# PD Meter vs Hi Echo 虚拟人口语私教

The clearest difference is rating: Hi Echo 虚拟人口语私教 at 3.9 against PD Meter's 2.0. Hi Echo 虚拟人口语私教 also leads on review sentiment (59% vs 25%) and ratings volume (144 vs 4). PD Meter's advantage is in-app purchases (none vs 33) and iOS requirement (11.0 vs 15.0). On price, update cadence, 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. PD Meter asks for nothing beyond the download.

Hi Echo 虚拟人口语私教 holds the better App Store score, 3.9 against 2.0. That said, the two scores are not equally well evidenced: Hi Echo 虚拟人口语私教 has 144 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 25% of PD Meter's written reviews are positive against 59% of Hi Echo 虚拟人口语私教's.

PD Meter ships an update monthly, Hi Echo 虚拟人口语私教 every 3 weeks. The most recent releases landed on October 22, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | PD Meter | Hi Echo 虚拟人口语私教 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (4 ratings)](https://appshunter.io/ios/app/pd-meter/id1497268134/reviews) | **[3.9 (144 ratings)](https://appshunter.io/ios/app/hi-echo/id6454838455/reviews)** |
| Number of ratings | 4 | **144** |
| Positive reviews | 25.0% of reviews | **59.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 93 MB | 196 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [杭州美戴科技有限公司](https://appshunter.io/developer/1123653009) | [Beijing NetEase Youdao Computer System Co.,Ltd](https://appshunter.io/developer/840227969) |

## What reviewers say

### PD Meter

[App page](https://appshunter.io/ios/app/pd-meter/id1497268134)

This application uses AI technology to measure interpupillary distance accurately. It offers a contactless method for measurement, avoiding close proximity required by traditional devices. Users can manually correct any AI recognition errors for precise results.

**Highlights:** AI-powered binocular interpupillary measurement, Contactless measurement method, High accuracy (0.1mm), Manual error correction, Supports FPD and NPD measurements

**Features:** macOS Compatibility

**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 PD Meter free?

PD Meter 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, PD Meter or Hi Echo 虚拟人口语私教?

Hi Echo 虚拟人口语私教 is rated higher. PD Meter averages 2.0 out of 5 from 4 ratings, while Hi Echo 虚拟人口语私教 averages 3.9 from 144 ratings.

### Do PD Meter or Hi Echo 虚拟人口语私教 have ads?

Neither PD Meter nor Hi Echo 虚拟人口语私教 shows ads.

### Which is updated more often, PD Meter or Hi Echo 虚拟人口语私教?

PD Meter ships an update monthly, and Hi Echo 虚拟人口语私教 every 3 weeks. Most recently, PD Meter was updated on October 22, 2026 and Hi Echo 虚拟人口语私教 on October 30, 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.*