Audulus 4 received its latest update on December 11, 2025, adding iPhone support — a significant expansion that makes the modular synthesis environment available on a broader range of devices. The app originally launched in December 2022.
Audulus 4 is a free modular synth app for iOS and Mac that offers a visual patching environment for building synthesizers, effects chains, and sequencers from scratch. Its intuitive node-based interface allows users to connect oscillators, filters, envelopes, and more in ways that mirror a hardware modular system, making it one of the most versatile tools in the iOS music production space.
Compatible with iPhone, iPad, and Mac as a universal app, Audulus 4 supports standalone mode and AUv3 plugin without a separate Mac purchase. The free version allows exploration of the patching environment, while the Patch Editing Upgrade ($19.99) unlocks full creation capabilities. Low latency and professional-grade performance make it suitable for live use as well as studio experimentation.
- Modular synth and effects builder with visual patching
- Nodes for oscillators, filters, envelopes, and more
- Professional-grade, low-latency performance
- Shape audio in real time — suitable for live use
- iPhone support added in latest update
- AUv3 plugin on iPhone, iPad, and Mac (no separate purchase needed)
App price: Free
In app purchases: Patch Editing Upgrade – $19.99
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