nRF Toolbox vs KFEI CSViewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
nRF Toolbox
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.
- Bluetooth Low Energy connectivity
- Demonstrates BLE profiles
- Heart Rate Monitor support
- Glucose Monitor support
- Cycling Speed and Cadence
- Running Speed and Cadence
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nRF Toolbox works with a wide range of Bluetooth Low Energy accessories. It contains applications demonstrating BLE profiles: Cycling Speed and Cadence, Running Speed and Cadence, Heart Rate Monitor, Blood Pressure Monitor, Health Thermometer, Glucose Monitor, Continuous Glucose Monitor, Monitoring & Diagnostic and more. The source code of this application is available on GitHub: https://github.com/nordicsemi/iOS-nRF-Toolbox
KFEI CSViewer
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This application displays the results of Channel Sounding, which measures the distance between two Bluetooth devices. It also allows you to configure an offset for the displayed results.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | nRF Toolbox | KFEI CSViewer |
|---|---|---|
| Price | Free | Free |
| Rating | 2.6 (8 ratings) — better | — |
| Positive reviews | 22.2% of reviews | — |
| Number of ratings | 8 — better | — |
| Update frequency | Every 5 weeks | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.0 | 17.6 — better |
| Further details — not scored | ||
| Size | 9 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Nordic Semiconductor ASA | KAGA FEI Co., Ltd. |
In-app purchases
nRF Toolbox
No in-app purchases
KFEI CSViewer
No in-app purchases
Questions
Is nRF Toolbox free?
Is KFEI CSViewer free?
Do nRF Toolbox or KFEI CSViewer have ads?
Which is updated more often, nRF Toolbox or KFEI CSViewer?
Other comparisons
