# MP3Gain vs K

The clearest difference is review sentiment: K at 100% against MP3Gain's 14%. K also leads on update cadence (every 4 days vs weekly). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. MP3Gain sells 6 in-app purchases, starting at $1.99 per month and K sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

MP3Gain ships an update weekly, K every 4 days. The most recent releases landed on October 15, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | MP3Gain | K |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 13.8% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 4 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 18 MB | 2 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [SEASOFT LTD.](https://appshunter.io/developer/456906339) | [Asoft.iOS](https://appshunter.io/developer/562152712) |

## What reviewers say

### MP3Gain

[App page](https://appshunter.io/ios/app/mp3gain-audio-normalization/id697885500)

This app normalizes the volume of your audio files, ensuring consistent loudness across songs, podcasts, and uploads. It offers multiple analysis modes and presets for easy use, with batch processing for multiple files. Listen to comparisons before exporting to maintain audio quality and metadata.

**Highlights:** Volume normalization, Multiple analysis modes (Peak, RMS, EBU R128), Built-in and custom presets, Batch processing, Listen before export, Preserves metadata and album art, Supports MP3, FLAC, M4A, WAV, AIFF, OGG

**Features:** Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MP3Gain Premium Monthly Plan | $1.99 | per month |
| MP3Gain Pro(Yearly) | $9.99 | per year |
| WMA Gain | $6.99 | one-time |
| MP3, M4A Gain | $6.99 | one-time |
| Gain all audio format | $9.99 | one-time |
| MP3Gain Pro (Lifetime) | $19.99 | one-time |


### K

[App page](https://appshunter.io/ios/app/k-tuner/id6811544285)

This application provides hands-free audio feedback for tuning musical instruments. It audibly announces the string and its tuning status, making it accessible for visually impaired users and convenient for all. Advanced features and additional tunings are available through a one-time purchase.

**Highlights:** Hands-free audio tuning, Spoken results for string and pitch, VoiceOver integration, Automatic string detection, Capo support, Visual meter for sighted users, Multiple alternative tunings (Pro)

**Features:** Family Sharing, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| A coffee | $1.99 | one-time |
| A set of strings | $5.99 | one-time |
| KTuner Pro | $6.99 | one-time |
| A big thank-you | $19.99 | one-time |


## Frequently asked questions

### Is MP3Gain free?

MP3Gain is free to download, with in-app purchases available.

### Is K free?

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

### Do MP3Gain or K have ads?

Neither MP3Gain nor K shows ads.

### Which is updated more often, MP3Gain or K?

MP3Gain ships an update weekly, and K every 4 days. Most recently, MP3Gain was updated on October 15, 2026 and K on October 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.*