# 石油标准 vs Readora

The clearest difference is in-app purchases: 石油标准 at none against Readora's 1. 石油标准 also leads on iOS requirement (12.1 vs 17.0). Readora's advantage is review sentiment (64% vs 30%) and update cadence (every 5 days vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Readora sells 1 one-off in-app purchase. 石油标准 asks for nothing beyond the download.

石油标准 ships an update every 4 months, Readora every 5 days. The most recent releases landed on November 3, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | 石油标准 | Readora |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (5 ratings)](https://appshunter.io/ios/app/readora-epub-ebook-reader/id6821266924/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | 30.0% of reviews | **63.6% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 days** |
| Monetization | — | Freemium |
| Size | 37 MB | 37 MB |
| Requires iOS | **12.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [石油工业出版社](https://appshunter.io/developer/1019225064) | [澄娜 余](https://appshunter.io/developer/6812849184) |

## 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


### Readora

[App page](https://appshunter.io/ios/app/readora-epub-ebook-reader/id6821266924)

Organize your personal ebook library, highlight favorite passages, and track your reading progress. Listen to books with text-to-speech and sync your data across devices. Unlock unlimited features with a one-time purchase.

**Highlights:** Import EPUB, PDF, TXT, MOBI, Organize library into categories, Highlight text and add notes, Track reading time and progress, Text-to-speech functionality, iCloud sync across Apple devices, Home screen widgets

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Permanent | $4.99 | one-time |


## Frequently asked questions

### Is 石油标准 free?

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

### Is Readora free?

Readora is free to download, with in-app purchases available.

### Do 石油标准 or Readora have ads?

Neither 石油标准 nor Readora shows ads.

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

石油标准 ships an update every 4 months, and Readora every 5 days. Most recently, 石油标准 was updated on November 3, 2026 and Readora on November 6, 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.*