AudioKit Synth One - Free & Open-source iPhone/iPad Synth 🎹
ReSlice - Slice your audio with an advanced, rhythmic arpeggiator and FX.
Sampulator - Make (and record) beats on your keyboard
Auxy Music Studio - Auxy brings real music creation to iPhone in a simple and inspiring format.
Logic Pro X - Music production.
nlog Synth - Professional Virtual Analogue Synthesizer ::: check nlogmusic at YouTube :::