PolyU GreenCoin vs TalkAI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PolyU GreenCoin
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GreenCoin is an incentive-based programme at PolyU designed to promote campus-wide sustainability and recognize your efforts in making decarbonization impacts. By participating in selected sustainability activities and waste reduction actions, you can earn Coins through your mobile device. These Coins can then be redeemed for a variety of gifts and e-coupons, which are valid at various campus facilities. Join GreenCoin to make a difference and enjoy exclusive rewards for your sustainable actions!
TalkAI
Practice spoken language with an AI tutor that offers live video calls, chat practice, and real-time grammar correction. Access an intelligent vocabulary book and learn over 60 languages with adjustable speech speeds and conversation difficulty levels.
- AI live video call practice
- AI chat for language learning
- Real-time AI grammar correction
- Intelligent vocabulary book
- Supports 60+ foreign languages
- Adjustable speech speed and difficulty
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Many people believe that TalkAI is an epoch-making app for learning spoken language, and everyone is deeply shocked after experiencing it. We highly recommend that you take 60 seconds to experience it!!! Highlight 1: AI live video call, as if a teacher is always by your side to answer any questions you may have Highlight 2: AI chat, you can learn English through WeChat chat Highlight 3: AI grammar correction, casually speaking, if you make a mistake, the AI teacher will tell you where there is a problem Highlight 4: Intelligent vocabulary book, one click search for unfamiliar words, and future support for memorizing words after collection Highlight 5: Supports 60+ foreign languages, including learning English, Japanese, Korean, German, Spanish, and Chinese TalkAI uses cutting-edge AI technology to help you practice any language easily and confidently. Continuous conversation TalkAI supports multiple languages such as English, Chinese, Japanese, and German for oral practice. It adopts pure pronunciation and timbre, and supports different speech speed adjustments, allowing you to have a natural and smooth conversation with intelligent AI. We offer three levels of conversation difficulty: beginner, intermediate, and advanced. We track your conversation level and provide real-time feedback to help you intelligently achieve language learning goals. Sample Q&A When encountering situations of stagnation or inaccurate expression in the conversation, there is no need to be nervous. Our example question and answer function can be very helpful. With just a gentle click, the software will provide the most standard and authentic example expressions based on your voice input, guiding you to find the perfect answer. Translation&Follow up Our application also integrates translation and follow-up functions, allowing you to seamlessly translate any conversation into the desired language. Not only does it expand your vocabulary, but it also allows you to obtain authentic oral expressions, and applications can help you solve them perfectly. This means that you can focus on what is truly important - practicing your speaking skills - without worrying about language barriers or misunderstandings. Contact Us TalkAI speaking practice is a newly launched software that still has many features that can be optimized. Email contact cardnote@163.com Join us for a thought collision! Member Introduction and Usage Rules 1、 Permanent membership 1. Member privileges: unlimited number of oral conversations 2. Permanent Membership Service Agreement: a. Privacy Agreement: https://ttalkai.com/api/privacyPolicyIOS b. User Agreement: https://ttalkai.com/api/userAgreementIOS 2、 Automatic Subscription Service Description 1. Subscription Services: Talk Pro Continuous Package Week (7 days) Talk Pro Continuous Package Season (3 months) Talk Pro continuous package year (1 year) 2. Talk Pro benefits: During the membership period, there is no limit to the number of oral conversations that can be held 3. Payment: After the user confirms the purchase and makes the payment, it will be credited to their iTunes account 4. Automatic renewal: The Apple iTunes account will be deducted within 24 hours before the expiration date. After successful deduction, the subscription cycle will be extended by one subscription cycle. 5. Turn off the service: You can go to "iTunes Store and App Store" on your Apple phone, click on "Apple ID", select "View Apple ID", enter the "Account Settings" page, click "Subscribe", and manage the automatic subscription service. If you need to cancel, you can turn off the service 24 hours before the end of each billing cycle, and no fees will be deducted within 24 hours before the expiration 6. Privacy Policy: https://ttalkai.com/api/privacyPolicyIOS 7. User Agreement (EULA): https://ttalkai.com/api/userAgreementIOS
Screenshots
Verdict
The clearest difference is in-app purchases: PolyU GreenCoin at none against TalkAI's 10. TalkAI's advantage is ads (none vs shown) and update cadence (every 8 days vs every 3 months). On price, device support and iOS requirement 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. TalkAI sells 10 in-app purchases, starting at $17.99 per 7 days. PolyU GreenCoin asks for nothing beyond the download.
PolyU GreenCoin ships an update every 3 months, TalkAI every 8 days. The most recent releases landed on October 14, 2026 and November 3, 2026 respectively.
| Parameter | PolyU GreenCoin | TalkAI |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.8 (2.4K ratings) — better |
| Positive reviews | — | 92.9% of reviews |
| Number of ratings | — | 2.4K — better |
| Update frequency | Every 3 months | Every 8 days — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.1 — better | 16.0 |
| Further details — not scored | ||
| Size | 78 MB | 190 MB |
| Age rating | 4+ | 17+ |
| Developer | The Hong Kong Polytechnic University | Shenzhen Xiaojingtan Technology Company Limited |
Bugs and requests
PolyU GreenCoin
Not enough reviews yet to summarise bugs or requests.
TalkAI
Reported bugs
2 issues- Language feedback sometimes in wrong language
- App crashes or becomes unresponsive
Requested features
3 requests- Option to customize language feedback language
- Expand language support to more languages
- Improve app stability and reduce technical issues
In-app purchases
PolyU GreenCoin
No in-app purchases
TalkAI
- 口语练习7天会员$17.997 Days
- 月度会员$22.001 Month
- Monthly Plan$28.991 Month
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- Quarterly Plan$38.993 Months
- 口语练习季度会员$40.003 Months
- 口语练习年度会员$68.001 Year
- Yearly Plan$68.991 Year
- TalkAI练口语3年会员$89.99
- TalkAI练口语终身会员$99.99
- TalkAI终身会员$117.99









