Which Apple app for ai has lifetime subscription

As of my last update in October 2023, one of the apps developed by Apple that incorporates AI features is "Siri," which is integrated into Apple's ecosystem. However, Siri itself does not have a subscription model since it is a built-in feature of Apple devices. If you are asking about third-party apps that utilize AI and offer a lifetime subscription, that may depend on the app's developer and their subscription model. Some AI-related apps do offer lifetime subscriptions, but they are not officially developed by Apple. For specific recommendations or updates, I would suggest checking the App Store or developer websites for the most current offerings and options related to AI apps.