# ePen vs Rainy AI

The clearest difference is price: Rainy AI at Free against ePen's $2.99. Rainy AI also leads on update cadence (every 5 days vs fortnightly). ePen's advantage is iOS requirement (10.0 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

Rainy AI is free to download; ePen costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ePen ships an update fortnightly, Rainy AI every 5 days. The most recent releases landed on October 23, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | ePen | Rainy AI |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.0 (2 ratings)](https://appshunter.io/ios/app/epen/id1433861346/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 90.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 5 days** |
| Monetization | Paid | — |
| Size | 726 MB | 846 MB |
| Requires iOS | **10.0** | 17.6 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [STUDIO A](https://appshunter.io/developer/1229645980) | [Chao Yi Chen](https://appshunter.io/developer/1809452800) |

## What reviewers say

### ePen

[App page](https://appshunter.io/ios/app/epen/id1433861346)

This app offers a digital canvas for calligraphy, ink painting, and various artistic functions. It includes customizable brushes, stroke pressure sensitivity, and options for personal stamps. The app also provides insights into Chinese character evolution and a gallery of calligraphy works.

**Highlights:** Calligraphic writing, Ink painting functions, Customizable brush sizes, Stroke pressure sensitivity, Personal stamp creation, Chinese character evolution insights, Calligraphy gallery

**In-app purchases:** none


### Rainy AI

[App page](https://appshunter.io/ios/app/rainy-ai/id6753078426)

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

**In-app purchases:** none


## Frequently asked questions

### Is ePen free?

ePen costs $2.99, with no in-app purchases.

### Is Rainy AI free?

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

### Do ePen or Rainy AI have ads?

Neither ePen nor Rainy AI shows ads.

### Which is updated more often, ePen or Rainy AI?

ePen ships an update fortnightly, and Rainy AI every 5 days. Most recently, ePen was updated on October 23, 2026 and Rainy AI on October 30, 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.*