# éCO2mix vs Ring Sizer & Size Measure

The clearest difference is in-app purchases: éCO2mix at none against Ring Sizer & Size Measure's 3. éCO2mix also leads on iOS requirement (15.1 vs 17.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Ring Sizer & Size Measure sells 3 in-app purchases, starting at $5.99 per 7 days. éCO2mix asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 23, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | éCO2mix | Ring Sizer & Size Measure |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/eco2mix-rte/id424593993/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | — |
| Size | 49 MB | 20 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [RTE Reseau de transport d'electricite](https://appshunter.io/developer/424593996) | [KELVIN SENANU WALLACE](https://appshunter.io/developer/1888050842) |

## What reviewers say

### éCO2mix

[App page](https://appshunter.io/ios/app/eco2mix-rte/id424593993)

This app provides real-time insights into the French electrical system, visualizing consumption trends, production sources, and greenhouse gas emissions. It aims to make complex energy data accessible to everyone, fostering better understanding and consumption habits.

**Highlights:** Visualize French electrical system data, Track consumption trends, Analyze production sources, Monitor greenhouse gas emissions, View regional data, Consult European market spot prices

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

**In-app purchases:** none


### Ring Sizer & Size Measure

[App page](https://appshunter.io/ios/app/ring-sizer-and-size-measure/id6771506522)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access for a week | $5.99 | per 7 days |
| All Access for a year | $29.99 | per year |
| All Access Forever | $31.99 | one-time |


## Frequently asked questions

### Is éCO2mix free?

éCO2mix is free to download, with no in-app purchases.

### Is Ring Sizer & Size Measure free?

Ring Sizer & Size Measure is free to download, with in-app purchases available.

### Do éCO2mix or Ring Sizer & Size Measure have ads?

Neither éCO2mix nor Ring Sizer & Size Measure shows ads.

### Which is updated more often, éCO2mix or Ring Sizer & Size Measure?

éCO2mix ships an update every 2 months, and Ring Sizer & Size Measure every 2 months. Most recently, éCO2mix was updated on October 23, 2026 and Ring Sizer & Size Measure on October 28, 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.*