Based on my analysis of the provided information, the best AI chatbot or ChatGPT app for free in 2024 is Microsoft's Bing Chat. It is powered by ChatGPT and offers a similar experience to ChatGPT, but with the added benefit of being integrated with Microsoft's search engine. This means that users can access up-to-date information and perform traditional search engine functions, in addition to using the AI chatbot.
Bing Chat is also available for free, and users do not need to create an account to use it. It is accessible through the Bing website or through the Microsoft Edge browser. Additionally, Bing Chat offers a range of features and capabilities, including the ability to answer questions, provide information, and assist with tasks such as writing emails or creating documents.
Overall, Microsoft's Bing Chat is a strong option for those looking for a free AI chatbot or ChatGPT app in 2024. Its integration with Microsoft's search engine and its range of features make it a useful tool for a variety of tasks.