# 建标库HD vs CHM Reader

The clearest difference is in-app purchases: 建标库HD at none against CHM Reader's 3. 建标库HD also leads on iOS requirement (8.0 vs 16). CHM Reader's advantage is update cadence (every 3 weeks vs every 7 months) and device support (3 vs 1). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. CHM Reader sells 3 in-app purchases, starting at $1.99 per 7 days. 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 5.0 for CHM Reader. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

建标库HD ships an update every 7 months, CHM Reader every 3 weeks. The most recent releases landed on October 12, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | 建标库HD | CHM Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/hd/id589314959/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/chm-reader-read-chm-txt/id6758199572/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | — | 42.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | **Free** | Freemium |
| Size | 29 MB | 19 MB |
| Requires iOS | **8.0** | 16 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Luoyang Jianbiao Library Network Technology Co., Ltd.](https://appshunter.io/developer/1460554486) | [灿耿 陈](https://appshunter.io/developer/1688324562) |

## 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


### CHM Reader

[App page](https://appshunter.io/ios/app/chm-reader-read-chm-txt/id6758199572)

This app provides a streamlined and efficient way to read CHM and TXT documents. It offers features like smart table of contents navigation, full-text search, adjustable font sizes, and night mode for a comfortable reading experience.

**Highlights:** Professional CHM format support, Smart Table of Contents navigation, Full-text search, Adjustable font size, Night mode, Bookmark collection

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly members | $1.99 | per 7 days |
| Annual Subscription | $4.99 | per year |
| Lifetime Membership | $6.99 | 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 CHM Reader free?

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

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

建标库HD and CHM Reader are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do 建标库HD or CHM Reader have ads?

Neither 建标库HD nor CHM Reader shows ads.

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

建标库HD ships an update every 7 months, and CHM Reader every 3 weeks. Most recently, 建标库HD was updated on October 12, 2026 and CHM Reader 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.*