# KnowledgeBase Builder vs iUsound

The clearest difference is price: iUsound at Free against KnowledgeBase Builder's $8.99. KnowledgeBase Builder's advantage is update cadence (fortnightly vs every 5 months) and iOS requirement (15.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

iUsound is free to download; KnowledgeBase Builder costs $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.

KnowledgeBase Builder ships an update fortnightly, iUsound every 5 months. The most recent releases landed on September 7, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | KnowledgeBase Builder | iUsound |
| --- | --- | --- |
| Price | $8.99 | **Free** |
| Rating | **[4.7 (24 ratings)](https://appshunter.io/ios/app/knowledgebase-builder/id1448579863/reviews)** | — |
| Number of ratings | **24** | — |
| Positive reviews | 90.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 months |
| Monetization | Paid | — |
| Size | 21 MB | 166 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Ingo Straub](https://appshunter.io/developer/1398145160) | [Aidmics Biotechnology Co., Ltd](https://appshunter.io/developer/1119461359) |

## What reviewers say

### KnowledgeBase Builder

[App page](https://appshunter.io/ios/app/knowledgebase-builder/id1448579863)

Organize and search text documents and web pages with links within a mind map structure. Automatically create mind maps from text, import Wikipedia articles, and export your knowledge base as HTML. Also functions as a flowcharting tool.

**Highlights:** Save text documents and web pages, Full-text search, Organize with mind maps, Automatic mind map creation, Wikipedia import, Export to HTML, Flowcharting tool

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

**In-app purchases:** none


### iUsound

[App page](https://appshunter.io/ios/app/iusound/id6739766502)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is KnowledgeBase Builder free?

KnowledgeBase Builder costs $8.99, with no in-app purchases.

### Is iUsound free?

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

### Do KnowledgeBase Builder or iUsound have ads?

Neither KnowledgeBase Builder nor iUsound shows ads.

### Which is updated more often, KnowledgeBase Builder or iUsound?

KnowledgeBase Builder ships an update fortnightly, and iUsound every 5 months. Most recently, KnowledgeBase Builder was updated on September 7, 2026 and iUsound on September 22, 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.*