Background: The use of mobile health (mHealth) technology is rapidly expanding in healthcare worldwide. mHealth tools may provide parents with access to resources essential for promoting language development. Aim: The current study aimed to determine how an mHealth parental resource influenced 42 preschool children's (4.0-5.11 months old) language abilities after a 17-week intervention period. Setting: Participants were identified from six early childhood development (ECD) centres from a low-income community in Tshwane, South Africa. Method: A randomised controlled trial (RCT), pre-test post-test research design was employed to determine whether an mHealth parental resource influenced 42 preschool children's (4.0-5.11 months old) language abilities after a 17-week intervention period. Data were collected using the language subtests of a South African standardised protocol, the Emergent Literacy and Language Assessment Protocol (ELLA). Results: The parental mHealth application targeting language stimulation did not significantly improve the experimental group's language outcomes when compared with the control group because most of the parents (n = 27) used the application for less than 20% of the active days. Conclusion: Providing parents with more support with mobile resources may lead to improved usage of the application.