TalkinBrain is a customized ChatGPT app that offers an enhanced and personalized conversation experience. Its features include Prompt Gallery, customizable prompts, multitasking tabs, and bookmarking and spotlight search. Users require an OpenAI API Key, and a one-time purchase fee of $14.90 USD is charged for lifetime access to all features. While user experience is its main focus, the app is built on OpenAI's ChatGPT API and needs a functioning API Key and payment for the tokens used when applying the API Key. TalkinBrain offers a joyful and efficient chatting experience for ChatGPT users.