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I will have to bump the minimum iOS version in the next update 3.7 to at least iOS13 as this is the requirement for iCloud sync which will be the big feature in version 3.7.
Any device that is compatible with iOS13 can also be updated to iOS15. So now I'm thinking of bumping the requirement directly to iOS15 as the minimum version.
Is here anyone who is running iOS13 or 14 and has not updated to version 15? And if yes, why do you stick with the old version even though you could update?
The oldest devices capable of running iOS13-iOS15 are from 2014/2015 (iPad mini 4, iPad Air 2, iPhone 6S). So any device younger than 7 years should be fine.