# nRF Blinky vs KFEI CSViewer

The clearest difference is update cadence: KFEI CSViewer at every 5 days against nRF Blinky's every 9 months. nRF Blinky's advantage is device support (4 vs 2) and iOS requirement (12.0 vs 17.6). On price, ads and in-app purchases there is nothing between them.

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

nRF Blinky ships an update every 9 months, KFEI CSViewer every 5 days. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | nRF Blinky | KFEI CSViewer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 5 days** |
| Size | 10 MB | 3 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nordic Semiconductor ASA](https://appshunter.io/developer/497679114) | [KAGA FEI Co., Ltd.](https://appshunter.io/developer/1635192113) |

## What reviewers say

### nRF Blinky

[App page](https://appshunter.io/ios/app/nrf-blinky/id1325014347)

**In-app purchases:** none


### KFEI CSViewer

[App page](https://appshunter.io/ios/app/kfei-csviewer/id6771185904)

**In-app purchases:** none


## Frequently asked questions

### Is nRF Blinky free?

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

### Is KFEI CSViewer free?

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

### Do nRF Blinky or KFEI CSViewer have ads?

Neither nRF Blinky nor KFEI CSViewer shows ads.

### Which is updated more often, nRF Blinky or KFEI CSViewer?

nRF Blinky ships an update every 9 months, and KFEI CSViewer every 5 days. Most recently, nRF Blinky was updated on November 4, 2026 and KFEI CSViewer on October 31, 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.*