I’m not sure if there is an IOS app for it but I use bodbot. It will give you a workout based on what you are wanting out of it. So if you are wanting to build muscle mass it’ll organize routines based off that goal. I will say though that it’s been a long while since I’ve utilized the free version. I paid for lifetime access some years back. Certain features were behind a pay wall that I wanted access too and I justified paying the rather hefty one time fee for it. You may not need those features so it may not be a big deal to you. Here check out their workout generator and see if this is what you are wanting.
I’m not sure if there is an IOS app for it but I use bodbot. It will give you a workout based on what you are wanting out of it. So if you are wanting to build muscle mass it’ll organize routines based off that goal. I will say though that it’s been a long while since I’ve utilized the free version. I paid for lifetime access some years back. Certain features were behind a pay wall that I wanted access too and I justified paying the rather hefty one time fee for it. You may not need those features so it may not be a big deal to you. Here check out their workout generator and see if this is what you are wanting.