# Gapfy Echo vs Knockbox

The clearest difference is update cadence: Knockbox at daily against Gapfy Echo's every 2 weeks. Gapfy Echo's advantage is device support (4 vs 2) and iOS requirement (15.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Gapfy Echo ships an update every 2 weeks, Knockbox daily. The most recent releases landed on October 31, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Gapfy Echo | Knockbox |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Daily** |
| Size | 100 MB | 7 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [GAPFY UNIPESSOAL LDA](https://appshunter.io/developer/1291730326) | [苗 苗](https://appshunter.io/developer/6791624017) |

## What reviewers say

### Gapfy Echo

[App page](https://appshunter.io/ios/app/gapfy-echo/id6794438322)

**Features:** Vision Pro support

**In-app purchases:** none


### Knockbox

[App page](https://appshunter.io/ios/app/knockbox-self-hosted-push/id6811317906)

**In-app purchases:** none


## Frequently asked questions

### Is Gapfy Echo free?

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

### Is Knockbox free?

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

### Do Gapfy Echo or Knockbox have ads?

Neither Gapfy Echo nor Knockbox shows ads.

### Which is updated more often, Gapfy Echo or Knockbox?

Gapfy Echo ships an update every 2 weeks, and Knockbox daily. Most recently, Gapfy Echo was updated on October 31, 2026 and Knockbox on November 6, 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.*