Planet Lettra 4+

A word building playground

Gregory McDonald

    • 4.3 • 33 Ratings
    • Free



"an outstanding app that will help young a playful, encouraging environment." --- 5/5 "Best of the Best" Sandra Fleming,

Bumping bubbles magically build words or invent your own to feed the silly creatures on Planet Lettra. Kids love this app for experimenting with word building and hearing what they've made.

Imagine a set of letter blocks that your child can arrange any way they want and hear what they've built, blocks that guide your child in building the most important sight words for reading fluency and give him or her lots of exposure to important letter blends, blocks that even form words all by themselves. That's Planet Lettra.

You can even go below the planet surface, into the belly of Lettra, to see the real words you've already fed to the Munchers, hear them read aloud individually or one after the other. Or rearrange the word bubbles to make silly sentence.

Whatever your child or student's age or reading ability, this app has plenty to discover and play with: green and purple Munchers that love to eat words, silly costumes, musical patterns, creatures with other special powers and more.

In classrooms and special ed settings, educators use Planet Lettra to scaffold student learning in spelling and phonics. Special pink bubbles can be assigned values in the Settings area and used to work on building words with specific parts (practice specific blends or rhymes).


• Play in English, French or Spanish
• A short video tour of the planet introduces new travellers to Planet Lettra and guides them in playing with the bubbles and creatures
• Planet Lettra recognizes over 100,000 words in each supported language.
• Words important to reading fluency (about 1000) are formed more easily and more often.
• The sound environment is musical, soothing and non-repetitive.
• Experiment and play without stress: there are no time limits, no levels to complete, no points to accumulate, no in-app purchases

-- Winner of a Children's Technology Review Editors Choice Award (2016)

-- School Library Journal ( "Children will be delighted to discover that double tapping on a bubble triggers the narrator to pronounce it, even if it is an invented word. This app supports word recognition as “smart” letter bubbles (when users hold down a bubble) hint at combinations that lead to real terms. The real joy here is in playfully discovering what letters can do.

-- "The open-ended platform allows kids full freedom to explore and empowers them to find words all on their own."

-- Educational App Store Certified, 4 stars, "This app is great for experimenting with word building and hearing what you have made. The app supports fantastic graphics and a unique playing experience."

What’s New

Version 2.3.3

This app has been updated by Apple to display the Apple Watch app icon.

A refreshing little update: build "SUMMER" with your young one for a surprise. Remember that tilting the ring all the way down on tiny Planet Permea (upper right corner) will keep the bubbles from blending unless you are touching BOTH bubbles and push them together. Lots of tips in the tour video: tap the button beside "Watch ME!" on the home screen.

Otherwise, just minor bug fixes. Thanks for travelling to Planet Lettra and have fun bumping bubbles and feeding the munchers.

Ratings and Reviews

4.3 out of 5
33 Ratings

33 Ratings

Fuzzmama ,

Phonics and word building fun

Used this excellent, fun, motivating app in my first grade classroom to reinforce learned skills and to explore and play in the world of letters and sounds. This app was fun for kids at all levels. They love exploring nonsense words and discovering real words. Great for English language learners!

Jamflower Live ,

Not what I expected

I want a phonics game for my son and this did not deliver. Very disappointed.

Developer Response ,

Most kids and adults love Lettra's open-ended play and experimentation, but it isn't for everybody. I'm sorry the app wasn't what you were expecting. I hope you find the kind of phonics game you're looking for and that your son can just explore Planet Lettra for fun.

Chattitychatchat ,

Cute but

The letters go together too easily and gets frustrating.

Developer Response ,

You can control how the letter bubbles combine with the ring on the planet in the upper right corner of the screen. If you pull the ring all the way to the bottom, the bubbles will only blend if you push two of them close together. Hope that helps.

App Privacy

The developer, Gregory McDonald, 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 Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

More By This Developer

Teen & Adult Phonics Library
Funny Phonemes
TAP Library School Edition

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