**Citation** Apfelbaum, K. S., Goodwin, C., Blomquist, C., & McMurray, B. (submitted). The development of lexical competition in written- and spoken-word recognition. *Quarterly Journal of Experimental Psychology.* **Contents of OSF project** This OSF repository was created to serve as a permanent data repository for the data and analyses reported in the above manuscript. This includes a detailed and commented R script that was used for statistical analysis and to generate the figures used in the manuscript. Analyses are briefly described in the Analysis Description module; more detail on the analyses can be found in the manuscript. The raw data are not posted, due to the large size of raw eye-tracking data. Instead, summary data files are posted, as used in analysis. The raw data are available as a Microsoft Access database from the first author, by request. This project includes the following components: - Data and analyses: A series of data files that were used in the analyses for this project, as well as the data used for curvefitting. This component also includes a detailed and commented R script that was used to conduct the analyses and generate figures. The R script calls the various data files using their listed names. - Stimuli: Zipped folders containing the visual and auditory stimuli used in this study. **Abstract** Efficient word recognition depends on the ability to overcome competition from overlapping words. The nature of the overlap depends on the input modality: spoken words have temporal overlap from other words that share phonemes in the same positions, whereas written words have spatial overlap from other words with letters in the same places. It is unclear how these differences in input format affect the ability to recognize a word and the types of competitors that become active while doing so. This study investigates word recognition in both modalities in children between 7 and 15. Children complete a visual-world paradigm eye-tracking task that measures competition from words with several types of overlap, using identical word lists between modalities. Results showed correlated developmental changes in the speed of target recognition in both modalities. Additionally, developmental changes were seen in the efficiency of competitor suppression for some competitor types in the spoken modality. These data reveal some developmental continuity in the process of word recognition independent of modality, but also some instances of independence in how competitors are activated.