity, and reduces background noise. Protect your hearing while easily listening to conversations, lectures, or TV with connected headphones.

**Highlights:** Volume amplification up to 100x, Voice isolation for clearer conversations, Hearing protection features, Background app operation, Simple one-tap amplification, Bluetooth headphone support

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $9.99 | per month |
| Full Access | $49.99 | per year |
| Full Access | $59.99 | per year |
| Full Access | $99.99 | per year |

**What reviewers like**

- ⭐ Excellent sound quality
- 🔊 Effective amplification
- 🎧 Works well with wireless headphones

**What reviewers complain about**

- 💰 Expensive subscription model
- 🔒 Locked behind paywall
- 🔁 Delayed audio playback
- 🚫 Doesn't work with built-in phone speakers

**Reported bugs**

- Subscription charges even after cancellation
- Inability to cancel free trial
- Compatibility issues with certain devices

**Requested features**

- Free trial option without payment info
- Ability to use without subscription
- Integration with iOS accessibility features


### Scrap Science

[App page](https://appshunter.io/ios/app/scrap-science/id6648758210)

This AI-powered app helps U.S. scrap recycling professionals identify scrap categories, assess material content, and impurity levels. It provides real-time pricing for identified materials, enabling profitable decisions on the spot. Streamline your workflow with this fast, easy, and reliable tool.

**Highlights:** AI-powered scrap identification, Material content assessment, Impurity level analysis, Real-time pricing, Workflow streamlining, Patent-authorized innovation

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly auto-subscription | $9.99 | per month |
| Enterprise Package 1 | $79.99 | per month |
| Enterprise Package 2 | $148.99 | per month |
| Enterprise Package 3 | $209.00 | per month |
| Enterprise Package 4 | $590.00 | per month |
| Try it out | $0.99 | one-time |


## Frequently asked questions

### Is Sound Amplifier free?

Sound Amplifier is free to download, with in-app purchases available.

### Is Scrap Science free?

Scrap Science is free to download, with in-app purchases available.

### Which has better reviews, Sound Amplifier or Scrap Science?

Sound Amplifier is rated higher. Sound Amplifier averages 4.6 out of 5 from 1.2K ratings, while Scrap Science averages 4.3 from 3 ratings.

### Do Sound Amplifier or Scrap Science have ads?

Neither Sound Amplifier nor Scrap Science shows ads.

### Which is updated more often, Sound Amplifier or Scrap Science?

Sound Amplifier ships an update every 2 weeks, and Scrap Science every 2 weeks. Most recently, Sound Amplifier was updated on September 23, 2026 and Scrap Science on June 11, 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.*