# SubFrenzy vs Echo回声练习

The clearest difference is in-app purchases: Echo回声练习 at none against SubFrenzy's 4. Echo回声练习 also leads on iOS requirement (13.0 vs 17). SubFrenzy's advantage is update cadence (every 9 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. SubFrenzy sells 2 one-off in-app purchases. Echo回声练习 asks for nothing beyond the download.

SubFrenzy ships an update every 9 days, Echo回声练习 every 3 weeks. The most recent releases landed on October 5, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | SubFrenzy | Echo回声练习 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 weeks |
| Size | 202 MB | 118 MB |
| Requires iOS | 17 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [晓明 张](https://appshunter.io/developer/1848246404) | [锐华 甘](https://appshunter.io/developer/6787809326) |

## What reviewers say

### SubFrenzy

[App page](https://appshunter.io/ios/app/subfrenzy/id6754524811)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 小幕狂听 | $9.99 | one-time |
| 小幕狂听 | $14.99 | one-time |


### Echo回声练习

[App page](https://appshunter.io/ios/app/echo/id6787870760)

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

**In-app purchases:** none


## Frequently asked questions

### Is SubFrenzy free?

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

### Is Echo回声练习 free?

Echo回声练习 is free to download, with no in-app purchases.

### Do SubFrenzy or Echo回声练习 have ads?

Neither SubFrenzy nor Echo回声练习 shows ads.

### Which is updated more often, SubFrenzy or Echo回声练习?

SubFrenzy ships an update every 9 days, and Echo回声练习 every 3 weeks. Most recently, SubFrenzy was updated on October 5, 2026 and Echo回声练习 on October 10, 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.*