SD401 vs GreenOE
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.
GreenOE
This utility app offers smart battery solutions to optimize device power usage. It aims to enhance the longevity and efficiency of your device's battery. The application is designed for users seeking better power management.
- Smart battery optimization
- Enhanced power efficiency
- Device battery longevity
- User-friendly interface
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Smart Battery Solutions Power Our Lives
Screenshots
Verdict
The clearest difference is iOS requirement: GreenOE at 12.0 against SD401's 15.5. On price, update cadence, 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.
SD401 ships an update every 5 months, GreenOE every 7 months. The most recent releases landed on October 9, 2026 and September 20, 2026 respectively.
| Parameter | SD401 | GreenOE |
|---|---|---|
| Price | Free | Free |
| Rating | — | 1.0 (3 ratings) — better |
| Number of ratings | — | 3 — better |
| Update frequency | Every 5 months — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.5 | 12.0 — better |
| Further details — not scored | ||
| Size | 25 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | Owen Brown | Shenzhen Boiling Water Technology Co., Ltd. |
In-app purchases
SD401
No in-app purchases
GreenOE
No in-app purchases
