# Stone Echo vs 钢琴巴士

The clearest difference is price: 钢琴巴士 at Free against Stone Echo's $2.99. 钢琴巴士 also leads on update cadence (every 2 weeks vs every 38 months). Stone Echo's advantage is rating (2.8 vs 1.0) and in-app purchases (none vs 13). On review sentiment, ads and device support there is nothing between them.

钢琴巴士 is free to download; Stone Echo costs $2.99 up front. 钢琴巴士 sells 13 one-off in-app purchases. Stone Echo asks for nothing beyond the download.

Stone Echo holds the better App Store score, 2.8 against 1.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively. Written reviews point the same way: 50% of Stone Echo's written reviews are positive against 44% of 钢琴巴士's.

Stone Echo ships an update every 38 months, 钢琴巴士 every 2 weeks. Both last shipped on October 7, 2026.

## The numbers

| Metric | Stone Echo | 钢琴巴士 |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[2.8 (4 ratings)](https://appshunter.io/ios/app/stone-echo/id1354390681/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/id1607244680/reviews) |
| Number of ratings | **4** | 1 |
| Positive reviews | **50.0% of reviews** | 44.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 9 MB | 103 MB |
| Requires iOS | **10.0** | 12 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aleksandar Mlazev](https://appshunter.io/developer/1093798140) | [Shanghai Music Publishing House Co., Ltd.](https://appshunter.io/developer/651417370) |

## What reviewers say

### Stone Echo

[App page](https://appshunter.io/ios/app/stone-echo/id1354390681)

This app creates a unique echo effect with adjustable frequency modulation, inspired by Mayan pyramid acoustics. It offers musical and experimental soundscapes, functioning as a standalone application or an AUV3 plugin.

**Highlights:** Frequency changing echo effect, Phase modulated frequency, Standalone app and AUV3 plugin, Adjustable time, feedback, and level, UFO mode for experimental sounds

**Features:** Vision Pro support

**In-app purchases:** none


### 钢琴巴士

[App page](https://appshunter.io/ios/app/id1607244680)

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

**In-app purchases (13)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ABRSM英皇考级精选录播课（二级）-vip专属 | $4.99 | one-time |
| ABRSM英皇考级精选录播课（七级）-vip专属 | $6.99 | one-time |
| ABRSM英皇考级精选录播课（六级）-vip专属 | $6.99 | one-time |
| ABRSM英皇考级精选录播课（七级） | $7.99 | one-time |
| ABRSM英皇考级精选录播课（一级）-vip专属 | $7.99 | one-time |
| ABRSM英皇考级精选录播课（初级）-vip专属 | $9.99 | one-time |
| ABRSM英皇考级精选录播课（三级）-vip专属 | $9.99 | one-time |
| ABRSM英皇考级精选录播课（四级）-vip专属 | $9.99 | one-time |
| ABRSM英皇考级精选录播课（八级）-vip专属 | $9.99 | one-time |
| ABRSM英皇考级精选录播课（五级）-vip专属 | $12.99 | one-time |
| 钢琴巴士月卡会员 | $12.99 | one-time |
| 全年陪练卡 | $99.99 | one-time |
| 优惠年卡会员 | $149.99 | one-time |


## Frequently asked questions

### Is Stone Echo free?

Stone Echo costs $2.99, with no in-app purchases.

### Is 钢琴巴士 free?

钢琴巴士 is free to download, with in-app purchases available.

### Which has better reviews, Stone Echo or 钢琴巴士?

Stone Echo is rated higher. Stone Echo averages 2.8 out of 5 from 4 ratings, while 钢琴巴士 averages 1.0 from 1 ratings.

### Do Stone Echo or 钢琴巴士 have ads?

Neither Stone Echo nor 钢琴巴士 shows ads.

### Which is updated more often, Stone Echo or 钢琴巴士?

Stone Echo ships an update every 38 months, and 钢琴巴士 every 2 weeks. Most recently, Stone Echo was updated on October 7, 2026 and 钢琴巴士 on October 7, 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.*