Mobile phone reminding apps can be used by people with acquired brain injury (ABI) to compensate for their memory impairments. However off-the-shelf apps may be difficult to use. ApplTree has been developed to be accessible to this group, compared to off-the-shelf reminding apps such as Google Calendar. This pilot feasibility trial aimed to establish the feasibility of running (and issues that should be addressed to complete) a randomised controlled trial comparing ApplTree to Google Calendar in an ABI community treatment setting.

Adults with self or other reported memory difficulty after an ABI were enrolled (n=39). Those who completed the baseline phase were randomised (n=29) and randomly allocated to the Google Calendar or ApplTree intervention. They were shown a 30 minute video tutorial of the app and an assessment on their ability to use it. Timely completion of everyday memory tasks were measured for a 3 week pre-intervention baseline and 3 week post-intervention follow-up phase. Participants also completed neuropsychological tests assessing memory, attention and executive function and gave qualitative feedback on the app and their experience in the trial.

Recruitment rate was 58% of the target (29 were randomised, n=50 was the target in 2 years). Retention rate was 65.5% and adherence rate was 57.9%. While the feasibility trial was not powered to calculate efficacy, there was a 13% increase in everyday memory tasks completed on time for those in the ApplTree group (n=10) compared to baseline and no change for the Google Calendar group (n=9). Feasibility results indicate 72 participants would need to fully complete a trial to detect the minimum clinically important difference (12.5% increase in successful performance of everyday memory tasks) in the efficacy of ApplTree compared to Google Calendar, should such a difference exist.

The challenges with recruitment of people receiving community care for ABI are highlighted in this trial and discussed along with the impact of the Covid-19 pandemic. Methodological considerations for researchers or clinicians looking to measure everyday memory ability are discussed. The majority (19 of 21) of participants who were given an app were capable of learning to use it during an hour-long session. This indicates it is a feasible intervention that community ABI services could offer. Participant feedback highlighted the merits of design features implemented in ApplTree that can improve the uptake and utility of reminding apps.