The best alternatives to GymKing for iOS are Hevy, Onelink.to, and Gym Diary. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hevy is a free gym workout tracker & planner app for iOS and Android. Plan your weight lifting routines, track your progress, and join a growing community.
Onelink.to is a short-link generator for app downloads.
With onelink.to you get one short-link or QR code to your app no matter if it's on Apple AppStore, Google Play, or any other app store. Instead of printing several QR codes or having several separate links to each app store, you only need one short link or QR code.