# W vs Ecos501

The clearest difference is iOS requirement: W at 15 against Ecos501's 18.6. 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.

## The numbers

| Metric | W | Ecos501 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Size | 29 MB | 11 MB |
| Requires iOS | **15** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [LumenRadio AB](https://appshunter.io/developer/1443137236) | [Fr. Sauter AG](https://appshunter.io/developer/586916485) |

## What reviewers say

### W

[App page](https://appshunter.io/ios/app/w-modbus/id6472275984)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Ecos501

[App page](https://appshunter.io/ios/app/ecos501/id6759445925)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is W free?

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

### Is Ecos501 free?

Ecos501 is free to download, with no in-app purchases.

### Do W or Ecos501 have ads?

Neither W nor Ecos501 shows ads.

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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.*