Rode Microphones has announced another iOS Product called the smartLav. The smartLav uses a TRRS connection to plug directly into any iOS device and uses an Omni-directional capsule picking up sound equally around the lav microphone. The smartLav will work with other recording apps, but is perfectly paired to be used with the new Rode Rec App which includes a wide range of equalization presets to suit various recording situations. The smartLav should retail around $60 bucks. For more information check out the dedicated website at https://smartlav.com.
Rode smartLAV Lavalier Microphone for iOS