Note: requires iOS 14. I would have liked to give it a try, and pay if it proves superior to Apple's "Music Memos", but I can't, as I run an iPhone 6 / iOS 12 that is still very functional and security-patched by Apple (iOS 12.5.5 shipped last week). As a developer, I can for sure understand you're limiting to the "latest and greatest" for API usage simplicity, but I urge you to reconsider requiring iOS 14. Two argum…
We need at least iOS 14 for the stereo recording functionality. Even then, not all devices that support iOS 14 also support stereo recording, and we don't even offer the in-app purchase option on those devices that don't support it.
We also make heavy use of CoreML, for which we require at least iOS 13. So in theory, we could go one version lower, but since all devices that support iOS 13 also support 14 and 15, we will likely increase the minimum version to iOS 15 once it has reached significant adoption, because of the improvements to CoreML iOS 15 ships with.
I know it's not the answer you wanted. I hope you understand that this choice wasn't made out of ignorance, but simply due to hard technical limitations.