# Eco vs Unvigintuple Calc

The clearest difference is ads: Eco at none against Unvigintuple Calc's shown. Eco also leads on iOS requirement (11.0 vs 15.8.3). On price, 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 | Eco | Unvigintuple Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (9 ratings)](https://appshunter.io/ios/app/eco-butler/id6503674864/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | — | Every 2 weeks |
| Monetization | Free | — |
| Size | 178 MB | 36 MB |
| Requires iOS | **11.0** | 15.8.3 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [YOUTO INFORMATION TECHNOLOGY COMPANY LIMITED](https://appshunter.io/developer/1749915187) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### Eco

[App page](https://appshunter.io/ios/app/eco-butler/id6503674864)

Monitor your indoor air quality in real-time and receive alerts for filter replacement. Remotely control your air purifier's settings and view historical data to understand your environment. Contact customer service for support.

**Highlights:** Real-time indoor air quality monitoring, Historical air quality data browsing, Filter lifespan monitoring and replacement reminders, Remote control of device settings, Customizable schedules for device operation

**Features:** macOS Compatibility

**In-app purchases:** none


### Unvigintuple Calc

[App page](https://appshunter.io/ios/app/unvigintuple-calc/id6742525694)

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

**In-app purchases:** none


## Frequently asked questions

### Is Eco free?

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

### Is Unvigintuple Calc free?

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

### Do Eco or Unvigintuple Calc have ads?

Unvigintuple Calc shows ads; Eco does not.

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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.*