Clozemaster

Clozemaster teaches vocabulary through fill-in-the-blank sentences drawn from real, authentic content rather than artificial dialogues. The platform uses spaced repetition to time reviews perfectly, and gamifies the process with points and leaderboards so you're competing against yourself and others rather than grinding through drill cards.

It works best for intermediate learners who've passed the absolute basics and want to absorb vocabulary the way it actually appears in native speech and text. The sentence-in-context approach beats isolated word lists because you learn usage, grammar, and collocation all at once, not just definitions.