The ChatGPT mobile app for iPhones has now been released (for users in the United States). Users previously had to use ChatGPT via their web browsers. This led to the proliferation of mobile apps that integrated GPT-3 being launched for the devices, including the Apple Watch (Like Petey, formerly called WatchGPT), as well as various other integrations. OpenAI says that an official Android app is also on its way.
This app is offered free of charge (pricing of products is always subject to change) and will sync your data history across all the devices you use ChatGPT on. The free app provides access to ChatGPT’s GPT-3 implementation. However, if you want access to ChatGPT Plus or the new GPT-4 implementation, you’d have to pay for a subscription.