Question: Can you recommend a mobile app that can scan and analyze chess diagrams from prints and digital documents?

If you want a full-featured mobile app that can scan and analyze chess diagrams in printouts and digital documents, Chessvision is a great option. The app can scan chess diagrams from printouts and digital documents, identify positions and display them on an analysis board. It also offers features like real-time analysis, automatic matching with YouTube videos and the ability to export exercises to Lichess Study or PDF sheets. Chessvision also offers subscription plans for access to other features, so it's a good option for chess players who want a versatile tool.

Another good option is Noctie.ai, which serves as a personal AI chess coach. It doesn't directly scan diagrams, but it offers real-time analysis of your moves, immediate feedback and personalized training exercises to help you improve your chess. It adapts its style to your skill level and includes custom tactics and training exercises, so it's a good option for improving your chess skills.

If you're looking for a more strategic approach, Knightly Chess offers detailed move analysis and strategic advice for improvement. It's mostly an online service, but it can analyze recent games to try to find areas of improvement, and it offers subscriptions for more detailed analysis. It integrates with Chess.com and soon will with Lichess, so you can import games and get detailed reports. It's good for people who want to improve their chess skills over time.