# check vs BioFlash

The clearest difference is in-app purchases: check at none against BioFlash's 1. check also leads on update cadence (every 9 days vs every 7 months) and iOS requirement (8.0 vs 16.4). On price, ads and device support there is nothing between them.

Both are free to download. BioFlash sells 1 in-app purchase, starting at $9.99 per year. check asks for nothing beyond the download.

check ships an update every 9 days, BioFlash every 7 months. The most recent releases landed on October 10, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | check | BioFlash |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 7 months |
| Size | 23 MB | 44 MB |
| Requires iOS | **8.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Smart Bits GmbH](https://appshunter.io/developer/1218214060) | [Gentiana Etemi](https://appshunter.io/developer/1883027493) |

## What reviewers say

### check

[App page](https://appshunter.io/ios/app/check-app-new/id1275901663)

**Features:** macOS Compatibility

**In-app purchases:** none


### BioFlash

[App page](https://appshunter.io/ios/app/bioflash-glossary/id6760253478)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BioFlash Premium | $9.99 | per year |


## Frequently asked questions

### Is check free?

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

### Is BioFlash free?

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

### Do check or BioFlash have ads?

Neither check nor BioFlash shows ads.

### Which is updated more often, check or BioFlash?

check ships an update every 9 days, and BioFlash every 7 months. Most recently, check was updated on October 10, 2026 and BioFlash on October 24, 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.*