Clozemaster

Clozemaster is a vocabulary practice app that teaches Vietnamese through short sentence drills instead of traditional lessons. You fill in the missing word, review items with spaced repetition, and work through common words in context. It is a better fit once you already know basic Vietnamese spelling, pronunciation, and core grammar than for someone starting from zero.

The main appeal is that you practice words inside real sentences, which helps you notice usage and sentence patterns rather than memorizing isolated lists. You can play in multiple choice or text input mode, and the app includes audio and review sessions. Clozemaster also has an AI Explain feature that gives extra grammar or usage help when you miss a sentence.

The free version lets you play, while Pro adds more control over gameplay, extra stats, favorites, and other advanced features. The app is clearly still active, with recent updates on both the App Store and Google Play. You can browse Vietnamese on Clozemaster's Vietnamese page to see how the sentence based approach works.

Where it falls short is structure. This is not a step by step Vietnamese course, so it will not walk you through pronunciation, tones, or grammar in a beginner friendly order. It can also feel repetitive over time, especially if you prefer longer lessons or conversation practice. As a supplement for reading and vocabulary growth, though, it is useful.