# Knock AI vs 51Talk AI Tutor

The clearest difference is iOS requirement: 51Talk AI Tutor at 13 against Knock AI's 15.0. On price, update cadence, 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.

Knock AI ships an update fortnightly, 51Talk AI Tutor every 3 weeks. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Knock AI | 51Talk AI Tutor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/knock-ai/id6504226345/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Free | — |
| Size | 47 MB | 630 MB |
| Requires iOS | 15.0 | **13** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [上海启扉绘梦智能科技有限公司](https://appshunter.io/developer/1751439886) | [大生在线(深圳)文化传媒科技有限公司](https://appshunter.io/developer/1702645479) |

## What reviewers say

### Knock AI

[App page](https://appshunter.io/ios/app/knock-ai/id6504226345)

This AI-powered platform helps parents and children create personalized stories, picture books, and nursery rhymes. Users can choose themes and age tags to generate unique content, fostering creativity and documenting a child's growth journey.

**Highlights:** AI story and picture book generation, AI nursery rhyme creation, Customizable themes and age tags, Free library of stories and rhymes, Story collection for child's growth

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

**In-app purchases:** none


### 51Talk AI Tutor

[App page](https://appshunter.io/ios/app/51talk-ai-tutor/id6746630278)

**In-app purchases:** none


## Frequently asked questions

### Is Knock AI free?

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

### Is 51Talk AI Tutor free?

51Talk AI Tutor is free to download, with no in-app purchases.

### Do Knock AI or 51Talk AI Tutor have ads?

Neither Knock AI nor 51Talk AI Tutor shows ads.

### Which is updated more often, Knock AI or 51Talk AI Tutor?

Knock AI ships an update fortnightly, and 51Talk AI Tutor every 3 weeks. Most recently, Knock AI was updated on November 4, 2026 and 51Talk AI Tutor on October 30, 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.*