# 石油标准 vs 墨库

The clearest difference is update cadence: 墨库 at monthly against 石油标准's every 4 months. 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.

石油标准 ships an update every 4 months, 墨库 monthly. The most recent releases landed on September 18, 2026 and December 23, 2025 respectively.

## The numbers

| Metric | 石油标准 | 墨库 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 14.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Size | 37 MB | 167 MB |
| Requires iOS | 12.1 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [石油工业出版社](https://appshunter.io/developer/1019225064) | [中华商务贸易公司](https://appshunter.io/developer/1512128906) |

## What reviewers say

### 石油标准

[App page](https://appshunter.io/ios/app/id1491424663)

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

**In-app purchases:** none


### 墨库

[App page](https://appshunter.io/ios/app/id1550737280)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 石油标准 free?

石油标准 is free to download, with no in-app purchases.

### Is 墨库 free?

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

### Do 石油标准 or 墨库 have ads?

Neither 石油标准 nor 墨库 shows ads.

### Which is updated more often, 石油标准 or 墨库?

石油标准 ships an update every 4 months, and 墨库 monthly. Most recently, 石油标准 was updated on September 18, 2026 and 墨库 on December 23, 2025.

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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.*