Rocket 123s is made and published by Donalee Markus. AppBrain is an independent app data site and isn't affiliated with Donalee Markus. The app name, icon, screenshots and description belong to Donalee Markus and are shown as published on the App Store.
AppBrain's verdict
Established- Rating on App Store
- 5.00
- 2 ratings
- Last updated
- May 11, 2026
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Releases
Updates seen on the App Store- Version
- 2.1
- Launched
- March 2018
No changelog data
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Technology
Found in the app by AppBrain- Price
- $5.99
- App size
- 165.9 MB
- Content rating
- Everyone
Technologies used by Rocket 123s
About the app and developer
About Rocket 123s
Rocket 123s is a games app developed by Donalee Markus.
User Ratings
Rocket 123s is rated 5.00 out of 5 stars. The rating is based on 2 ratings.
App Information
Rocket 123s costs $5.99. The app size is 165.87 MB. The latest version available is 2.1. The last update was on May 11, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on the App Store since March 2018.
Developer information for Donalee Markus
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Store listing
By Donalee Markus, from the App Store
Description by Donalee Markus Written by the developer, not by AppBrain. Click to read.
WHAT IT TEACHES
• Number recognition (1–10 and beyond)
• Form constancy — recognizing the same number across fonts and styles
• Number sorting and basic sequencing
• Foundations of mathematical reasoning
• Visual processing of numerical symbols
WHO IT'S FOR
• Children ages 3–7
• Pre-K and kindergarten learners
• Children with learning differences who benefit from explicit practice
• Children with delayed math readiness
• Used by parents, teachers, and clinicians
WHAT MAKES IT DIFFERENT
Rocket 123s is built on the same three-pillar neurocognitive model that Dr. Markus uses with adult patients — Attention, Intention, Rehearsal. The exercises are hierarchical and progressive, designed to build genuine skill rather than just keep a child engaged.
ABOUT THE DEVELOPER
Dr. Donalee Markus has practiced cognitive restructuring since 1983, including extensive work with children. She earned her Ph.D. at Northwestern University and completed post-doctoral training under Reuven Feuerstein.