yes and no! the thing is from a dev perspective u can install apps from outside the AppStore (.ipa iOS app archive) using a Mac for 7 days or permanently using a dev license similar to android.
But normal users will need to jailbreak there iPhones to do that which stopes updates, increase risk and vulnerabilities if they’re not careful what they’re installing.
The only hope is Alternative Stores which do similar job by auto-refreshing the install of the .ipa file every 7 days, and need to be installed on iPhones via a PC/Mac using the giving installer from the AltStore website.