Rootlette: Vocabulary Builder
Word roots, stories, puzzles
Free · Designed for iPad. Not verified for macOS.
Most vocabulary apps teach you words. Rootlette teaches you the system underneath them.
English is built from a few hundred Latin and Greek roots. Learn bene (good) and you're already halfway to benevolent, benefactor, benediction, and beneficiary. Learn dict (say) and verdict, dictate, and contradict come cheap. That's the Rootlette method: every word you learn makes the next one easier.
A ritual, not a flashcard.
Each word is a 3–5 minute journey:
• Guess first. See the word's roots and take a real guess at its meaning before the definition appears — guessing before learning is one of the best-proven ways to make memory stick.
• Hear the story. A short, vivid etymology that turns the word into something you can't unlearn.
• Say it out loud. Pronunciation with syllables and stress, scored on your device.
• Use it. One quick production challenge to make the word yours.
Do one word a day or twenty — you set the pace, and nothing is ever locked.
Reviews disguised as games.
Spaced repetition runs invisibly underneath. Words you've learned resurface in a rotating daily puzzle — group words by their shared roots, guess the word from its definition in Wordle style, or order synonyms from weakest to strongest. Never a homework queue.
Watch your constellation grow.
Every word becomes a star in your personal night sky, clustered by root family. The better you know a word, the brighter it glows. Your progress isn't a number — it's a sky.
Built to respect you.
• Works completely offline — learn on the subway, on a flight, anywhere
• No account, no sign-up, no data collection — your progress lives on your device
• No hearts, no gems, no paywalls — every word is free, always
• Streaks with grace: freezes are earned, never bought
• One tasteful daily reminder, and only if you want it
Who it's for.
Word lovers, writers, and professionals sharpening their vocabulary — and anyone prepping for the GRE, SAT, or other exams where an etymology-first approach turns memorization into understanding.
Learn the roots. The words follow.
Ratings & Reviews
minor improvements and bug fixes.
The developer, Lightbulb Labs Company, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Lightbulb Labs Limited Liability Company
- Size
- 55.3 MB
- Category
- Education
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - iPad
Requires iPadOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2026 Lightbulb Labs LLC