EstudIA brings four evidence-based study techniques into a single free web app. Spaced repetition schedules reviews so material sticks past the exam. A Pomodoro timer keeps sessions focused and time-boxed. The Feynman technique module uses AI to identify gaps in your explanations — surfacing exactly what you haven't fully understood yet, not just what you haven't memorized. An exam generator builds practice tests from your own material so you can rehearse under realistic conditions before the real thing. Built by a bachillerato student in Spain who spent months reading Cal Newport, Barbara Oakley, and the spaced repetition literature before coding what he actually needed. He's been using it on his own coursework for two trimesters: 10 in Technology, 9.5 in Physics, 10 in PE. Free to use, no account required.