This app is designed to assist with the screening of patients who present with a unilateral sudden hearing loss. The app should be used by a trained clinician.A review of the evidence for the assessment and management of sudden sensorineural hearing loss can be found in Chandrasekhar et al. 2019:https://pubmed.ncbi.nlm.nih.gov/31369359/A review of the diagnostic accuracy of tuning fork tests for hearing loss can be found in Kelly et al. 2018:https://pubmed.ncbi.nlm.nih.gov/29661046/NICE guidance for sudden sensorineural hearing loss can be found here:https://www.nice.org.uk/guidance/qs185/chapter/quality-statement-2-sudden-onset-of-hearing-loss