# BioSigner vs CNB Rates

The clearest difference is in-app purchases: BioSigner at none against CNB Rates's 1. BioSigner also leads on update cadence (every 2 months vs every 35 months) and iOS requirement (8.0 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. CNB Rates sells 1 one-off in-app purchase. BioSigner asks for nothing beyond the download.

BioSigner ships an update every 2 months, CNB Rates every 35 months. The most recent releases landed on October 5, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | BioSigner | CNB Rates |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 35 months |
| Monetization | — | Free |
| Size | 16 MB | 3 MB |
| Requires iOS | **8.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Factum Identity Solutions SL](https://appshunter.io/developer/1628978172) | [Martin Stanek](https://appshunter.io/developer/955316341) |

## What reviewers say

### BioSigner

[App page](https://appshunter.io/ios/app/biosigner/id603100641)

**Features:** macOS Compatibility

**In-app purchases:** none


### CNB Rates

[App page](https://appshunter.io/ios/app/cnb-rates/id963588673)

This app displays the current currency exchange rates as published by the Czech National Bank. It provides up-to-date information on foreign currency values for users interested in financial markets.

**Highlights:** Current currency exchange rates, Czech National Bank data, Foreign currency values, Up-to-date financial information

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Features | $0.99 | one-time |


## Frequently asked questions

### Is BioSigner free?

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

### Is CNB Rates free?

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

### Do BioSigner or CNB Rates have ads?

Neither BioSigner nor CNB Rates shows ads.

### Which is updated more often, BioSigner or CNB Rates?

BioSigner ships an update every 2 months, and CNB Rates every 35 months. Most recently, BioSigner was updated on October 5, 2026 and CNB Rates on October 11, 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.*