# 信手书 vs 石化招采

信手书 and 石化招采 are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. The most recent releases landed on September 18, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | 信手书 | 石化招采 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 54 MB | 95 MB |
| Requires iOS | 11 | **10.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Beijing Certificate Authority Co., Ltd.](https://appshunter.io/developer/1074200787) | [China Petrochemical Corporation](https://appshunter.io/developer/1404188289) |

## What reviewers say

### 信手书

[App page](https://appshunter.io/ios/app/id1380101522)

**Features:** macOS Compatibility

**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 信手书 free?

信手书 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 信手书 or 石化招采 have ads?

Neither 信手书 nor 石化招采 shows ads.

### Which is updated more often, 信手书 or 石化招采?

信手书 ships an update every 2 months, and 石化招采 every 2 months. Most recently, 信手书 was updated on September 18, 2026 and 石化招采 on September 15, 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.*