# 识堂 vs BrainOpen

The clearest difference is in-app purchases: 识堂 at none against BrainOpen's 1. 识堂 also leads on update cadence (fortnightly vs every 18 months) and iOS requirement (11.0 vs 13.0). On price, ads and device support there is nothing between them.

Both are free to download. BrainOpen sells 1 in-app purchase, starting at $3.99 per month. 识堂 asks for nothing beyond the download.

识堂 ships an update fortnightly, BrainOpen every 18 months. The most recent releases landed on October 13, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | 识堂 | BrainOpen |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 18 months |
| Size | 293 MB | 113 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Beijing EverHub Technology Co., Ltd.](https://appshunter.io/developer/1605760128) | [鞯 赵](https://appshunter.io/developer/1567856103) |

## What reviewers say

### 识堂

[App page](https://appshunter.io/ios/app/id1605760126)

**Features:** macOS Compatibility

**In-app purchases:** none


### BrainOpen

[App page](https://appshunter.io/ios/app/brainopen/id1624322578)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP Monthly Card-Unlimited Chat | $3.99 | per month |


## Frequently asked questions

### Is 识堂 free?

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

### Is BrainOpen free?

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

### Do 识堂 or BrainOpen have ads?

Neither 识堂 nor BrainOpen shows ads.

### Which is updated more often, 识堂 or BrainOpen?

识堂 ships an update fortnightly, and BrainOpen every 18 months. Most recently, 识堂 was updated on October 13, 2026 and BrainOpen on October 18, 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.*