# 中煤易签 vs 石化招采

The clearest difference is update cadence: 石化招采 at every 2 months against 中煤易签's every 8 months. 石化招采 also leads on iOS requirement (10.0 vs 13.0). 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.

中煤易签 ships an update every 8 months, 石化招采 every 2 months. The most recent releases landed on September 19, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | 中煤易签 | 石化招采 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 months** |
| Size | 28 MB | 95 MB |
| Requires iOS | 13.0 | **10.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shanghai Electronic Certificate Authority Center Co.,LTD](https://appshunter.io/developer/924307388) | [China Petrochemical Corporation](https://appshunter.io/developer/1404188289) |

## What reviewers say

### 中煤易签

[App page](https://appshunter.io/ios/app/id1638677637)

**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 中煤易签 free?

中煤易签 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 中煤易签 or 石化招采 have ads?

Neither 中煤易签 nor 石化招采 shows ads.

### Which is updated more often, 中煤易签 or 石化招采?

中煤易签 ships an update every 8 months, and 石化招采 every 2 months. Most recently, 中煤易签 was updated on September 19, 2026 and 石化招采 on October 27, 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.*