# KnowledgeBase Builder vs TheFlex

The clearest difference is price: TheFlex at Free against KnowledgeBase Builder's $8.99. TheFlex also leads on iOS requirement (13.0 vs 15.0). KnowledgeBase Builder's advantage is in-app purchases (none vs 2) and update cadence (fortnightly vs every 6 months). On ads and device support there is nothing between them.

TheFlex is free to download; KnowledgeBase Builder costs $8.99 up front. TheFlex sells 2 in-app purchases, starting at $6.99 per month. KnowledgeBase Builder asks for nothing beyond the download.

KnowledgeBase Builder ships an update fortnightly, TheFlex every 6 months. The most recent releases landed on October 2, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | KnowledgeBase Builder | TheFlex |
| --- | --- | --- |
| 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** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 6 months |
| Monetization | Paid | — |
| Size | 21 MB | 14 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Ingo Straub](https://appshunter.io/developer/1398145160) | [Flexus AG](https://appshunter.io/developer/723422616) |

## 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:** Vision Pro support

**In-app purchases:** none


### TheFlex

[App page](https://appshunter.io/ios/app/theflex/id1621676862)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| License / Month | $6.99 | per month |
| License / Year | $68.99 | per year |


## Frequently asked questions

### Is KnowledgeBase Builder free?

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

### Is TheFlex free?

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

### Do KnowledgeBase Builder or TheFlex have ads?

Neither KnowledgeBase Builder nor TheFlex shows ads.

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

KnowledgeBase Builder ships an update fortnightly, and TheFlex every 6 months. Most recently, KnowledgeBase Builder was updated on October 2, 2026 and TheFlex on September 10, 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.*