# 建标库HD vs CHM+

The clearest difference is rating: 建标库HD at 5.0 against CHM+'s 3.0. 建标库HD also leads on in-app purchases (none vs 1) and ads (none vs shown). CHM+'s advantage is update cadence (every 6 weeks vs every 7 months) and device support (3 vs 1). On price and ratings volume there is nothing between them.

Both are free to download. CHM+ sells 1 one-off in-app purchase. 建标库HD asks for nothing beyond the download.

建标库HD holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

建标库HD ships an update every 7 months, CHM+ every 6 weeks. The most recent releases landed on September 9, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | 建标库HD | CHM+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hd/id589314959/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/chm-plus-chm-document-reader/id6745147168/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | — | 83.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Every 6 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 29 MB | 16 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Luoyang Jianbiao Library Network Technology Co., Ltd.](https://appshunter.io/developer/1460554486) | [俊锋 仝](https://appshunter.io/developer/1209824000) |

## 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+

[App page](https://appshunter.io/ios/app/chm-plus-chm-document-reader/id6745147168)

This app provides a streamlined way to read CHM documents on iOS devices. It offers quick import from local storage and iCloud, fast opening of large files, and efficient chapter navigation. Enjoy a smooth reading experience with support for multiple encodings.

**Highlights:** Quick document import (local storage, iCloud), Fast opening of large CHM files, Table of contents chapter switching, Multi-screen collaboration on iPad, Support for multiple encoding types, Smooth reading experience

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CHM Pro | $4.99 | 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+ free?

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

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

建标库HD is rated higher. 建标库HD averages 5.0 out of 5 from 1 ratings, while CHM+ averages 3.0 from 2 ratings.

### Do 建标库HD or CHM+ have ads?

CHM+ shows ads; 建标库HD does not.

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

建标库HD ships an update every 7 months, and CHM+ every 6 weeks. Most recently, 建标库HD was updated on September 9, 2026 and CHM+ on September 26, 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.*