KnowItAll AI Chat is an iPhone app that gives access to several major AI models, Claude, ChatGPT, Gemini and Grok, from a single chat and writing interface rather than switching between separate provider apps. It is developed by Andrew Lee Ventures LLC and listed on the App Store as “AI Chatbot & Writer: KnowIt”, where it holds a 4.7 out of 5 rating from more than 1,500 ratings and was last updated in December 2025. The app’s own marketing site is a single page with a download link and a contact option, with no separate feature or pricing breakdown published outside the App Store listing itself.
KnowItAll is a third-party wrapper around other companies’ AI models, not an official app from Anthropic, OpenAI, Google or xAI, so model access, pricing and available features depend on what the developer has built and licensed rather than on each provider’s own app or website. A user who wants direct account controls, the latest model versions immediately on release, or a provider’s own privacy terms should compare this against using each company’s own official app.
The app is free to download from the App Store; any subscription or in-app purchase for extended usage or premium model access is set through Apple’s own listing rather than published on the marketing site.
