# 卵石实习生 vs PolyEcho

The clearest difference is in-app purchases: 卵石实习生 at none against PolyEcho's 4. PolyEcho's advantage is update cadence (every 5 days vs every 3 weeks) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. PolyEcho sells 4 in-app purchases, starting at $12.99 per month. 卵石实习生 asks for nothing beyond the download.

卵石实习生 ships an update every 3 weeks, PolyEcho every 5 days. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | 卵石实习生 | PolyEcho |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/id6447495327/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Size | 164 MB | 207 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [世荣 肖](https://appshunter.io/developer/1306461311) | [楷博 尚](https://appshunter.io/developer/1801785390) |

## What reviewers say

### 卵石实习生

[App page](https://appshunter.io/ios/app/id6447495327)

**In-app purchases:** none


### PolyEcho

[App page](https://appshunter.io/ios/app/polyecho/id6743313316)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $12.99 | per month |
| Semi-Annual Subscription | $59.99 | per 6 months |
| Annual Subscription | $99.99 | per year |
| 5-Time Conversation Credit | $2.99 | one-time |


## Frequently asked questions

### Is 卵石实习生 free?

卵石实习生 is free to download, with no in-app purchases.

### Is PolyEcho free?

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

### Do 卵石实习生 or PolyEcho have ads?

Neither 卵石实习生 nor PolyEcho shows ads.

### Which is updated more often, 卵石实习生 or PolyEcho?

卵石实习生 ships an update every 3 weeks, and PolyEcho every 5 days. Most recently, 卵石实习生 was updated on November 3, 2026 and PolyEcho on November 8, 2026.

---

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