# Spool Ethanol Analyzer (Watch) vs ECU Map Switcher by D

The clearest difference is device support: Spool Ethanol Analyzer (Watch) at 3 against ECU Map Switcher by D's 1. Spool Ethanol Analyzer (Watch) also leads on iOS requirement (13.0 vs 17.0). On price, 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.

## The numbers

| Metric | Spool Ethanol Analyzer (Watch) | ECU Map Switcher by D |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Size | 1 MB | 1 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ajay Rajeev](https://appshunter.io/developer/1418992095) | [LUN LIU](https://appshunter.io/developer/1890125123) |

## What reviewers say

### Spool Ethanol Analyzer (Watch)

[App page](https://appshunter.io/ios/app/spool-ethanol-analyzer-watch/id1531053194)

**In-app purchases:** none


### ECU Map Switcher by D

[App page](https://appshunter.io/ios/app/ecu-map-switcher-by-d-sync/id6761521552)

**In-app purchases:** none


## Frequently asked questions

### Is Spool Ethanol Analyzer (Watch) free?

Spool Ethanol Analyzer (Watch) is free to download, with no in-app purchases.

### Is ECU Map Switcher by D free?

ECU Map Switcher by D is free to download, with no in-app purchases.

### Do Spool Ethanol Analyzer (Watch) or ECU Map Switcher by D have ads?

Neither Spool Ethanol Analyzer (Watch) nor ECU Map Switcher by D 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.*