# 公采签 vs 石化招采

The clearest difference is iOS requirement: 石化招采 at 10.0 against 公采签's 13.0. 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.

Both ship on a similar rhythm, roughly every 2 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | 公采签 | 石化招采 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 67 MB | 95 MB |
| Requires iOS | 13.0 | **10.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [博思数采科技发展有限公司](https://appshunter.io/developer/1572784944) | [China Petrochemical Corporation](https://appshunter.io/developer/1404188289) |

## What reviewers say

### 公采签

[App page](https://appshunter.io/ios/app/id1634177211)

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

**In-app purchases:** none


### 石化招采

[App page](https://appshunter.io/ios/app/id6444849755)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 公采签 free?

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

### Is 石化招采 free?

石化招采 is free to download, with no in-app purchases.

### Do 公采签 or 石化招采 have ads?

Neither 公采签 nor 石化招采 shows ads.

### Which is updated more often, 公采签 or 石化招采?

公采签 ships an update every 2 months, and 石化招采 every 2 months. Most recently, 公采签 was updated on November 3, 2026 and 石化招采 on November 3, 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.*