# ENGINE4 vs Sirius Communicator

The clearest difference is update cadence: Sirius Communicator at daily against ENGINE4's monthly. Sirius Communicator also leads on iOS requirement (10.0 vs 15.5). 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.

ENGINE4 ships an update monthly, Sirius Communicator daily. The most recent releases landed on September 17, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | ENGINE4 | Sirius Communicator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Daily** |
| Size | 86 MB | 90 MB |
| Requires iOS | 15.5 | **10.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mobile Function GmbH](https://appshunter.io/developer/593506225) | [PCCW Global Limited](https://appshunter.io/developer/796848105) |

## What reviewers say

### ENGINE4

[App page](https://appshunter.io/ios/app/engine4/id1105393634)

**Features:** Vision Pro support

**In-app purchases:** none


### Sirius Communicator

[App page](https://appshunter.io/ios/app/sirius-communicator/id1456383975)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ENGINE4 free?

ENGINE4 is free to download, with no in-app purchases.

### Is Sirius Communicator free?

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

### Do ENGINE4 or Sirius Communicator have ads?

Neither ENGINE4 nor Sirius Communicator shows ads.

### Which is updated more often, ENGINE4 or Sirius Communicator?

ENGINE4 ships an update monthly, and Sirius Communicator daily. Most recently, ENGINE4 was updated on September 17, 2026 and Sirius Communicator on September 16, 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.*