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Vocab Builder
Vocabulary app

Build your English vocabulary a few minutes a day.

Learn English words offline with five short games, Daily Review and real pronunciation.

Get Vocab Builder See how it works
Voice and word packs need a one-time download. After that, practice works offline.
Vocab Builder Lobby: Daily Review, Continue and five games
Lobby with Today and Continue side by side

Start in three steps

  1. 1 Open Lobby See Daily Review for today and Continue on your collection path.
  2. 2 Play a short game Flashcards, listening, spelling or pronunciation — a few minutes is enough.
  3. 3 Build mastery Words move from New toward Mastered. Come back for Daily Review.

Five short games

Each game targets one skill. Wrong answers cost nothing — just try again.

Flashcards See the word, recall the meaning, flip for definition and examples.
Listen & Choose Hear the word or sentence, then tap the right meaning.
Listen & Type Hear it, then spell it. Great for tricky words.
Fill in the Blank Complete a sentence with the word you are learning.
Pronunciation Say the word and get instant on-device feedback.

Daily Review keeps words from slipping away

About 5–10 minutes a day. The app picks words you are about to forget — for example “7 min · 12 words due” — then marks the session done until tomorrow.

Spaced review

Come back on a schedule that matches how memory works.

Streaks

A gentle flame for days you practised — optional motivation, not punishment.

CEFR path

Collections from A1 toward B1 for everyday life, travel and work.

Collections to explore

Learn by level, by topic, or from essential lists. Jump in from Lobby chips like Travel, Food and Work.

Level CEFR-aligned units from A1 to B1 as packs are available.
Topic Travel, Food, Work and more everyday themes.
Essential High-frequency words you need first.
Works offline after download Download voice and word packs once. Then play and review without a signal.
No account needed Progress stays on your device. Up to 4 learner profiles on one phone.
Microphone stays on-device Pronunciation uses on-device speech. Ads, if any, only for adult profiles.

Questions

Does Vocab Builder work offline?

Games, Daily Review and progress run on your phone after voice and word packs are downloaded. Downloading packs needs an internet connection.

How is this different from KoalaSpeak?

KoalaSpeak is conversation practice with a koala friend, stories and roleplay. Vocab Builder focuses on vocabulary — Learn, Play and Review around word collections.

Do I need an account?

No. Progress stays on your device. You can create up to 4 learner profiles on one phone.

All questions and support

Coming to iPhone and Android

Release date to be announced. Store links appear here when they are live.
Download options

Prefer conversation practice with a koala friend? Meet KoalaSpeak