XX.AI is described as 'Offers a simple and cost-effective solution for unlimited access to GPT-4, Claude 3, and DALL-E 3. With essential shortcuts like Shift + A for instant activation, you can harness the power of AI in any writing or content creation task' and is an app in the development category. There are more than 25 alternatives to XX.AI for a variety of platforms, including Mac, Windows, Linux, iPhone and iPad apps. The best XX.AI alternative is Jan.ai, which is both free and Open Source. Other great apps like XX.AI are GPT4ALL, AnythingLLM, LM Studio and Khoj.