# Knockdog vs Diffu

The clearest difference is in-app purchases: Knockdog at none against Diffu's 6. Knockdog also leads on ads (none vs shown). Diffu's advantage is update cadence (every 2 weeks vs every 3 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Diffu sells 6 in-app purchases, starting at $2.99 per month. Knockdog asks for nothing beyond the download.

Knockdog ships an update every 3 months, Diffu every 2 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Knockdog | Diffu |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Size | 35 MB | 73 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [eunhee gwak](https://appshunter.io/developer/1744130117) | [Jeong-Hwan Jang](https://appshunter.io/developer/1880755654) |

## What reviewers say

### Knockdog

[App page](https://appshunter.io/ios/app/knockdog/id6754978978)

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

**In-app purchases:** none


### Diffu

[App page](https://appshunter.io/ios/app/diffu-something-to-say/id6759802088)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Diffu Premium | $2.99 | per month |
| Diffu Premium | $29.99 | per year |
| 100 엠버 | $0.49 | one-time |
| 500 엠버 | $2.99 | one-time |
| 1000 엠버 | $6.99 | one-time |
| 3000 엠버 | $19.99 | one-time |


## Frequently asked questions

### Is Knockdog free?

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

### Is Diffu free?

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

### Do Knockdog or Diffu have ads?

Diffu shows ads; Knockdog does not.

### Which is updated more often, Knockdog or Diffu?

Knockdog ships an update every 3 months, and Diffu every 2 weeks. Most recently, Knockdog was updated on October 25, 2026 and Diffu on October 24, 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.*