# ARpaca vs D

The clearest difference is update cadence: D at weekly against ARpaca's fortnightly. D also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ARpaca ships an update fortnightly, D weekly. The most recent releases landed on September 9, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | ARpaca | D |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/d-lab/id6745396642/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 52.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | — | Free |
| Size | 89 MB | 106 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Masaki Cho](https://appshunter.io/developer/1728607801) | [keigo matsumaru](https://appshunter.io/developer/1405989123) |

## What reviewers say

### ARpaca

[App page](https://appshunter.io/ios/app/arpaca/id6477148951)

**In-app purchases:** none


### D

[App page](https://appshunter.io/ios/app/d-lab/id6745396642)

Learn psychology with AI-powered video content and interactive tools. Access thousands of videos, get personalized advice from an AI assistant, and explore various expert-led sub-channels. This service helps you apply knowledge to enrich your life.

**Highlights:** AI-powered psychology video library, AI DaiGo assistant for questions, AI-generated podcasts and slides, Automated video chaptering, AI goal achievement coaching, Expert-led sub-channels

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

**In-app purchases:** none


## Frequently asked questions

### Is ARpaca free?

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

### Is D free?

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

### Do ARpaca or D have ads?

Neither ARpaca nor D shows ads.

### Which is updated more often, ARpaca or D?

ARpaca ships an update fortnightly, and D weekly. Most recently, ARpaca was updated on September 9, 2026 and D on September 19, 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.*