# Audio Compressor vs Notekeepr by Upbooks

The clearest difference is in-app purchases: Notekeepr by Upbooks at none against Audio Compressor's 1. Notekeepr by Upbooks also leads on iOS requirement (13.4 vs 15.6). Audio Compressor's advantage is update cadence (weekly vs every 7 months). On price, ads and device support there is nothing between them.

Both are free to download. Audio Compressor sells 1 one-off in-app purchase. Notekeepr by Upbooks asks for nothing beyond the download.

Audio Compressor ships an update weekly, Notekeepr by Upbooks every 7 months. The most recent releases landed on October 21, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Audio Compressor | Notekeepr by Upbooks |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (256 ratings)](https://appshunter.io/ios/app/audio-compressor-mp3-shrink/id6449499993/reviews)** | — |
| Number of ratings | **256** | — |
| Positive reviews | 55.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 7 months |
| Monetization | Free with in-app purchases | — |
| Size | 19 MB | 24 MB |
| Requires iOS | 15.6 | **13.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Arthur Eduardo Skaetta Alvarez Desenvolvimento de Software LTDA.](https://appshunter.io/developer/867175889) | [Scrrum Labs Private Limited](https://appshunter.io/developer/1595543937) |

## What reviewers say

### Audio Compressor

[App page](https://appshunter.io/ios/app/audio-compressor-mp3-shrink/id6449499993)

Reduce audio file sizes without sacrificing sound quality. This app offers efficient compression, allowing you to reclaim storage space on your device. Easily compress audio from files or videos with offline processing.

**Highlights:** Efficient audio compression, Reduce file sizes without quality loss, Compress audio from files or videos, Fast and easy to use, Offline processing for privacy, Adjust bitrate and remove metadata

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Audio Compressor Premium | $0.99 | one-time |


### Notekeepr by Upbooks

[App page](https://appshunter.io/ios/app/notekeepr-by-upbooks/id6501962174)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Audio Compressor free?

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

### Is Notekeepr by Upbooks free?

Notekeepr by Upbooks is free to download, with no in-app purchases.

### Do Audio Compressor or Notekeepr by Upbooks have ads?

Neither Audio Compressor nor Notekeepr by Upbooks shows ads.

### Which is updated more often, Audio Compressor or Notekeepr by Upbooks?

Audio Compressor ships an update weekly, and Notekeepr by Upbooks every 7 months. Most recently, Audio Compressor was updated on October 21, 2026 and Notekeepr by Upbooks 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.*