Chord ai is also available on Android for those interested, though I haven’t tried it myself.
Since I do much of my playing near my PC using Amplitube I don’t really need a mobile option, so I’m using Riffstation. No longer being developed but it’s free, and is pretty accurate with it’s chord detection most of the time. Other features are a display of the current and next chord, tempo/pitch/key shift, and a frequency isolator so you can cut out vocals/guitar/whatever. Works with most audio file formats.
Available on Windows, also appears to be available on iOS.