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.

*** "Outstanding" --- 5/5 "Best of the Best"

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

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

Studio Goojaji is a participant of the Know What's Inside(R) program for Family Friendly Developers. For more information, visit

-- 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.

-- 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 2.3.2

Please take a moment to RATE and REVIEW Planet Lettra on the App Store (or update your rating for the new version).

- fixed bug where touch was moving sleeping potion bubble that was nowhere near the touch
- fixed minor bugs related to text-to-speech
- added speech rate control to iPad Settings, just in case...

For any questions or comments, please email me at . I'd love to hear from you.

Ratings and Reviews

Not what I expected

Jamflower Live

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

Developer Response

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

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!

Cute but


The letters go together too easily and gets frustrating.

Developer Response

Sorry you're feeling frustrated, but you'll be glad to know you can control how the bubbles combine. The ring on the planet in the upper right corner of the screen controls how easily the bubbles combine. 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.


Gregory McDonald
127.7 MB
Requires iOS 8.1 or later. Compatible with iPhone, iPad, and iPod touch.
English, French, Spanish
Age Rating
Rated 4+
© 2016 Gregory McDonald


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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