# Knock, knock, knock! vs Polyglutt

The clearest difference is price: Polyglutt at Free against Knock, knock, knock!'s $2.99. Polyglutt also leads on update cadence (every 3 weeks vs every 48 months). Knock, knock, knock!'s advantage is iOS requirement (9.3 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

Polyglutt is free to download; Knock, knock, knock! costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Knock, knock, knock! ships an update every 48 months, Polyglutt every 3 weeks. The most recent releases landed on October 8, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Knock, knock, knock! | Polyglutt |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/polyglutt/id1277042294/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 48 months | **Every 3 weeks** |
| Monetization | **Paid** | Subscription |
| Size | 121 MB | 52 MB |
| Requires iOS | **9.3** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alfabeta](https://appshunter.io/developer/586381859) | [ILT Inläsningstjänst AB](https://appshunter.io/developer/1277042293) |

## What reviewers say

### Knock, knock, knock!

[App page](https://appshunter.io/ios/app/knock-knock-knock/id586381856)

This interactive book app brings a classic children's story to life with engaging page-turning and the ability to record your own narration. It's designed for young children to enjoy a beloved tale in a new digital format.

**Highlights:** Interactive page turning, Recordable narration, Multiple language options, Classic children's story, Designed for toddlers

**In-app purchases:** none


### Polyglutt

[App page](https://appshunter.io/ios/app/polyglutt/id1277042294)

A digital library offering narrated and browsable children's books for preschool. Features books in over 70 languages, including sign language and audio descriptions, with pedagogical support for language development.

**Highlights:** Digital library of children's books, Narrated and browsable content, Books in over 70 languages, Sign language and audio descriptions, Pedagogical support for language development, Discussion questions and key vocabulary

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Knock, knock, knock! free?

Knock, knock, knock! costs $2.99, with no in-app purchases.

### Is Polyglutt free?

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

### Do Knock, knock, knock! or Polyglutt have ads?

Neither Knock, knock, knock! nor Polyglutt shows ads.

### Which is updated more often, Knock, knock, knock! or Polyglutt?

Knock, knock, knock! ships an update every 48 months, and Polyglutt every 3 weeks. Most recently, Knock, knock, knock! was updated on October 8, 2026 and Polyglutt on October 7, 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.*