# flateXSecure vs Kirchenmaus

The clearest difference is in-app purchases: flateXSecure at none against Kirchenmaus's 1. flateXSecure also leads on iOS requirement (12.0 vs 26.0). Kirchenmaus's advantage is update cadence (every 2 weeks vs every 5 months). On price, ads and device support there is nothing between them.

Both are free to download. Kirchenmaus sells 1 one-off in-app purchase. flateXSecure asks for nothing beyond the download.

flateXSecure ships an update every 5 months, Kirchenmaus every 2 weeks. The most recent releases landed on November 11, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | flateXSecure | Kirchenmaus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (85 ratings)](https://appshunter.io/ios/app/flatexsecure/id1174476178/reviews)** | — |
| Number of ratings | **85** | — |
| Positive reviews | 84.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 10 MB | 40 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [flatexDEGIRO SE](https://appshunter.io/developer/638392948) | [Daniil Auner](https://appshunter.io/developer/1886748630) |

## What reviewers say

### flateXSecure

[App page](https://appshunter.io/ios/app/flatexsecure/id1174476178)

Securely authorize transactions without an iTAN card. Receive TANs directly on your smartphone or tablet via the app. Get important notifications through push messages.

**Highlights:** Secure transaction authorization, iTAN card alternative, Receive TANs on smartphone/tablet, Push notifications, Choose authorization method

**In-app purchases:** none


### Kirchenmaus

[App page](https://appshunter.io/ios/app/kirchenmaus-self-employed-tax/id6797904033)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kirchenmaus Plus | $4.99 | one-time |


## Frequently asked questions

### Is flateXSecure free?

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

### Is Kirchenmaus free?

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

### Do flateXSecure or Kirchenmaus have ads?

Neither flateXSecure nor Kirchenmaus shows ads.

### Which is updated more often, flateXSecure or Kirchenmaus?

flateXSecure ships an update every 5 months, and Kirchenmaus every 2 weeks. Most recently, flateXSecure was updated on November 11, 2026 and Kirchenmaus on November 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.*