Best Chatbot App as Tech Advisor for Hard-Core iDevice Questions - iTechGuy

After ChatGPT came out, there are lots of chatbot apps powered by LLM (large language model). However, so far only one chatbot app is specialized on answering tech questions as a personal consultant. It’s name is iTechGuy. It can answer many hard-core questions. It also provides answer from ChatGPT as a comparison. I tried asking about some very difficult knowledges about Mac Pro and mostly it has better answers than ChatGPT. It’s free of use for a certain number of questions and you can pay once for unlimited usage.