# 开思 vs 一体系

The clearest difference is iOS requirement: 开思 at 13.0 against 一体系's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

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

开思 ships an update weekly, 一体系 fortnightly. The most recent releases landed on September 24, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | 开思 | 一体系 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/id1291624924/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Fortnightly |
| Size | 157 MB | 129 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Casstime Technologies Co., Ltd.](https://appshunter.io/developer/1238561221) | [ETC Technology (Shanghai) Co., Ltd.](https://appshunter.io/developer/1570203428) |

## What reviewers say

### 开思

[App page](https://appshunter.io/ios/app/id1291624924)

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

**In-app purchases:** none


### 一体系

[App page](https://appshunter.io/ios/app/id1570591621)

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

**In-app purchases:** none


## Frequently asked questions

### Is 开思 free?

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

### Is 一体系 free?

一体系 is free to download, with no in-app purchases.

### Do 开思 or 一体系 have ads?

Neither 开思 nor 一体系 shows ads.

### Which is updated more often, 开思 or 一体系?

开思 ships an update weekly, and 一体系 fortnightly. Most recently, 开思 was updated on September 24, 2026 and 一体系 on September 20, 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.*