# 空气质量 vs Hi Echo 虚拟人口语私教

The clearest difference is in-app purchases: 空气质量 at none against Hi Echo 虚拟人口语私教's 33. 空气质量 also leads on rating (4.2 vs 3.9) and review sentiment (69% vs 59%). Hi Echo 虚拟人口语私教's advantage is update cadence (every 3 weeks vs every 4 months) and ratings volume (144 vs 40). On price, ads and device support there is nothing between them.

Both are free to download. Hi Echo 虚拟人口语私教 sells 30 in-app purchases, starting at $9.99 per month. 空气质量 asks for nothing beyond the download.

空气质量 holds the better App Store score, 4.2 against 3.9. Both are backed by a comparable volume of ratings — 40 and 144 respectively. Written reviews point the same way: 69% of 空气质量's written reviews are positive against 59% of Hi Echo 虚拟人口语私教's.

空气质量 ships an update every 4 months, Hi Echo 虚拟人口语私教 every 3 weeks. The most recent releases landed on October 16, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | 空气质量 | Hi Echo 虚拟人口语私教 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (40 ratings)](https://appshunter.io/ios/app/id741968835/reviews)** | [3.9 (144 ratings)](https://appshunter.io/ios/app/hi-echo/id6454838455/reviews) |
| Number of ratings | 40 | **144** |
| Positive reviews | **68.8% of reviews** | 59.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 10 MB | 196 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [方元 朱](https://appshunter.io/developer/468596269) | [Beijing NetEase Youdao Computer System Co.,Ltd](https://appshunter.io/developer/840227969) |

## What reviewers say

### 空气质量

[App page](https://appshunter.io/ios/app/id741968835)

Get real-time air quality information for your city and globally. Track PM2.5, temperature, humidity, and other key metrics. Understand pollution levels through color-coded categories for health awareness.

**Highlights:** Real-time air quality index (AQI), PM2.5 and PM10 tracking, Temperature and humidity monitoring, Global city air quality data, Color-coded pollution level indicators, Detailed pollutant information

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

**In-app purchases:** none


### Hi Echo 虚拟人口语私教

[App page](https://appshunter.io/ios/app/hi-echo/id6454838455)

Practice English conversation anytime, anywhere with an AI tutor. Get instant feedback on your speaking, grammar, and vocabulary. Ideal for improving fluency and confidence in various real-life scenarios.

**Highlights:** AI-powered one-on-one conversation practice, 24/7 availability, Covers 10 scenarios and 88 topics, Provides speaking scores and detailed reports, Offers optimization suggestions for grammar and vocabulary, Simulates real-life dialogue

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

**In-app purchases (30)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hi Echo 连续包月服务 | $9.99 | per month |
| 3天免费+包月套餐 | $9.99 | per month |
| VIP包月服务 | $24.99 | per month |
| TalkEase VIP 3天试用+连续包月服务 | $28.99 | per month |
| TalkEase VIP连续包月服务 | $28.99 | per month |
| Hi Echo 雅思臻享连续包月服务 | $34.99 | per month |
| TalkEase 3天免费试用+连续包季套餐 | $39.99 | per 3 months |
| TalkEase VIP连续包季套餐服务 | $39.99 | per 3 months |
| SVIP包月服务 | $39.99 | per month |
| SVIP包月服务 | $49.99 | per month |
| Hi Echo 连续包年服务 | $69.99 | per year |
| 会员年卡 | $69.99 | per year |
| Hi Echo连续包年服务 | $69.99 | per year |
| TalkEase VIP连续包年套餐服务 | $89.99 | per year |
| Hi Echo 雅思臻享连续包年服务 | $149.99 | per year |
| SVIP包年服务（优惠200元） | $149.99 | per year |
| SVIP包年服务（优惠300元） | $149.99 | per year |
| SVIP包年服务（优惠400元） | $149.99 | per year |
| Hi Echo 10小时加量包 | $8.99 | one-time |
| Hi Echo 30小时加量包 | $17.99 | one-time |
| Hi Echo 60小时加量包 | $19.99 | one-time |
| Hi Echo 雅思臻享月度会员服务 | $34.99 | one-time |
| Hi Echo 雅思臻享季度会员服务 | $44.99 | one-time |
| Hi Echo 雅思专属60小时加量包 | $49.99 | one-time |
| Hi Echo 雅思臻享季度会员服务 | $49.99 | one-time |
| Hi Echo VIP年度会员 | $59.99 | one-time |
| Hi Echo 年度会员服务 | $69.99 | one-time |
| SVIP季度服务 | $89.99 | one-time |
| Hi Echo 订阅1年 | $99.99 | one-time |
| Hi Echo 雅思臻享年度会员服务 | $179.99 | one-time |


## Frequently asked questions

### Is 空气质量 free?

空气质量 is free to download, with no in-app purchases.

### Is Hi Echo 虚拟人口语私教 free?

Hi Echo 虚拟人口语私教 is free to download, with in-app purchases available.

### Which has better reviews, 空气质量 or Hi Echo 虚拟人口语私教?

空气质量 is rated higher. 空气质量 averages 4.2 out of 5 from 40 ratings, while Hi Echo 虚拟人口语私教 averages 3.9 from 144 ratings.

### Do 空气质量 or Hi Echo 虚拟人口语私教 have ads?

Neither 空气质量 nor Hi Echo 虚拟人口语私教 shows ads.

### Which is updated more often, 空气质量 or Hi Echo 虚拟人口语私教?

空气质量 ships an update every 4 months, and Hi Echo 虚拟人口语私教 every 3 weeks. Most recently, 空气质量 was updated on October 16, 2026 and Hi Echo 虚拟人口语私教 on October 22, 2026.

---

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