PD Meter vs Hi Echo 虚拟人口语私教
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PD Meter
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.
- AI-powered binocular interpupillary measurement
- Contactless measurement method
- High accuracy (0.1mm)
- Manual error correction
- Supports FPD and NPD measurements
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MEIDAI Interpupillometer is the world's first app which using AI technology for binocular interpupillary measurement. Using it can avoid the risk that traditional handheld interpupillometers requiring doctors and users facing each other in a extreme close distance (approximately 20cm). [Accuracy] 0.1mm [Result error] 0.3-0.5mm [Tips for use] For FPD measurement, focus at least 4 meters away. For NPD measurement, please follow the "distance reminder". [Steps] (1) Adjusting the face to the camera (2) Keep your face steady when prompted (3) Focus distance required to adjust sight * Use interpupillary distance for distance, look beyond the "tip arrow" to see the distance * Close to interpupillary distance, focus on "tip arrow" camera (4)) Click [Measure] to get interpupillary results (5) The errors in AI's pupil recognition can be corrected manually. For further technical support from professional organizations, please contact us: WeChat: 13957778558 Email: support@meidaitech.com Official Website: https://www.meidaitech.com
Hi Echo 虚拟人口语私教
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.
- 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
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Hi Echo，全球首个Agent口语私教，1000万人练口语的选择。 【随时随地一对一练口语，自然畅聊无压力】 • 24小时随时随地开口练，从感兴趣的话题聊起，碎片时间也能练口语 • 实时语音对话，响应更快，支持随时插话打断，交流更自然流畅 • AI耐心引导、主动追问，帮你持续表达，社恐也能轻松开口 • 自由聊天、话题练习、情景角色扮演，满足不同口语练习需求 • 在对话间隙提供发音、语法反馈，边聊边改进，不打断表达节奏 • 发音标准纯正，地道英、美式口音 【目标定制任务地图，每天知道练什么】 • 说出学习目标，结合口语水平、练习周期和每日可用时间，定制专属练习计划 • 将目标拆解为每日任务，从备考到旅行、日常交流，一步步练得更有方向 • 根据实际练习表现，动态调整后续内容与难度，针对性补强薄弱项 • 任务进度、学习日历一目了然，方便安排练习，逐步养成开口习惯 • 学习报告总结进步与不足，提供后续练习建议，让每次练习有所积累 【擅长多领域话题，在真实对话语境中练习口语】 • 覆盖 15 + 对话场景和 100 + 话题，包括考试话题、生活经历、个人相关、食物、兴趣、旅行等话题 • 支持自定义对话，想怎么聊就怎么聊 • 话题分类细致，提供专业地道的词汇和表达，实用性强 • 相比真人口语教练知识面更广泛，口语表达更专业 【全方位评估，提供学习报告】 • 每轮对话从发音、语法、AI润色三维度打分并输出针对性建议 • 发音支持音素级单词纠音，附带标准音标；AI润色区分地道表达、高级表达，帮用户优化话术，打磨更完善的口语表达 【会员自动续费说明】 • 服务名称：Hi Echo连续包月服务（或Hi Echo连续包年服务） • 价格：连续包月，每月168元，次月起每月168元；连续包年，首次498元/年，次年起每年498元 • 购买会员自动续费的账号，会在每个月（或年）到期前24小时，自动在iTunes账户扣费并延长1个月（或1年）会员有效期。 • 如需取消订阅，请手动打开苹果手机“设置”-->进入“iTunes Store与App Store”-->点击“Apple ID”，选择“查看Apple ID”，进入“账户设置”页面，点击“订阅”，选择Hi Echo连续包月服务（或Hi Echo连续包年服务）取消订阅即可。如未在订阅期结束的至少24小时前关闭订阅，此订阅将会自动续订。 • 会员自动续费服务协议：https://c.youdao.com/dict/law/renew_HiEcho.html • 隐私协议：https://c.youdao.com/dict/law/HiEcho_service.html
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | PD Meter | Hi Echo 虚拟人口语私教 |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (4 ratings) | 3.9 (144 ratings) — better |
| Positive reviews | 25.0% of reviews | 59.1% of reviews — better |
| Number of ratings | 4 | 144 — better |
| Update frequency | Monthly | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 93 MB | 196 MB |
| Age rating | 4+ | 4+ |
| Developer | 杭州美戴科技有限公司 | Beijing NetEase Youdao Computer System Co.,Ltd |
Customer experience
PD Meter
Hi Echo 虚拟人口语私教
In-app purchases
PD Meter
No in-app purchases
Hi Echo 虚拟人口语私教
- Hi Echo 连续包月服务$9.991 Month
- 3天免费+包月套餐3 Days trial$9.991 Month
- VIP包月服务$24.991 Month
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- TalkEase VIP 3天试用+连续包月服务3 Days trial$28.991 Month
- TalkEase VIP连续包月服务$28.991 Month
- Hi Echo 雅思臻享连续包月服务$34.991 Month
- TalkEase 3天免费试用+连续包季套餐3 Days trial$39.993 Months
- TalkEase VIP连续包季套餐服务$39.993 Months
- SVIP包月服务$39.991 Month
- SVIP包月服务$49.991 Month
- Hi Echo 连续包年服务$69.991 Year
- 会员年卡3 Days trial$69.991 Year
- Hi Echo连续包年服务1 Year trial4 variants$69.991 Year
- TalkEase VIP连续包年套餐服务$89.991 Year
- Hi Echo 雅思臻享连续包年服务$149.991 Year
- SVIP包年服务（优惠200元）1 Year trial$149.991 Year
- SVIP包年服务（优惠300元）1 Year trial$149.991 Year
- SVIP包年服务（优惠400元）1 Year trial$149.991 Year
- Hi Echo 10小时加量包$8.99
- Hi Echo 30小时加量包$17.99
- Hi Echo 60小时加量包$19.99
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- Hi Echo 雅思臻享月度会员服务$34.99
- Hi Echo 雅思臻享季度会员服务$44.99
- Hi Echo 雅思专属60小时加量包$49.99
- Hi Echo 雅思臻享季度会员服务$49.99
- Hi Echo VIP年度会员$59.99
- Hi Echo 年度会员服务$69.99
- SVIP季度服务$89.99
- Hi Echo 订阅1年$99.99
- Hi Echo 雅思臻享年度会员服务$179.99
