# 掌上大学 vs IDB

The clearest difference is update cadence: 掌上大学 at weekly against IDB's every 3 weeks. IDB's advantage is iOS requirement (12.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

掌上大学 ships an update weekly, IDB every 3 weeks. The most recent releases landed on October 24, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | 掌上大学 | IDB |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (6 ratings)](https://appshunter.io/ios/app/id1422981300/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 97.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Size | 186 MB | 24 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Hangzhou Xin Mai Technology Co., Ltd.](https://appshunter.io/developer/1013683591) | [catguanjia](https://appshunter.io/developer/1750852676) |

## What reviewers say

### 掌上大学

[App page](https://appshunter.io/ios/app/id1422981300)

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

**In-app purchases:** none


### IDB

[App page](https://appshunter.io/ios/app/idb/id6677011986)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 掌上大学 free?

掌上大学 is free to download, with no in-app purchases.

### Is IDB free?

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

### Do 掌上大学 or IDB have ads?

Neither 掌上大学 nor IDB shows ads.

### Which is updated more often, 掌上大学 or IDB?

掌上大学 ships an update weekly, and IDB every 3 weeks. Most recently, 掌上大学 was updated on October 24, 2026 and IDB on October 5, 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.*