The CPR tutor is a tool that helps users learn and practice CPR skills using real-time feedback and multimodal data. It uses sensors to measure the kinematic and electromyographic data of the user while performing CPR on a manikin. The system uses recurrent neural networks to detect and classify chest compressions according to five performance indicators: compression rate, compression depth, compression release, hand position, and arm posture. The system then provides audio feedback to correct the most critical mistakes and improve CPR performance. The CPR tutor aims to enhance the learning experience and outcomes of CPR training by providing personalised and adaptive feedback based on multimodal data.