nRF Blinky vs KFEI CSViewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
nRF Blinky
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nRF Blinky is an application targeted towards developers who are new to Bluetooth Low Energy. nRF Blinky has the following features: - Scan and connect to any nRF5 DK containing the Nordic Semiconductor’s proprietary LED/Button Service. - Toggle the LED on the development kit On and Off from within the application. - Receive Button press and release events from the development kit and display it within the application. This application is open sourced and the is written in Swift 5 and available on GitHub: https://github.com/NordicSemiconductor/IOS-CoreBluetooth-Mock
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 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.
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 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.
| Parameter | nRF Blinky | KFEI CSViewer |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 9 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 10 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Nordic Semiconductor ASA | KAGA FEI Co., Ltd. |
In-app purchases
nRF Blinky
No in-app purchases
KFEI CSViewer
No in-app purchases
Questions
Is nRF Blinky free?
Is KFEI CSViewer free?
Do nRF Blinky or KFEI CSViewer have ads?
Which is updated more often, nRF Blinky or KFEI CSViewer?
Other comparisons
