# PolyU GreenCoin vs AskSia

The clearest difference is in-app purchases: PolyU GreenCoin at none against AskSia's 7. AskSia's advantage is ads (none vs shown) and update cadence (weekly vs every 3 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. AskSia sells 7 in-app purchases, starting at $5.99 per 7 days. PolyU GreenCoin asks for nothing beyond the download.

PolyU GreenCoin ships an update every 3 months, AskSia weekly. The most recent releases landed on October 14, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | PolyU GreenCoin | AskSia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.1 (64 ratings)](https://appshunter.io/ios/app/asksia-ai-tutor-and-study-notes/id6746232496/reviews)** |
| Number of ratings | — | **64** |
| Positive reviews | — | 83.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 78 MB | 61 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [The Hong Kong Polytechnic University](https://appshunter.io/developer/442903588) | [ASKSIA INC](https://appshunter.io/developer/1815883382) |

## What reviewers say

### PolyU GreenCoin

[App page](https://appshunter.io/ios/app/polyu-greencoin/id1455168482)

**Features:** macOS Compatibility

**In-app purchases:** none


### AskSia

[App page](https://appshunter.io/ios/app/asksia-ai-tutor-and-study-notes/id6746232496)

This AI-powered study tool helps students upload readings, transcribe lectures, ask questions, and organize notes. It offers a free tier with limited features and multiple premium subscription plans for enhanced capabilities and unlimited processing.

**Highlights:** Upload readings and documents, Transcribe lecture audio, Ask AI questions about content, Organize notes, Unlimited AI assistance (premium), Document processing (premium)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AskSia - A+ | $5.99 | per 7 days |
| AskSia - Plus | $14.99 | per month |
| AskSia - Super | $17.99 | per month |
| AskSia - A+ | $29.99 | per month |
| AskSia - Plus | $99.99 | per year |
| AskSia - Super | $143.99 | per year |
| AskSia - A+ | $155.99 | per year |


## Frequently asked questions

### Is PolyU GreenCoin free?

PolyU GreenCoin is free to download, with no in-app purchases.

### Is AskSia free?

AskSia is free to download, with in-app purchases available.

### Do PolyU GreenCoin or AskSia have ads?

PolyU GreenCoin shows ads; AskSia does not.

### Which is updated more often, PolyU GreenCoin or AskSia?

PolyU GreenCoin ships an update every 3 months, and AskSia weekly. Most recently, PolyU GreenCoin was updated on October 14, 2026 and AskSia on October 21, 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.*