VST/AU developer iZotope, Inc. remembered that they had an iOS app Spire: Multitrack Music Recorder, which had been forgotten since its launch in 2015. Their plans, and investment, in the platform have escalated quickly with the announcement of a hardware Spire Studio. This $350 2-input audio interface is truly unlike anything we've seen before.
The battery powered Spire Studio includes a WiFi component that lets you transfer recordings directly to their iOS app. There's even an on-board mic that can "sound check" your room to give you the best possible recording. The app was updated today to make use of the new hardware, but I can't find any details on when it will be available for purchase.
What's new in Spire: Multitrack Music Recorder v2.0.0:• Support for Spire Studio mobile recording hardware
• Creative effects and guitar amp models (with Spire Studio connection)
• Individual track colors for intuitive identification and mixing
• Precision editing to edit your recordings perfectly
• In-app help guide / tour
• Various bug fixes and user interface improvements