# ARPen vs slowDigest

The clearest difference is review sentiment: ARPen at 50% against slowDigest's 0%. ARPen also leads on rating (2.5 vs 1.0) and in-app purchases (none vs 3). slowDigest's advantage is update cadence (every 2 weeks vs every 4 months). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. slowDigest sells 3 in-app purchases, starting at $3.99 per month. ARPen asks for nothing beyond the download.

ARPen holds the better App Store score, 2.5 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews point the same way: 50% of ARPen's written reviews are positive against 0% of slowDigest's.

ARPen ships an update every 4 months, slowDigest every 2 weeks. Both last shipped on October 9, 2026.

## The numbers

| Metric | ARPen | slowDigest |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (2 ratings)](https://appshunter.io/ios/app/arpen-mid-air-interactions/id1459493311/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/slowdigest/id6772543845/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | **50.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | **Free** | Freemium |
| Size | 55 MB | 3 MB |
| Requires iOS | **14.2** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [RWTH Aachen University](https://appshunter.io/developer/371466796) | [Lucas Guillemot](https://appshunter.io/developer/6772543847) |

## What reviewers say

### ARPen

[App page](https://appshunter.io/ios/app/arpen-mid-air-interactions/id1459493311)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none


### slowDigest

[App page](https://appshunter.io/ios/app/slowdigest/id6772543845)

This app converts web articles into clean, typeset PDFs for e-readers. It removes ads and clutter, delivering content directly to devices like Kindle and Kobo. Enjoy a distraction-free reading experience optimized for e-ink screens.

**Highlights:** Article to PDF conversion, E-reader optimization, Ad and clutter removal, Supports Kindle, Kobo, reMarkable, Supernote, Boox, Customizable typography, Automatic digest delivery (Pro)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro — Monthly | $3.99 | per month |
| Pro — Annual | $29.99 | per year |
| Pro — Lifetime | $44.99 | one-time |


## Frequently asked questions

### Is ARPen free?

ARPen is free to download, with no in-app purchases.

### Is slowDigest free?

slowDigest is free to download, with in-app purchases available.

### Which has better reviews, ARPen or slowDigest?

ARPen is rated higher. ARPen averages 2.5 out of 5 from 2 ratings, while slowDigest averages 1.0 from 1 ratings.

### Do ARPen or slowDigest have ads?

Neither ARPen nor slowDigest shows ads.

### Which is updated more often, ARPen or slowDigest?

ARPen ships an update every 4 months, and slowDigest every 2 weeks. Most recently, ARPen was updated on October 9, 2026 and slowDigest on October 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*