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Can a phone app ease PTSD? large study puts it to the test.

NCT ID NCT04888169

Symptom relief Sponsor: University of California, San Francisco 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
Running, but no longer taking on new participants.
Completed This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 25, 2026 · Last updated Jul 24, 2026 · Updated 3 times

Summary

This study tested whether a smartphone app that retrains attention can help people with post-traumatic stress disorder (PTSD). Over 1,300 adults with PTSD symptoms used one of four app versions for two weeks. Researchers measured changes in PTSD symptoms right after training and again eight weeks later. The goal was to see if attention bias modification could be a simple, remote treatment option.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Attention bias modification via smartphone app
What this could lead to
If it works, this could offer a convenient, app-based way to reduce PTSD symptoms without medication or in-person therapy.
What could go wrong
This is an early-stage study testing different training approaches, so it may not show clear benefits. The effect may be small or not last long-term.

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.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

1,314 people

The number who actually took part.

Started

Apr 2023

Finished

Jun 2025

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

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

Ages

18 to 65 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

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: * Aged 18 to 65 years * Score at or above 33 on the PCL-5, * Able and willing to perform daily smartphone training for two weeks * Fluent English comprehension. * Owns Android or iPhone smartphone Exclusion Criteria: * Does not have Android or iPhone Operating System (iOS) smartphone running sufficient software (i.e. at least iOS 10.1), and is not willing to update * Active suicidality.

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Conditions

The condition(s) this trial relates to.

post-traumatic stress disorder

As listed by the trial registrant

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

Post-traumatic stress disorder

Contacts and locations

Locations

  • Tommy Atwater

    San Francisco, California, 94143, United States

More trials for these conditions

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