mifki Limited released miRack, a port of VCV Rack v0.6 to iOS! VCV Rack is a virtual Eurorack modular synth, and has been extremely popular on desktops. The new iOS port arrives with a ton of modules. It supports CoreMIDI and background audio, but does not support any inter-app protocol. They are aware that this is a feature many users are demanding.
miRack App Store Description:miRack is a Eurorack-style modular synthesizer. It aims to provide user experience and audio quality close to those of the real Eurorack hardware.
miRack is based on VCV Rack by Andrew Belt, and started in 2018 as a fork optimized for single-board computers (e.g. Raspberry Pi), touch-based devices and web. Now it's available on iOS.
The app comes with a growing collection of open-source modules that are being created by third-party developers for VCV Rack and adapted for mobile devices by miRack team.
Supports Core MIDI input and background audio mode.
Newer devices are recommended for better performance. Modules may vary greatly in CPU usage, the size of the patch your device is able run will depend on the modules used.