Beepstreet has again something in the works for iOS...

[Cinebient]

modular drum + sequencer:
AUv3, iPad + iPhone
Simplified (but smart modular architecture - no cables.
Audio rate modulation, optional oversampling
Modules: samplers, generators (like 808 circuit model), oscillators, modulators, envelopes, filters, effects and modules that operate on triggers (all zips zaps, fills etc..)
File access via iCloud (one folder on mac and iOs)
Stereo processing
Parameter locks
It seems in alpha yet.

[Gasler]

AUTO-ADMIN: Non-MP3, WAV, OGG, SoundCloud, YouTube, Vimeo, Twitter and Facebook links in this post have been protected automatically. Once the member reaches 5 posts the links will function as normal.

modular drum + sequencer:
AUv3, iPad + iPhone
Simplified (but smart modular architecture - no cables.
Audio rate modulation, optional oversampling
Modules: samplers, generators (like 808 circuit model), oscillators, modulators, envelopes, filters, effects and modules that operate on triggers (all zips zaps, fills etc..)
File access via iCloud (one folder on mac and iOs)
Stereo processing
Parameter locks
It seems in alpha yet.

Sure , It's very powerful, as well as it can support use to switch (http://www.iphonetransferrecovery.com/tutorials/transfer-contacts-from-iphone-to-android.html) iPhone to another devices .