Inclusion Criteria:  Mild-to-moderate bilateral sensorineural hearing loss (thresholds from 250 - 8000 Hz less than 60 dB HL and from 2000 - 8000 Hz, at least one threshold greater than 20 dB HL) Mix of male and female subjects (aiming for a representative balance) Mix of prior hearing-aid use (aiming for 70-80% persons with no prior hearing aid use) 18-75 years old (aiming for primarily 50-70 years old, with avg. age ~65 years) Apple iPhone (iOS 14 compatible or greater, as required for the SELF-FIT app) Able to read and comprehend English Patient willing to provide informed consent  Exclusion Criteria:  Hearing outside of limits noted above Self-reported ear-related pathology (including chronic severe dizziness or chronic severe tinnitus)