You cannot natively clone most apps on iPhone
Use the app’s built-in account switch or multi-profile feature if available
Install a separate app version from the App Store if the developer provides one
Use TestFlight if the developer offers a beta version
Use a second Apple ID and separate app data where supported
Use iOS Focus modes to separate app usage contexts
Use Shortcuts to automate opening different accounts or workflows
Use third-party cloning tools only if you fully trust them and understand the risks
Use a second device if you need a true separate copy of the same app
Use web versions of the app in Safari for an additional session
Check whether the app supports Family Sharing or multiple profiles