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BACKGROUND Mobile application-based therapies are increasingly being employed by speech-language pathologists in the rehabilitation of people with aphasia (PwA) as an adjunct or in lieu of traditional in-person therapy approaches. These apps can increase the intensity of treatment, and have been shown to result in meaningful outcomes across several domains OBJECTIVE VoiceAdapt is a mobile therapy app designed with user and stakeholder feedback within a user-centered design framework. VoiceAdapt uses two evidence-based lexical retrieval treatments to engage PwA to improve their naming abilities through interaction with the app. The purpose of the randomized controlled trial (RCT) proposed here is to examine the feasibility and clinical efficacy of training with VoiceAdapt on the language and communication outcomes of people with aphasia. METHODS A multicenter RCT is being conducted at two locations within Canada. A total of 80 people with aphasia will be recruited to participate in a two-arm, waitlist-controlled, crossover group RCT. After baseline assessment, participants will be randomized into an intervention group or a waitlist control group. Intervention group participants will engage in five weeks of training with the app, followed by post-treatment assessment and follow-up assessment after an additional five weeks. Those in the waitlist control group will have five weeks of no training, followed by a pre-treatment assessment, training for five weeks and post-treatment assessment. All aspects of the trial are being conducted remotely given the COVID-19 pandemic. RESULTS Recruitment of participants started in September 2020 and the study is expected to be completed by March 2022. Publication of results is expected within six months of study completion. CONCLUSIONS Results of the RCT will provide data to inform evidence-based practice on the use of technology-based solutions to treat aphasia. If positive results are obtained from this RCT, the VoiceAdapt app can be recommended as an efficacious means of improving lexical retrieval and communicative functioning in PwA within an easily accessible, cost-effective manner. Moreover, the implementation of this RCT through remote assessment and delivery can inform the profession on telerehabilitation practices and monitoring app-based home therapy programs. CLINICALTRIAL ClinicalTrials.gov NCT04108364; https://clinicaltrials.gov/ct2/show/NCT04108364