# 建标库HD vs Ebook Formats Converter

The clearest difference is in-app purchases: 建标库HD at none against Ebook Formats Converter's 3. 建标库HD also leads on iOS requirement (8.0 vs 12.0). Ebook Formats Converter's advantage is device support (3 vs 1). On price, update cadence and ads there is nothing between them.

Both are free to download. Ebook Formats Converter sells 3 in-app purchases, starting at $2.99 per month. 建标库HD asks for nothing beyond the download.

建标库HD ships an update every 7 months, Ebook Formats Converter every 4 months. The most recent releases landed on October 12, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | 建标库HD | Ebook Formats Converter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hd/id589314959/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 91.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 4 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 29 MB | 52 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Luoyang Jianbiao Library Network Technology Co., Ltd.](https://appshunter.io/developer/1460554486) | [Meitian Trading](https://appshunter.io/developer/1549616114) |

## What reviewers say

### 建标库HD

[App page](https://appshunter.io/ios/app/hd/id589314959)

Access a comprehensive collection of architectural standards, regulations, and technical resources. This platform offers a community for industry professionals to exchange knowledge and stay updated on the latest building codes and practices.

**Highlights:** Extensive building standards and regulations, Large collection of architectural resources, Technical exchange community, Updated national and industry standards, Improved display and browsing experience, Update reminders and convenient downloads

**Features:** macOS Compatibility

**In-app purchases:** none


### Ebook Formats Converter

[App page](https://appshunter.io/ios/app/ebook-formats-converter/id6446448731)

Easily convert ebooks between numerous formats like EPUB, MOBI, and PDF. Organize your library by editing metadata and access past conversions. Download or export files in batches with a user-friendly interface.

**Highlights:** Multiple ebook format conversion, Metadata editing, Conversion history, Batch download and export, User-friendly interface

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP月会员 | $2.99 | per month |
| VIP季会员 | $4.99 | per 3 months |
| VIP年会员 | $7.99 | per year |


## Frequently asked questions

### Is 建标库HD free?

建标库HD is free to download, with no in-app purchases.

### Is Ebook Formats Converter free?

Ebook Formats Converter is free to download, with in-app purchases available.

### Do 建标库HD or Ebook Formats Converter have ads?

Neither 建标库HD nor Ebook Formats Converter shows ads.

### Which is updated more often, 建标库HD or Ebook Formats Converter?

建标库HD ships an update every 7 months, and Ebook Formats Converter every 4 months. Most recently, 建标库HD was updated on October 12, 2026 and Ebook Formats Converter on October 8, 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.*