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300,000 iPhone users join Apple's landmark hearing study

NCT ID NCT04172766

Knowledge-focused Sponsor: Apple Inc. Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing This study
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study, run by Apple and the University of Michigan, tracks headphone and environmental sound exposure in 300,000 US adults using iPhones and Apple Watches. Participants answer surveys and take hearing tests through the Research app. The goal is to understand how everyday sounds affect hearing over time and to guide public health policies.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 300,000 people

The number the study aims to enrol. It can still change while the study runs.

Started

Nov 2019

Expected to finish

Dec 2029

An estimate. End dates often move.

Lead sponsor

A company

The lead sponsor is a pharmaceutical, biotech, or medical-device company.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Adults age 18 or older that live in the U.S. or U.S. territories and have iPhone with the Research app installed.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Age ≥ 18 years at time of eligibility screening, ascertained from self-reported date of birth. Potential subjects in the states of Alabama and Nebraska must be 19 or older (legal age of consent in these states), and 21 and older for any subjects in Puerto Rico. * Live in the United States of America at time of eligibility screening, ascertained from self-report. * Proficient in written and spoken English, defined by self-report. * Participants must NOT share their iCloud account, iPhone or other devices such as Apple Watch with anyone else as this would make it challenging for researchers to use their information. * Possession of the following, ascertained from automatic hardware/software/device pairing check: * iPhone with iOS versions capable of supporting the Research app used to complete screening eligibility. * Optional: Apple Watch (any model) paired with iPhone; an Apple Watch Series 4 or later is required to share environmental sound levels.

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Conditions

The condition(s) this trial relates to.

hearing loss disorder noise induced hearing loss tinnitus

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Hearing loss Hearing loss, noise-induced Tinnitus

Contacts and locations

Locations

  • University of Michigan School of Public Health

    Ann Arbor, Michigan, 48109, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.