SD401 vs Num Count
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SD401
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SD401 is a quality control system. The SD401 system consists of an iPhone with SD401 app and external SH7 Reader hardware (purchased separately). The SD401 app provides the GUI for displaying data. Data is received via Bluetooth communications from the SH7 Reader. Displayed data is in numeric form with the addition of alarm “LEDS” for each data point. The number of displayed data points is configured via a setup screen, with password control. Also, the alarm LEDS are configured with limits set for each data point. A data value within limits will be shown with a “green” LED and value outside limits with a “red” LED. Additional SH7 Reader readings such as temperature and battery voltage can be displayed in the app.
Num Count
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It is an application to use when you want to count the number of something. It can be used intuitively with a simple UI. Because you can save the counter, restarting from the middle is also easy.
Screenshots
Verdict
The clearest difference is price: SD401 at Free against Num Count's $0.99. SD401 also leads on update cadence (every 5 months vs every 21 months) and iOS requirement (15.5 vs 26.0). On 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
SD401 is free to download; Num Count costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SD401 ships an update every 5 months, Num Count every 21 months. The most recent releases landed on September 22, 2026 and October 7, 2026 respectively.
| Parameter | SD401 | Num Count |
|---|---|---|
| Price | Free — better | $0.99 |
| Update frequency | Every 5 months — better | Every 21 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.5 — better | 26.0 |
| Further details — not scored | ||
| Size | 25 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Owen Brown | Kensuke Hoshikawa |
In-app purchases
SD401
No in-app purchases
Num Count
No in-app purchases
