# Sound Amplifier | Volume Boost vs GKF Studio

The clearest difference is rating: GKF Studio at 5.0 against Sound Amplifier | Volume Boost's 4.5. GKF Studio also leads on in-app purchases (none vs 5) and review sentiment (100% vs 84%). Sound Amplifier | Volume Boost's advantage is update cadence (every 4 months vs every 44 months) and ratings volume (2.3K vs 3). On price, ads and device support there is nothing between them.

Both are free to download. Sound Amplifier | Volume Boost sells 5 in-app purchases, starting at $5.99 per 7 days. GKF Studio asks for nothing beyond the download.

GKF Studio holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Sound Amplifier | Volume Boost has 2.3K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 84% of Sound Amplifier | Volume Boost's written reviews are positive against 100% of GKF Studio's.

Sound Amplifier | Volume Boost ships an update every 4 months, GKF Studio every 44 months. The most recent releases landed on October 22, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Sound Amplifier | Volume Boost | GKF Studio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (2.3K ratings)](https://appshunter.io/ios/app/sound-amplifier-volume-boost/id1470850192/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/gkf-studio/id1537596785/reviews)** |
| Number of ratings | **2.3K** | 3 |
| Positive reviews | 84.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 44 months |
| Monetization | Freemium | **Free** |
| Size | 34 MB | 68 MB |
| Requires iOS | 14.0 | **11.0.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Irakli Tsuladze](https://appshunter.io/developer/1731800085) | [Get Kristen Fit LLC](https://appshunter.io/developer/1537597147) |

## What reviewers say

### Sound Amplifier | Volume Boost

[App page](https://appshunter.io/ios/app/sound-amplifier-volume-boost/id1470850192)

Amplify live headphone audio and enhance your listening experience. This app offers volume boosts, music enhancement, and even a hearing assessment. Record audio and review transcriptions to never miss a word.

**Highlights:** Volume boost presets, Music enhancement, Hearing assessment, Live audio recording, Real-time transcriptions, Personalized hearing profiles, Noise reduction

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Access | $5.99 | per 7 days |
| Hearing Amplifier, Ear Spy | $11.99 | per month |
| 3-Month Sound Boost Access | $12.99 | per 3 months |
| Listening Device, Amp Me | $39.99 | per year |
| lifetime | $44.99 | one-time |

**What reviewers like**

- 👍 Clear audio quality
- 🚀 Effective sound amplification
- 💡 Useful hearing profile test
- 🔒 Secure and private
- 👍 Easy to use interface

**What reviewers complain about**

- 🔒 Requires subscription for full access
- 🐛 Occasional bugs and glitches
- 🔋 High battery consumption
- 🔒 Forced to leave review for access

**Reported bugs**

- Recording feature not working
- Delayed sound output
- Compatibility issues with older devices

**Requested features**

- Compatibility with more audio sources
- Background playback support
- Customizable sound profiles
- Volume boost for specific apps


### GKF Studio

[App page](https://appshunter.io/ios/app/gkf-studio/id1537596785)

Book fitness sessions and view class schedules directly through the app. Stay updated on class times and reserve your spot easily. Manage your fitness journey conveniently.

**Highlights:** View class schedules, Book fitness sessions, Manage bookings, Stay updated on class times, Easy session reservation

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sound Amplifier | Volume Boost free?

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

### Is GKF Studio free?

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

### Which has better reviews, Sound Amplifier | Volume Boost or GKF Studio?

GKF Studio is rated higher. Sound Amplifier | Volume Boost averages 4.5 out of 5 from 2.3K ratings, while GKF Studio averages 5.0 from 3 ratings.

### Do Sound Amplifier | Volume Boost or GKF Studio have ads?

Neither Sound Amplifier | Volume Boost nor GKF Studio shows ads.

### Which is updated more often, Sound Amplifier | Volume Boost or GKF Studio?

Sound Amplifier | Volume Boost ships an update every 4 months, and GKF Studio every 44 months. Most recently, Sound Amplifier | Volume Boost was updated on October 22, 2026 and GKF Studio on October 16, 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.*