# Biodiversiteit App vs FlexApp Katwijk

The clearest difference is update cadence: Biodiversiteit App at every 3 months against FlexApp Katwijk's every 19 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Biodiversiteit App ships an update every 3 months, FlexApp Katwijk every 19 months. The most recent releases landed on October 2, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Biodiversiteit App | FlexApp Katwijk |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 19 months |
| Size | 58 MB | 37 MB |
| Requires iOS | **10.0** | 11.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [iASSET B.V.](https://appshunter.io/developer/795372329) | [Approxx B.V.](https://appshunter.io/developer/1340312349) |

## What reviewers say

### Biodiversiteit App

[App page](https://appshunter.io/ios/app/biodiversiteit-app/id1488320276)

**In-app purchases:** none


### FlexApp Katwijk

[App page](https://appshunter.io/ios/app/flexapp-katwijk/id1588364368)

**In-app purchases:** none


## Frequently asked questions

### Is Biodiversiteit App free?

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

### Is FlexApp Katwijk free?

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

### Do Biodiversiteit App or FlexApp Katwijk have ads?

Neither Biodiversiteit App nor FlexApp Katwijk shows ads.

### Which is updated more often, Biodiversiteit App or FlexApp Katwijk?

Biodiversiteit App ships an update every 3 months, and FlexApp Katwijk every 19 months. Most recently, Biodiversiteit App was updated on October 2, 2026 and FlexApp Katwijk on October 9, 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.*