# (AR) Number Line — Rediscover the number line

> Rediscover the number line (iPhone/iPad app by Christian Urff.)

- Source: https://appshunter.io/ios/app/ar-number-line/id6473689075 (this page in markdown: same URL + `.md`)
- Developer: [Christian Urff](https://appshunter.io/developer/415894463)
- Category: Education, Games, Strategy, Trivia
- Price: Free (on sale, was $1.99)
- Age rating: 4+
- Requires: iOS 17.0 · 11 MB
- Languages: English, French, German, Italian, Spanish
- Released: 2024-04-21
- Data updated: 2026-07-20
- User reviews in markdown: https://appshunter.io/ios/app/ar-number-line/id6473689075/reviews.md

## What is (AR) Number Line?

Number Line is a learning app for primary school and the lower secondary level that systematically supports the development of number concepts through number line estimation tasks. It offers multiple exploratory environments for independent investigation and presentation, as well as a wide range of exercises and games with individual, adaptive adjustment options.
At the core of the app is the number line in two variants: an augmented reality number line for exploring numbers “in space,” and a classic, non-AR number line for focused work on the screen. The AR number line is particularly suitable for developing number range concepts (especially in larger number ranges) and for learning through movement, while the classic number line enables a deeper engagement with numbers and numerical relationships. Using this dynamic tool, children place numbers, compare distances, find positions, discover relationships, and illustrate calculation strategies in an action-oriented way.
In addition, the app includes numerous practice formats and learning games centered on numbers on the number line, which are specifically designed to address different levels of learning. Tasks adapt to the learner’s abilities and support practice in small, motivating steps—ideal for independent work, learning stations, weekly plans, targeted support, or practice at home.
When errors occur or support is needed, children receive helpful feedback and hints from an AI tutor, which explains effective strategies for locating numbers and encourages further thinking. The AI tutor is optional, uses the internet, and can be deactivated at any time—ensuring flexibility for different teaching situations and needs. No personal data is transmitted when generating individualized feedback.
Number Line is suitable for explanation phases, demonstration phases, inquiry-based learning tasks, individual learning, partner work, as well as targeted diagnosis and support. The number range and numerous additional display options can be freely configured—from number ranges up to 20 to negative numbers and decimal numbers. A learning report provides teachers with ongoing information about children’s competencies and difficulties.
Please support the further development and improvement of the AI tutor by providing anonymized log data for scientific evaluation. This can be enabled easily in the settings. Thank you very much!


## Version history (last 5 releases)

### 2.2 — 2026-06-23

Minor stability and detail improvements.

### 2.1 — 2026-05-29

New:
Calculation Jumps – reach the target number with as few calculation jumps as possible (+, −, ×, :, jump to the next ten);
Number Pong – a Pong-style game: move the number line so that the target number is where the ball hits; single-player and two-player mode.
Interactive introduction: when opening the number line for the first time, and anytime via the ? icon, a short voice-guided interactive tour explains all features.
The AI tutor shows hints on the number line: together with spoken guidance, it can highlight numbers, mark the midpoint, show helper lines, or zoom in – offering orientation without revealing the solution.
Diagnostic note after each exercise (strategy, possible misconception, next learning step) – visible in the learning progress report.
Guide for “Calculation Jumps” (overview card at the start + explanatory tour via ?).
AI learning progress report with competence-oriented feedback on each child’s strengths.
Improved
Easier creation of child profiles (the checkmark confirms the name and immediately selects it).
Better display of decimal and negative numbers, dynamic zoom, fairer AI use, faster AI model, and offline notices.
Optimized stability, speed, and layout.
Fixed
Speech bubble text appears immediately; final score is calculated correctly; various layout/display issues and gesture conflicts have been fixed.

### 2.0 — 2026-02-05

New: Number Line as a complete learning environment – not only AR, but also a classic (non-AR) number line.
New: Multiple exploratory environments for discovering numbers, positions, and distances.
New: Many additional exercises and learning games for individualized, adaptive practice.
New: AI tutor with helpful feedback in case of errors (optional, can be switched off).

### 1.2 — 2025-08-12

Numerous improvements
Input possible via crosshair
Integration of research tasks (Number Line Estimation Tasks)

### 1.1 — 2024-10-04

•	Significant performance improvements for long number lines through dynamic display based on distance
	•	Improved presentation (backgrounds for text)
	•	Added option to darken the camera image for better contrast
	•	Added option to move pins by long-pressing and dragging
	•	Added option to delete pins by long-pressing and quickly dragging up or down
	•	Multiple numbers can now be marked
	•	Negative numbers on the number line can now be shown or hidden
	•	Team mode allows syncing number lines across multiple devices
	•	Color selection is now possible to customize the appearance of number markings and connecting arcs
	•	Localization for English, French, and Spanish added
	•	Numbers can now also be edited by tapping on the number display and tasks at the top of the screen, creating a synchronized representation between symbolic, iconic, and enactive levels
	•	Localizations added (English, Spanish, French, Italian)
	•	More settings options (e.g., automatic color changes, showing or hiding numbers, etc.)
	•	Haptic feedback added for supported devices
	•	Bug fixes

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## 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 2026-07-20.*