# R128x Loudness Measuring Tool — Supports batch measuring.

> Supports batch measuring. (iPhone/iPad app by 立剑 孙.)

- Source: https://appshunter.io/ios/app/r128x-loudness-measuring-tool/id6504094713 (this page in markdown: same URL + `.md`)
- Developer: [立剑 孙](https://appshunter.io/developer/1647135461)
- Category: Music, Utilities
- Price: $9.99
- Age rating: 4+
- Requires: iOS 17.0 · 3 MB
- Languages: American English, French (France), German (Germany), Japanese, Brazilian Portuguese, Russian, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan), Turkish
- Released: 2024-06-10
- Data updated: 2026-02-23
- User reviews in markdown: https://appshunter.io/ios/app/r128x-loudness-measuring-tool/id6504094713/reviews.md

## What is R128x Loudness Measuring Tool?

r128x is a utility app for batch-measuring loudness of audio files which formats are supported* by the current version of the CoreAudio framework shipped in macOS and iOS.

This is a useful utility in audio production industry. Some scenarios for example:
- If you are a MIDI composer asking for someone else to help you mix the tracks, you need to make sure the loudness and the max dB-to-top of all tracks are in the safe range.
- Mastering engineers can use this tool to see whether an album shares the same loudness range among all of its tracks.
- Especially, this app allows you to immediately audition the 3-second part around the first dBTP location by tapping / clicking a measured track. You may also use the up / down arrow key on your keyboard to navigate among measured tracks and hit the space key to do the same audition action.

P.S.: The supported formats include MOV, MP4, MP3, MP2, M4A (iTunes Plus), WAV, AIF, OGG, AIFF, CAF, ALAC, SD2, AC3, FLAC.

The App Store version of this app charge fees as a compensation to the cost of the Apple Developer Program fee. Individuals who disagree with this can use Xcode to build the app by themselves using the code repository of this app (released for free under GPLv3 license): https://github.com/ShikiSuen/r128x

Following 3rd-party open-source components are used in this app:
https://github.com/jiixyj/libebur128

P.S.: The Japanese and Chinese titles of the app are "百二十八禁", but this is an all-ages app.


## Version history (last 1 release)

### 0.9.0 — 2025-09-16

No release notes.

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## More apps by 立剑 孙

- [The Latte Helper](https://appshunter.io/ios/app/the-latte-helper/id6757201427)

All apps by 立剑 孙: https://appshunter.io/developer/1647135461

## Related topics

[r128x loudness measuring tool](https://appshunter.io/ios/topics/r128x-loudness-measuring-tool)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-02-23.*