# CHM阅读器专业版 vs Authenticator App

The clearest difference is monetization model: Authenticator App at free with in-app purchases against CHM阅读器专业版's paid. CHM阅读器专业版's advantage is iOS requirement (15.6 vs 17.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. CHM阅读器专业版 sells 3 in-app purchases, starting at $1.99 per month and Authenticator App sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

CHM阅读器专业版 ships an update every 9 days, Authenticator App every 2 weeks. The most recent releases landed on October 2, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | CHM阅读器专业版 | Authenticator App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/authenticator-app-keyzy/id6748629429/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 2 weeks |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 7 MB | 7 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [宁伟 陈](https://appshunter.io/developer/1801975672) | [RETRYTECH LLP](https://appshunter.io/developer/1544420363) |

## What reviewers say

### CHM阅读器专业版

[App page](https://appshunter.io/ios/app/chm/id6746235244)

Easily view CHM files on your iPhone or iPad. This professional reader supports opening documents from various sources, offers quick navigation via table of contents, and includes full-text search. Enjoy comfortable reading with Dark Mode support.

**Highlights:** Open CHM files from Files, Mail, Safari, Automatic table of contents parsing, Full-text search, Dark Mode support, View help documents and tech manuals

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度会员 | $1.99 | per month |
| 年度会员 | $9.99 | per year |
| 永久会员 | $12.99 | one-time |


### Authenticator App

[App page](https://appshunter.io/ios/app/authenticator-app-keyzy/id6748629429)

This app generates secure, offline two-factor authentication codes for all your major online accounts. It offers iCloud sync for Apple devices and allows for easy organization and deletion of codes. Upgrade for unlimited accounts and advanced categorization.

**Highlights:** Supports major platforms (Google, Instagram, Facebook, GitHub), Import 2FA codes from screenshots, iCloud Sync across Apple devices, Organize codes into categories, Private and offline code storage, Generates TOTP codes securely

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $3.99 | per month |
| Yearly | $12.99 | per year |
| Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is CHM阅读器专业版 free?

CHM阅读器专业版 is free to download, with in-app purchases available.

### Is Authenticator App free?

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

### Do CHM阅读器专业版 or Authenticator App have ads?

Neither CHM阅读器专业版 nor Authenticator App shows ads.

### Which is updated more often, CHM阅读器专业版 or Authenticator App?

CHM阅读器专业版 ships an update every 9 days, and Authenticator App every 2 weeks. Most recently, CHM阅读器专业版 was updated on October 2, 2026 and Authenticator App on September 23, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*