# MPower O2O vs DMS4 Inbox

The clearest difference is update cadence: DMS4 Inbox at every 5 days against MPower O2O's every 3 weeks. MPower O2O's advantage is iOS requirement (12.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

MPower O2O ships an update every 3 weeks, DMS4 Inbox every 5 days. The most recent releases landed on September 10, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | MPower O2O | DMS4 Inbox |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Size | 69 MB | 41 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [MPOWER TECHNOLOGIES LIMITED](https://appshunter.io/developer/1560608499) | [成都讯格得信息科技有限公司](https://appshunter.io/developer/1335530212) |

## What reviewers say

### MPower O2O

[App page](https://appshunter.io/ios/app/mpower-o2o/id1634738007)

**In-app purchases:** none


### DMS4 Inbox

[App page](https://appshunter.io/ios/app/dms4-inbox/id6761091955)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is MPower O2O free?

MPower O2O is free to download, with no in-app purchases.

### Is DMS4 Inbox free?

DMS4 Inbox is free to download, with no in-app purchases.

### Do MPower O2O or DMS4 Inbox have ads?

Neither MPower O2O nor DMS4 Inbox shows ads.

### Which is updated more often, MPower O2O or DMS4 Inbox?

MPower O2O ships an update every 3 weeks, and DMS4 Inbox every 5 days. Most recently, MPower O2O was updated on September 10, 2026 and DMS4 Inbox on September 20, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*