---
title: "ARPen: Mid-Air Interactions — App Overview"
url: https://marlvel.ai/intel-report/productivity/arpen-mid-air-interactions
category: Productivity
developer: RWTH Aachen University
platforms: ios
rating: 2.5 (2 ratings)
pricing: free
report_level: overview
generated: 2026-05-04
last_verified: "2026-05-04T07:54:11.789Z"
---

<!-- SECTION: Key Insight -->
> **Key Insight:** ARPen is a specialized research tool for mid-air 3D design that offers advanced geometric operations and hardware integration for custom input devices.

<!-- SECTION: Quick Facts -->
| Metric | Value |
|--------|-------|
| Category | Productivity |
| Rating | 2.5 ★ (2) |
| Pricing | free |
| Platforms | iOS |
| Latest Version (iOS) | 2.1 |
| Developer | RWTH Aachen University |

<!-- SECTION: Summary -->
## What is ARPen: Mid-Air Interactions?

ARPen is an augmented reality tool developed by RWTH Aachen University that enables users to create 3D models by drawing in mid-air. It supports both marker-based tracking and custom Bluetooth hardware, allowing for complex geometric modeling and spatial manipulation. The app serves as a research-oriented platform for exploring mid-air interaction techniques and depth visualization.

<!-- SECTION: Key Features -->
## Key Features

- **Mid-Air Modeling**: Enables freehand painting and the creation of complex geometries using sweeps, lofts, and boolean operations.
- **Spatial Manipulation**: Provides tools for moving, rotating, and scaling 3D objects within the augmented reality environment.
- **Depth Visualization**: Includes specific techniques to help users perceive the pen tip's position relative to other objects in the scene.
- **Export Functionality**: Allows users to save and export completed sketches and models in the .STL file format.

<!-- SECTION: Target Audience -->
## Who is it for?

Designers, researchers, and makers interested in spatial computing and mid-air 3D modeling.

<!-- SECTION: Links -->
## Links

- [App Store](https://apps.apple.com/us/app/arpen-mid-air-interactions/id1459493311?uo=4)
- [Full Intelligence Report](https://marlvel.ai/intel-report/productivity/arpen-mid-air-interactions)

---
*This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/intel-report/productivity/arpen-mid-air-interactions).*
*Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*