# Piece Word vs CastMind

The clearest difference is price: Piece Word at Free against CastMind's $5.99. Piece Word also leads on iOS requirement (13.0 vs 17.0). CastMind's advantage is in-app purchases (none vs 7) and update cadence (every 2 weeks vs every 3 weeks). On ads and device support there is nothing between them.

Piece Word is free to download; CastMind costs $5.99 up front. Piece Word sells 7 in-app purchases, starting at $0.99 per 7 days. CastMind asks for nothing beyond the download.

Piece Word ships an update every 3 weeks, CastMind every 2 weeks. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Piece Word | CastMind |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Size | 4 MB | 15 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [剑桥 杨](https://appshunter.io/developer/1779132006) | [文 杨](https://appshunter.io/developer/6785084591) |

## What reviewers say

### Piece Word

[App page](https://appshunter.io/ios/app/piece-word-languages-learning/id6756593922)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 周卡订阅 | $0.99 | per 7 days |
| 月卡订阅 | $3.99 | per month |
| Weekly Member | $9.90 | per 7 days |
| Monthly Membership | $14.90 | per month |
| 年会员 | $14.99 | per year |
| Annual Membership | $99.00 | per year |
| 永久会员 | $39.99 | one-time |


### CastMind

[App page](https://appshunter.io/ios/app/castmind/id6785098787)

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

**In-app purchases:** none


## Frequently asked questions

### Is Piece Word free?

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

### Is CastMind free?

CastMind costs $5.99, with no in-app purchases.

### Do Piece Word or CastMind have ads?

Neither Piece Word nor CastMind shows ads.

### Which is updated more often, Piece Word or CastMind?

Piece Word ships an update every 3 weeks, and CastMind every 2 weeks. Most recently, Piece Word was updated on October 25, 2026 and CastMind on October 31, 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.*