# SD401 vs GreenOE

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.

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.

## The numbers

| Metric | SD401 | GreenOE |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (3 ratings)](https://appshunter.io/ios/app/greenoe/id6745133836/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 7 months |
| Monetization | — | Free |
| Size | 25 MB | 26 MB |
| Requires iOS | 15.5 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Owen Brown](https://appshunter.io/developer/979499266) | [Shenzhen Boiling Water Technology Co., Ltd.](https://appshunter.io/developer/1688664790) |

## What reviewers say

### SD401

[App page](https://appshunter.io/ios/app/sd401/id979499267)

**Features:** macOS Compatibility

**In-app purchases:** none


### GreenOE

[App page](https://appshunter.io/ios/app/greenoe/id6745133836)

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.

**Highlights:** Smart battery optimization, Enhanced power efficiency, Device battery longevity, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SD401 free?

SD401 is free to download, with no in-app purchases.

### Is GreenOE free?

GreenOE is free to download, with no in-app purchases.

### Do SD401 or GreenOE have ads?

Neither SD401 nor GreenOE shows ads.

### Which is updated more often, SD401 or GreenOE?

SD401 ships an update every 5 months, and GreenOE every 7 months. Most recently, SD401 was updated on October 9, 2026 and GreenOE on September 20, 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.*