SUS4 Mix Check: Mix Analyzer
LUFS, true peak, reference
Free · In‑App Purchases
Measure LUFS, true peak and loudness range, set your mix next to a reference track and get a plain-English report on what to fix.
See whether your mix is too loud for streaming before you send it.
Measure LUFS, true peak and loudness range, compare the numbers with a reference track, and get a plain-English report.
Fully on-device: no cloud, no account.
Import a file or capture live input. Mix Check grades it against a streaming service's loudness target and a genre profile, then lists what is off: 2.2 LU too loud, true peak within the ceiling, the low end 1.2 dB darker than the reference.
• Integrated, short-term and momentary LUFS (BS.1770-4), true peak and loudness range
• Targets for the main streaming services and EBU R128
• Your mix next to a reference: loudness, dynamics, stereo correlation and frequency balance
• A plain-English report of what to change
• Session history: pin two versions of your mix and overlay their spectrum
For home-studio producers, mixing engineers and bands who master their releases at home. Mix Check measures; it does not play audio back.
Pro, or SUS4 All-Access across the whole range, removes the daily limit on analyses.
Made in the UK by working musicians.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
SUS4 now speaks your language: the app is available in 50 languages.
Any lifetime purchase now unlocks every SUS4 app.
A clearer upgrade screen, plus fixes and polish throughout.
The developer, ThePaulSmith, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Paul Smith
- Size
- 28.8 MB
- Category
- Music
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - iPad
Requires iPadOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 43 more
- English, Arabic, Bengali, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Gujarati, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Kannada, Korean, Malay, Malayalam, Marathi, Norwegian Bokmål, Oriya, Polish, Portuguese, Punjabi, Romanian, Russian, Simplified Chinese, Slovak, Slovenian, Spanish, Swedish, Tamil, Telugu, Thai, Traditional Chinese, Turkish, Ukrainian, Urdu, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- SUS4 Mix Check Lifetime $59.99
- SUS4 All-Access $4.99
- SUS4 Mix Check Pro Monthly $0.99
- Copyright
- © 2026 4chords Studios