# 建标库HD vs PDF Reader

The clearest difference is in-app purchases: 建标库HD at none against PDF Reader's 5. 建标库HD also leads on iOS requirement (8.0 vs 12.0). PDF Reader's advantage is update cadence (every 3 weeks vs every 7 months) and ratings volume (8 vs 1). On price, rating and ads there is nothing between them.

Both are free to download. PDF Reader sells 5 one-off in-app purchases. 建标库HD asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for 建标库HD against 4.9 for PDF Reader. That said, the two scores are not equally well evidenced: PDF Reader has 8 ratings behind it against 1, so its average is the more settled of the two.

建标库HD ships an update every 7 months, PDF Reader every 3 weeks. The most recent releases landed on September 9, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | 建标库HD | PDF Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hd/id589314959/reviews)** | [4.9 (8 ratings)](https://appshunter.io/ios/app/pdf-reader-mini-version/id898564035/reviews) |
| Number of ratings | 1 | **8** |
| Positive reviews | — | 71.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 29 MB | 50 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) | [绪强 任](https://appshunter.io/developer/898564038) |

## 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


### PDF Reader

[App page](https://appshunter.io/ios/app/pdf-reader-mini-version/id898564035)

This app allows you to read various document formats like PDF, EPUB, and CHM on your iPhone and iPad. It supports file import, text search, annotation, and even previewing MS Office files and videos. A simple to-do list and auto-save reading progress are also included.

**Highlights:** Reads PDF, CHM, EPUB, TXT files, PDF annotation and text search, File import via Files, Airdrop, iTunes, web, MS Office and video file preview, Simple To-Do list functionality, Auto-save reading progress

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reader App donate | $0.99 | one-time |
| Dropbox Support | $0.99 | one-time |
| Remove Ad | $4.99 | one-time |
| Todo donate | $7.99 | one-time |
| Todo donate | $14.99 | one-time |


## Frequently asked questions

### Is 建标库HD free?

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

### Is PDF Reader free?

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

### Which has better reviews, 建标库HD or PDF Reader?

建标库HD is rated higher. 建标库HD averages 5.0 out of 5 from 1 ratings, while PDF Reader averages 4.9 from 8 ratings.

### Do 建标库HD or PDF Reader have ads?

Neither 建标库HD nor PDF Reader shows ads.

### Which is updated more often, 建标库HD or PDF Reader?

建标库HD ships an update every 7 months, and PDF Reader every 3 weeks. Most recently, 建标库HD was updated on September 9, 2026 and PDF Reader on September 25, 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.*