Evidence-Based Learning

Real language learning, backed by science

Contextual vocabulary acquisition, spaced repetition, comprehension testing — the methods proven by decades of research. Delivered through illustrated stories your child actually wants to read. Not gamified entertainment. Structured reading that produces measurable results.

Try Free for 7 Days See How It Works

Available on iPhone and iPad · 7-day free trial on Annual plan

Three principles. Decades of research.

WonderBoox applies three well-established learning principles — each one independently proven, rarely combined in a single app for children.

1. Contextual vocabulary acquisition

Words learned in context are retained significantly better than words learned in isolation. Every definition in WonderBoox shows the word's meaning as used in that specific sentence — not a generic dictionary entry. Your child doesn't just memorise a translation; they understand how the word works.

2. Spaced repetition (SM-2 algorithm)

The same scheduling algorithm used by medical students and professional polyglots. Words reappear at scientifically optimal intervals — right before your child would forget them. The system automatically adapts: simpler choices for age 5–7, full 4-button reviews for teenagers.

3. Comprehension testing with feedback

Multiple-choice quizzes after each story test whether your child understood what they read — not just whether they can match vocabulary. Text mode, audio-only (listening comprehension), or both. 80%+ earns mastery status.

Measurable progress you can track

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Reading streaks

Consecutive days of reading

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Books finished

Per language, per child

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Words learned

Saved, reviewed, retained

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Quiz accuracy

Comprehension score %

8 unlockable achievements — from First Book to Polyglot. Built-in motivation without parent involvement.

Adapts to your child's age

Ages 5–7

Two large buttons for reviews. Shorter intervals. Gentler difficulty. Read-aloud narration with word-by-word highlighting. Audio quizzes — no reading required.

Ages 8–12

Three-button reviews. Moderate challenge. Streaks and achievements drive motivation. Text and audio quiz modes with mastery tracking.

Ages 13+

Full four-button interface with interval previews. Longer review intervals. Per-language vocabulary stats. The same system used by adult polyglots.

See the difference science makes

Structured reading in 9 languages. Spaced repetition. Comprehension quizzes. Progress tracking. All adapted to your child's age.

Try Free for 7 Days

7-day free trial on Annual plan