# SUS4 Mix Check — A/B your mix to a reference.

> A/B your mix to a reference. (iPhone/iPad app by ThePaulSmith.)

- Source: https://appshunter.io/ios/app/sus4-mix-check/id6777229916 (this page in markdown: same URL + `.md`)
- Developer: [ThePaulSmith](https://appshunter.io/developer/319584506)
- Category: Music, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.0 · 19 MB
- Languages: American English
- Released: 2026-06-16
- Data updated: 2026-07-19
- User reviews in markdown: https://appshunter.io/ios/app/sus4-mix-check/id6777229916/reviews.md

## What is SUS4 Mix Check?

Does your mix translate? Find out.

You have been in the session for four hours and you have lost perspective. SUS4 Mix Check gives you an objective read: A/B your mix against a professional reference track, check integrated LUFS against streaming platform targets, and see the frequency spectrum of both tracks overlaid so gaps and buildups are visible immediately.

The plain-English report translates the technical data into actionable language — not a raw frequency chart that requires interpretation, but a clear note that says what needs attention and where. Useful for the final check before you send a mix to a client, and useful mid-session when you need a reset.

• A/B comparison: your mix against any reference track
• Integrated LUFS measurement against streaming platform targets
• Spectrum overlay: your mix and the reference on the same display
• Plain-English report — specific, actionable, no jargon required
• Genre reference presets for common target levels
• Unlock once: unlimited analyses, genre references, spectrum history, and full reports

All analysis runs on-device. No audio is ever uploaded.

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| SUS4 Mix Check Pro Monthly | $0.99 | per month |
| SUS4 All-Access | $4.99 | per month |



## Version history (last 3 releases)

### 1.1.0 — 2026-07-02

Every advertised feature is now fully functional, Pro genuinely unlocks real features, and the new SUS4 All-Access pass unlocks all 24 SUS4 apps with a 7-day free trial. Faster and clearer throughout.

### 1.0.2 — 2026-06-22

Reliability and performance improvements throughout the app.

### 1.0 — 2026-06-16

No release notes.

## More apps by ThePaulSmith

- [iScrobble Pick And Mix](https://appshunter.io/ios/app/iscrobble-pick-and-mix/id319584503)
- [iSwipeMusic](https://appshunter.io/ios/app/iswipemusic/id334689181)
- [iShuffleAlbums](https://appshunter.io/ios/app/ishufflealbums/id335009718)
- [iBreathalyzer](https://appshunter.io/ios/app/ibreathalyzer/id369686249)
- [SUS4 Pitch Pipe](https://appshunter.io/ios/app/sus4-pitch-pipe/id6777229584)
- [SUS4 Chord ID](https://appshunter.io/ios/app/sus4-chord-id/id6777229621)

All apps by ThePaulSmith: https://appshunter.io/developer/319584506

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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 2026-07-19.*