This paper presents the results from a large-scale family-level randomized controlled trial evaluation of a texting program, TipsbyText, which had as its primary goal to enhance child language development through supporting parents and caregivers in creating playful, language stimulating activities. The program was delivered to parents of children aged 3-6 in Danish preschools and the evaluation combines the data from the randomized controlled trial with population-level register-based data. We measure outcomes immediately after program delivery and at one-year follow-up. While the program was generally well liked by parents and delivered as intended with relatively low dropout, TipsByText did not affect children’s language development, neither for the full sample, nor for any pre-defined subgroups. We discuss possible reasons for the lack of positive effects.