eXtream Software Development has added Vocal Time Studio, a vocal pitch and time correction editor to their Android and iOS DAW, Audio Evolution Mobile Studio. Here's what they say:
With this new and unique feature on mobile, pitch and time in vocal recordings can be edited in high detail. A piano-roll like view displays audio with the same pitch as separate notes, which can then be adjusted up and down for pitch correction or modification. The retune time, retune amount, volume and amount of formant correction can be set globally or for each individual note. When needed, artificial vibrato can also be applied to each note with parameters for vibrato depth, rate and settings to adjust the time when the vibrato kicks in and the time in which it reaches the full vibrato depth to obtain a natural sounding vibrato.
Individual notes or groups of notes can also be time corrected, adjusting phrases that are off-beat. Vocal Tune Studio can detect the key and scale of a vocal recording automatically or a key and scale can be manually chosen.
Aside from vocal pitch correction, Vocal Tune Studio also features a generic time correction/stretching mode which works on any type of audio material (not only vocals, but also guitars etc.). In this mode, any part of a recording that was played off-beat can be time corrected without affecting parts that were recorded in time.
Vocal Tune Studio has been fine-tuned to provide the highest quality compared to desktop offerings and is available now within Audio Evolution Mobile Studio on Android and iOS as an in-app purchase (around $25, country dependent).
Audio Evolution Mobile Studio (around $10) is an affordable multitrack audio and MIDI app with many features like real-time tempo and time signature changes, parallel effects routing, MIDI remote control, sidechain compression, Soundfont based instruments, a virtual analogue synthesizer 'Evolution One' based on AudioKit's Synth One, many free effects and premium Toneboosters effects and the Flowtones synth at discounted prices.