# Sustainable world AR vs e 筆

The clearest difference is ads: e 筆 at none against Sustainable world AR's shown. Sustainable world AR's advantage is device support (3 vs 1) and iOS requirement (11.0 vs 16.0). On price, update cadence and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on December 2, 2025 and October 9, 2026 respectively.

## The numbers

| Metric | Sustainable world AR | e 筆 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/e/id1628710051/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | — | Free |
| Size | 353 MB | 162 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lu Su-Ju](https://appshunter.io/developer/1358122313) | [STUDIO A](https://appshunter.io/developer/1229645980) |

## What reviewers say

### Sustainable world AR

[App page](https://appshunter.io/ios/app/sustainable-world-ar/id1618303111)

**Features:** macOS Compatibility

**In-app purchases:** none


### e 筆

[App page](https://appshunter.io/ios/app/e/id1628710051)

Practice calligraphy and drawing with adjustable stroke thickness and background grids. Features dedicated modes for stroke control, character practice, and poetry writing, allowing users to save their creations. Ideal for all ages to experience the joy of writing without traditional tools.

**Highlights:** Adjustable stroke thickness and color, Customizable background grids, Dedicated character practice modes, Poetry writing feature, Save and store created works, Suitable for all ages

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Sustainable world AR free?

Sustainable world AR is free to download, with no in-app purchases.

### Is e 筆 free?

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

### Do Sustainable world AR or e 筆 have ads?

Sustainable world AR shows ads; e 筆 does not.

### Which is updated more often, Sustainable world AR or e 筆?

Sustainable world AR ships an update every 3 weeks, and e 筆 every 3 weeks. Most recently, Sustainable world AR was updated on December 2, 2025 and e 筆 on October 9, 2026.

---

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