ARPen vs PlotPilot
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
PlotPilot
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PlotPilot: Your AI Architectural Partner Bridge the gap between vision and visualization. PlotPilot is a professional-grade tool designed for architects, designers, and real estate visionaries who need to explore architectural possibilities at the speed of thought. Whether you are starting a hilltop villa, a minimalist residence, or a commercial development, PlotPilot takes your project constraints—budget, scale, priority, and site context—and generates three unique, high-fidelity design directions. How it works: 1. Define the Brief: Input your project name, type, and approximate scale. 2. Set the Intent: Choose between Lifestyle (comfort), Profit (ROI), or Sustainability. 3. Style your Vision: Describe your aesthetic—from "brutalist concrete" to "warm timber minimalist." 4. Site Context: Upload a site photo to help the AI understand your topography. 5. Generate: Receive three distinct architectural concepts with deep analysis. Key Features: - Triple Concept Generation: Never settle for one idea. Get three distinct perspectives for every brief. - Deep Analysis: Each concept includes metrics for Daylight Performance, Privacy Levels, and Budget Feasibility. - Strengths & Tradeoffs: Professional analysis of every design direction to guide your decision-making. - Private by Design: We don't collect your data. Project details are processed temporarily via NVIDIA NIM and stored exclusively on your device. - Premium Interface: A sleek, dark-mode experience designed for the modern professional. PlotPilot is not just an image generator; it’s a concept engine that understands architectural priorities.
Screenshots
Verdict
The clearest difference is device support: ARPen at 2 against PlotPilot's —. ARPen also leads on iOS requirement (14.2 vs 17.0). On price and in-app purchases 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.
| Parameter | ARPen | PlotPilot |
|---|---|---|
| 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 | — |
| Ads | No | — |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod — better | — |
| Requires iOS | 14.2 — better | 17.0 |
| Further details — not scored | ||
| Size | 55 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | RWTH Aachen University | Cagil Durgun |
In-app purchases
ARPen
No in-app purchases
PlotPilot
No in-app purchases









