# ChatLink DUO vs KnocKnow

The clearest difference is in-app purchases: ChatLink DUO at none against KnocKnow's 2. ChatLink DUO also leads on ads (none vs shown) and device support (3 vs 1). KnocKnow's advantage is update cadence (every 3 weeks vs every 46 months). On price there is nothing between them.

Both are free to download. KnocKnow sells 2 in-app purchases, starting at $99.99 per month. ChatLink DUO asks for nothing beyond the download.

ChatLink DUO ships an update every 46 months, KnocKnow every 3 weeks. The most recent releases landed on September 25, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | ChatLink DUO | KnocKnow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/knocknow/id6748841288/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 46 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 61 MB | 42 MB |
| Requires iOS | **15.1** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 9+ | 4+ |
| Developer | [Dalton Utilities / OptiLink](https://appshunter.io/developer/1628633240) | [KnocKnow LLC](https://appshunter.io/developer/1827621168) |

## What reviewers say

### ChatLink DUO

[App page](https://appshunter.io/ios/app/chatlink-duo/id1628633238)

**Features:** macOS Compatibility

**In-app purchases:** none


### KnocKnow

[App page](https://appshunter.io/ios/app/knocknow/id6748841288)

This app analyzes property data to identify high-conversion doors for door-to-door sales. It helps users find the best areas to work by applying filters for property type, age, and ownership. Maximize your sales efforts by focusing on the most promising leads.

**Highlights:** Property data analysis, ZIP code and address search, Customizable property filters, Map-based zone highlighting, D2D sales route optimization, Data-backed sales decisions

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| KnocKnow | $99.99 | per month |
| KnocKnow | $899.00 | per year |


## Frequently asked questions

### Is ChatLink DUO free?

ChatLink DUO is free to download, with no in-app purchases.

### Is KnocKnow free?

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

### Do ChatLink DUO or KnocKnow have ads?

KnocKnow shows ads; ChatLink DUO does not.

### Which is updated more often, ChatLink DUO or KnocKnow?

ChatLink DUO ships an update every 46 months, and KnocKnow every 3 weeks. Most recently, ChatLink DUO was updated on September 25, 2026 and KnocKnow on October 2, 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.*