# Rayo vs 英語守護獸

The clearest difference is ads: 英語守護獸 at none against Rayo's shown. 英語守護獸 also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, update cadence and in-app purchases there is nothing between them.

Both are free to download. Rayo sells 2 in-app purchases, starting at $4.99 per month and 英語守護獸 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Rayo ships an update every 4 days, 英語守護獸 every 3 days. The most recent releases landed on October 6, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Rayo | 英語守護獸 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 days | **Every 3 days** |
| Size | 68 MB | 310 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [HsuehChe Hsiao](https://appshunter.io/developer/1862522029) | [一創系統有限公司](https://appshunter.io/developer/1896256915) |

## What reviewers say

### Rayo

[App page](https://appshunter.io/ios/app/rayo-ai-flashcards/id6756727229)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro | $4.99 | per month |
| Yearly Pro | $49.99 | per year |


### 英語守護獸

[App page](https://appshunter.io/ios/app/id6766261069)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TTS Unlock | $1.99 | one-time |


## Frequently asked questions

### Is Rayo free?

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

### Is 英語守護獸 free?

英語守護獸 is free to download, with in-app purchases available.

### Do Rayo or 英語守護獸 have ads?

Rayo shows ads; 英語守護獸 does not.

### Which is updated more often, Rayo or 英語守護獸?

Rayo ships an update every 4 days, and 英語守護獸 every 3 days. Most recently, Rayo was updated on October 6, 2026 and 英語守護獸 on October 18, 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.*