ARPen vs Builder Lead Converter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ARPen
Create 3D drawings and models in mid-air using a marker or a custom Bluetooth pen. Explore advanced geometry creation, object manipulation, and depth visualization. Export your creations as STL files.
- Draw freehand in mid-air
- Create simple and complex geometries
- Manipulate objects in 3D space
- Explore depth visualization
- Export models as STL files
- Use marker or custom Bluetooth pen
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The ARPen application enables you to draw in mid-air. By tracking a marker, lines can be created that keep their position in the real world. Printing out a marker is all that is needed to test out this interaction. Or you can build a custom Bluetooth pen to have more options. The pen can be built using simple electronic components and machinery in your local Fab Lab. Detailed instructions are available at http://hci.ac/arpen-ios. With this app you can: - paint freehand in mid-air - create simple geometry shapes like cubes - create complex geometries using sweeps, lofts, revolutions, and merge&intersect operations - explore techniques for moving, rotating, and scaling objects in mid-air - explore different menu techniques - explore depth visualization techniques to show the position of the pen tip relative to other objects in the scene - export the sketch or model as an *.STL file This application is part of the Personal Photonics project, which is funded by the German Federal Ministry of Education and Research (BMBF) as part of their Open Photonics call. For more information, visit https://hci.rwth-aachen.de/arpen
Builder Lead Converter
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Welcome to Builder Lead Converter, a top-rated app that revolutionizes the way you manage your leads and streamline your sales process. With our app you can integrate multiple conversational tools from various sources, all in the palm of your hand. Say goodbye to the hassle of switching between different platforms and hello to a centralized hub that offers you a comprehensive view of your sales pipelines. Effortlessly keep track of your pipeline stages, leads, calls, opportunities and appointments, all within our intuitive and user-friendly interface. Our cutting-edge technology and robust features enable you to maximize your productivity and elevate your sales game. Our app empowers you to stay on top of your leads while on-the-go and enables you to respond to your customers' needs in real-time.
Screenshots
Verdict
The clearest difference is update cadence: Builder Lead Converter at every 2 months against ARPen's every 4 months. ARPen's advantage is iOS requirement (14.2 vs 16.6). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
ARPen ships an update every 4 months, Builder Lead Converter every 2 months. The most recent releases landed on October 9, 2026 and October 27, 2026 respectively.
| Parameter | ARPen | Builder Lead Converter |
|---|---|---|
| Price | Free | Free |
| Rating | 2.5 (2 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 14.2 — better | 16.6 |
| Further details — not scored | ||
| Size | 55 MB | 343 MB |
| Age rating | 4+ | 17+ |
| Developer | RWTH Aachen University | Builder Lead Converter |
In-app purchases
ARPen
No in-app purchases
Builder Lead Converter
No in-app purchases









