SUS4 Loop Builder
A loop at a time. A song.
Free · In‑App Purchases
Layer loops until the idea has a shape. Export stems when you're ready to produce.
Build a song one loop at a time.
SUS4 Loop Builder is a multi-track looper for building song ideas from scratch. Record a bass line into the first layer, layer a chord progression over it, add a melody on top, and keep going until the idea has a shape. Each layer has its own level and effect controls so the mix develops as you build.
When you have something, export the full mix or individual stems to your DAW for proper production. The loop library saves your builds so you can come back to them, reference them, or share a stem with a collaborator.
• Multi-track looping — record and layer on top of previous loops
• Per-layer level and effects controls
• Loop library for saving and revisiting ideas
• Stem export — export individual layers or the full mix
• Multi-track export to your DAW
• Subscribe monthly, or unlock the full SUS4 suite forever: unlimited loops, multi-track export, per-layer effects, and the full loop library
All recording stays on your device. No audio is uploaded.
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.
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.
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
- 20.1 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
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- SUS4 All-Access $4.99
- SUS4 Loop Builder Pro Monthly $0.99
- Copyright
- © 2026 4chords Studios