The present exploratory study investigated the efficacy of secondary face-to-face classroom-based English as a Foreign Language (EFL) instruction digitally supported by the FeedBook, an interactive computer assisted language learning web-based suite of exercises providing item-level scaffolded feedback. Seventy-seven native (L1) German seventh-grade students used the FeedBook during four two-week training periods (cycles, here we analyse Cycle 2 and 3). Classroom and FeedBook practice occurred in parallel, except for grammar constructions for which only FeedBook practice was provided (controls). At the end of Cycle 3, students engaged in a classroom-based communicative task for which the practised constructions were relevant. Custom-designed pre- and post-tests, administered via the FeedBook, assessed language accuracy in each cycle. Mixed-effect models revealed significant pre-/post-test accuracy gains independent of the learners’ proficiency in English, but not in controls. Gains from digitally supported instruction were also positively related to accurate use of EFL grammar constructions in the communicative task. Overall, the results indicate learning benefits for face-to-face classroom-based instruction supported by the FeedBook, evidenced both in grammar tests and in communicative activities.