Question: Can you recommend a service that offers a chatbot tutor to answer questions on uploaded materials?

First up is Kipper, an AI-powered academic assistant that could be useful. It's got a chatbot tutor that'll answer questions based on documents you upload, but also other tools like an essay writer, summarizer and text booster. The service is geared to help you get your work done faster, and it's got a monthly subscription plan at $0.99 per day.

Another option is Mindgrasp, which uses AI to help you learn more effectively. It can generate notes, summaries, flashcards and quizzes based on a variety of sources, including documents and PDFs. Mindgrasp offers a variety of pricing tiers, so it's a good option for students and professionals who want to improve learning.

If you want a more personalized learning experience, AI Tutor offers a variety of AI personalities and models, including customized learning paths and immediate help for hard subjects. It can handle multiple languages and offers voice-controlled learning, too, so it's a good general-purpose learning support service.