The part I’m proudest of: you can search in letters you already have on your keyboard. Most people who want to look up a Sinhala, Tamil or Japanese word have no way to type it. So type it how it sounds — kohomada, arigatou, wamanaya — and Vocapedia works out which language you meant, finds the article in its own script, and if nobody has written it yet, writes it and keeps it there for the next person who asks.