# 青于蓝 vs QuestionBank

The clearest difference is in-app purchases: 青于蓝 at none against QuestionBank's 8. 青于蓝 also leads on ads (none vs shown) and review sentiment (45% vs 15%). On price, device support and iOS requirement there is nothing between them.

Both are free to download. QuestionBank sells 8 in-app purchases, starting at $0.99 per 7 days. 青于蓝 asks for nothing beyond the download.

青于蓝 ships an update every 3 weeks, QuestionBank every 2 months. The most recent releases landed on September 10, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | 青于蓝 | QuestionBank |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.7 (6 ratings)](https://appshunter.io/ios/app/questionbank/id1634579310/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | **45.0% of reviews** | 15.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | — | Free with in-app purchases |
| Size | 129 MB | 65 MB |
| Requires iOS | **13.0** | 13.3 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [Beijing Home Call Express Data Technology Co., Ltd.](https://appshunter.io/developer/990703582) | [Foshan Fullstack Technology](https://appshunter.io/developer/1575723135) |

## What reviewers say

### 青于蓝

[App page](https://appshunter.io/ios/app/id1404817237)

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

**In-app purchases:** none


### QuestionBank

[App page](https://appshunter.io/ios/app/questionbank/id1634579310)

Effortlessly solve academic questions by taking a photo. AI-powered recognition handles complex formulas and symbols, providing quick answers. Offers various subscription plans for continuous learning support.

**Highlights:** Photo recognition of questions, AI intelligent search, Special symbol recognition (math formulas), Quick problem-solving, Continuous membership subscriptions, Multiple subscription plans

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 周会员 | $0.99 | per 7 days |
| 周会员 | $0.99 | per 7 days |
| 周会员 | $0.99 | per 7 days |
| 月度会员 | $2.99 | per month |
| 连续包月会员 | $2.99 | per month |
| 年度会员 | $9.99 | per year |
| 连续包年会员 | $14.99 | per year |
| 一次性买断 | $49.99 | one-time |


## Frequently asked questions

### Is 青于蓝 free?

青于蓝 is free to download, with no in-app purchases.

### Is QuestionBank free?

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

### Do 青于蓝 or QuestionBank have ads?

QuestionBank shows ads; 青于蓝 does not.

### Which is updated more often, 青于蓝 or QuestionBank?

青于蓝 ships an update every 3 weeks, and QuestionBank every 2 months. Most recently, 青于蓝 was updated on September 10, 2026 and QuestionBank on September 23, 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.*