Cochlear Synaptopathy (CS) is the first sign of permanent hearing damage, caused by ageing, excessive exposure to noise or ototoxicity. It affects predominantly communication in background noise and despite its huge prevalence among hearing impaired people, there is currently neither clinical diagnosis nor treatment available. The EU-funded EarDiTech project will further develop the CochSyn test, a differential test based on auditory EEG signals, for the precision diagnosis of CS. At the same time, the project will optimize the CoNNear algorithms for the use in hearing devices, which, based on the outcomes of the CochSyn test, can individually compensate for CS. In addition, clinical trials will provide evidence of the patient benefit and the applicability in a real-world clinical context.