# nRF Toolbox vs KFEI CSViewer

The clearest difference is update cadence: KFEI CSViewer at every 5 days against nRF Toolbox's every 5 weeks. 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.

nRF Toolbox ships an update every 5 weeks, KFEI CSViewer every 5 days. The most recent releases landed on October 20, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | nRF Toolbox | KFEI CSViewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.6 (8 ratings)](https://appshunter.io/ios/app/nrf-toolbox/id820906058/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 22.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 5 days** |
| Monetization | Free | — |
| Size | 9 MB | 3 MB |
| Requires iOS | 18.0 | **17.6** |
| Devices | iPhone, iPad | 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 Toolbox

[App page](https://appshunter.io/ios/app/nrf-toolbox/id820906058)

This utility app connects to various Bluetooth Low Energy accessories. It demonstrates multiple BLE profiles, including health and fitness sensors, allowing users to monitor data from devices like heart rate monitors and glucose monitors.

**Highlights:** Bluetooth Low Energy connectivity, Demonstrates BLE profiles, Heart Rate Monitor support, Glucose Monitor support, Cycling Speed and Cadence, Running Speed and Cadence

**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 Toolbox free?

nRF Toolbox 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 Toolbox or KFEI CSViewer have ads?

Neither nRF Toolbox nor KFEI CSViewer shows ads.

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

nRF Toolbox ships an update every 5 weeks, and KFEI CSViewer every 5 days. Most recently, nRF Toolbox was updated on October 20, 2026 and KFEI CSViewer on October 17, 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.*