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, iPad and iPhone apps. The best XX.AI alternative is GPT4ALL, which is both free and Open Source. Other great apps like XX.AI are Jan.ai, AnythingLLM, LM Studio and Khoj.