Comparison

PolyU GreenCoin vs TalkAI

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

PolyU GreenCoin

Features
Read full description

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!

About

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.

Highlights
  • 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
Features
Read full description

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

PolyU GreenCoin4 screens
TalkAI4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
PolyU GreenCoin versus TalkAI: the parameters behind the verdict, then further details
ParameterPolyU GreenCoinTalkAI
PriceFreeFree
Rating—4.8 (2.4K ratings) — better
Positive reviews—92.9% of reviews
Number of ratings—2.4K — better
Update frequencyEvery 3 monthsEvery 8 days — better
AdsYesNo — better
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.1 — better16.0
Further details — not scored
Size78 MB190 MB
Age rating4+17+
DeveloperThe Hong Kong Polytechnic UniversityShenzhen 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

None

PolyU GreenCoin

No in-app purchases

10 purchases

TalkAI

Subscriptions7
  • 口语练习7天会员$17.997 Days
  • 月度会员$22.001 Month
  • Monthly Plan$28.991 Month
Show 4 more
  • 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
One-time3
  • 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

Questions

Is PolyU GreenCoin free?
PolyU GreenCoin is free to download, with no in-app purchases.
Is TalkAI free?
TalkAI is free to download, with in-app purchases available.
Do PolyU GreenCoin or TalkAI have ads?
PolyU GreenCoin shows ads; TalkAI does not.
Which is updated more often, PolyU GreenCoin or TalkAI?
PolyU GreenCoin ships an update every 3 months, and TalkAI every 8 days. Most recently, PolyU GreenCoin was updated on October 14, 2026 and TalkAI on November 3, 2026.

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