A large-scale, cluster-randomized controlled field trial (N[subscript classrooms] = 47; N[subscript students] = 1,013) assessed the impact of a digital text-to-speech reading material that supported 8-year-olds' decoding and reading comprehension. An active control group used the most prevalent Danish learning material with a research-based systematic, explicit phonics approach supporting primarily decoding. The digital tool allows children to read unfamiliar text for meaning. Students are supported in mapping between orthography and phonology by three levels of text-to-speech support and in identifying spelling patterns. The risk of students overusing text-to-speech was countered by postponing access to having words read aloud by directing students towards identifying and training relevant orthographic patterns before activating text-to-speech. Results showed no statistically significant difference in decoding, but treatment improved reading comprehension. The study demonstrates how digital tools can facilitate strengthening students' decoding skills as efficiently as a traditional phonics-based programme while students are reading text of relatively high orthographic complexity for meaning.