AI-powered vocabulary builder

Master words with Word Ninja

Collect words, get instant AI translations, generate real example sentences, and let spaced repetition lock them into your long-term memory.

Everything you need to build vocabulary

Designed for focused daily practice, from first encounter to true mastery.

5-stage review schedule: New → 1 month → 3 months → 6 months → Mastered. Each review pushes the word deeper into memory.

Type a word and instantly get context-aware translations in the language you are learning.

Generate real-world sentences with one click to see how the word lives in context.

Flip cards to reveal translations, skip what you know, and mark words as learned when you are ready.

Group words by topic and filter your deck so you always study exactly what matters right now.

Track daily learning with a heatmap and stats: today, last 7 days, last 30 days, and all-time.