Just got back from working in Provo, UT this weekend, and driving up to SLC to see Chris Robinson Brotherhood twice. I test ed out the Shure MV-88, $144 from Amazon, which plugs into the lightening port. I had an extension lightning cable, and used my iPad because my eyesight's poor and the bigger screen was helpful. Had a first listen on home playback gear and was impressed. Not sounding like Shoeps->Foster FR-2, but nice sound for the price, which includes pretty cool software for controlling the mic, which is m/s, and recording. On my iPhonex, it used 4% of the battery to record 1:30 at 24/48, so no worries there. For fun, left it in my pocket at the airport, and it didn't set off the metal detector, which is nice to know as they're in use (Warfield) these days.
Anyway, need to listen more, but impressive for something so cheap and easy to stealth/use.
edited to fix typo