Inclusion Criteria:  Men or Women ≥ 18 years of age coming for consultation at the implementation centre. Subjects who can read and write French. Patients who are candidates for cochlear implantation and who have not had any contraindication to the operation following the pre-implant assessment. Ability to sign free and informed consent. Subjects with a smartphone or laptop that allows access to the application  Exclusion Criteria:  - Physical and cultural factors that may interfere with testing.