# Kinnu vs How {Things} Work

The clearest difference is in-app purchases: How {Things} Work at none against Kinnu's 4. How {Things} Work also leads on iOS requirement (15.1 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Kinnu sells 4 in-app purchases, starting at $1.99 per month. How {Things} Work asks for nothing beyond the download.

## The numbers

| Metric | Kinnu | How {Things} Work |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (494 ratings)](https://appshunter.io/ios/app/kinnu-general-knowledge/id1625333066/reviews)** | — |
| Number of ratings | **494** | — |
| Positive reviews | 87.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 days | — |
| Monetization | Free with in-app purchases | — |
| Size | 101 MB | 41 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Kinnu Limited](https://appshunter.io/developer/1625333068) | [ccburns.me](https://appshunter.io/developer/444074938) |

## What reviewers say

### Kinnu

[App page](https://appshunter.io/ios/app/kinnu-general-knowledge/id1625333066)

This app offers bite-sized learning content across a wide range of subjects, from psychology and science to history and technology. It utilizes cognitive science and a unique "Memory Shield" technology to help users retain information effectively, making learning engaging and fun.

**Highlights:** Bite-sized, expert-edited content, Memory Shield technology for retention, Gamified learning sessions, Community-driven content development, Knowledge Bank progress tracking, Interactive, adaptive questions, Audio versions of content

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Kinnu Certificate | $7.99 | one-time |
| Kinnu Certificate | $14.99 | one-time |
| Kinnu Certificate | $19.99 | one-time |

**What reviewers like**

- 👍 Engaging learning experience
- 🚀 Efficient micro-learning format
- 🔒 No ads or subscriptions
- 💡 Wide range of interesting topics
- 👍 Gamified learning approach

**What reviewers complain about**

- 🐛 Occasional bugs and crashes
- 🐛 Syncing and progress issues
- 🐛 Inaccurate or incomplete information
- 🐛 AI-generated content quality concerns
- 🐛 Inability to contact developers

**Reported bugs**

- Frequent app crashes
- Progress and data loss issues
- Syncing problems
- Compatibility issues with older devices

**Requested features**

- Ability to highlight or take notes
- More in-depth content and sources
- Customization options (e.g., dark mode)
- Ability to connect with others
- Improved notification and reminder system


### How {Things} Work

[App page](https://appshunter.io/ios/app/how-things-work/id6767944916)

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

**In-app purchases:** none


## Frequently asked questions

### Is Kinnu free?

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

### Is How {Things} Work free?

How {Things} Work is free to download, with no in-app purchases.

### Do Kinnu or How {Things} Work have ads?

Neither Kinnu nor How {Things} Work shows ads.

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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.*