# Shake Box: Number Bonds — Shake & find the missing part

> Shake & find the missing part (iPhone/iPad app by Christian Urff.)

- Source: https://appshunter.io/ios/app/shake-box-number-bonds/id6821326920 (this page in markdown: same URL + `.md`)
- Developer: [Christian Urff](https://appshunter.io/developer/415894463)
- Category: Education
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 1 MB
- Languages: American English, German (Germany)
- Released: 2026-10-13
- Data updated: 2026-10-13

## What is Shake Box?

Shake Box makes number bonds visible: shake the counters and watch them land on two sides. Cover one side, let children guess how many are hiding, then lift the cover to check. This builds strong mental images that connect with numbers and number sentences – until children can work with the numbers alone.

• Guess first, then reveal: a number pad right on the cover; numbers larger than the whole can be locked
• Arranged like a real shake box: five in a row, then the next row on top (the structure of five); ten frame, dice patterns and more to choose from
• Part-whole model and fact family: addition and subtraction for every split, with the whole and the parts in color
• Number bonds house: collect and order all the ways to split a number
• Adjustable number range; shake evenly or like real counters
• Share via link or QR code; English and German
• No ads, no data collection, works offline

Developed in close collaboration with Hans-Joachim Lukow and Angelika Albert of the Osnabrück Centre for Mathematical Learning, for use alongside the German Schüttelbox program.

For pre-K, kindergarten, first grade and math intervention – at school and at home.

## Is Shake Box safe?

Not enough ratings yet to assess Shake Box.

## Is Shake Box legit?

Shake Box: Number Bonds appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Shake Box is 75 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-13

No release notes.

## More apps by Christian Urff

- [hundreds frame](https://appshunter.io/ios/app/hundreds-frame/id423532149)
- [Finger Numbers](https://appshunter.io/ios/app/finger-numbers/id455497654)
- [Numbers up to 100](https://appshunter.io/ios/app/numbers-up-to-100/id481817245)
- [Twenty frame for iPad](https://appshunter.io/ios/app/twenty-frame-for-ipad/id556083423)
- [Math Tablet](https://appshunter.io/ios/app/math-tablet/id574825573)
- [Calculation Triangle](https://appshunter.io/ios/app/calculation-triangle/id575736731)

All apps by Christian Urff: https://appshunter.io/developer/415894463

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-13.*