# GridMix vs Chartes

The clearest difference is in-app purchases: GridMix at none against Chartes's 1. GridMix also leads on update cadence (every 3 days vs every 6 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Chartes sells 1 one-off in-app purchase. GridMix asks for nothing beyond the download.

GridMix ships an update every 3 days, Chartes every 6 weeks. The most recent releases landed on September 19, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | GridMix | Chartes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/gridmix/id6751874047/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 6 weeks |
| Monetization | Free | — |
| Size | 97 MB | 50 MB |
| Requires iOS | 16.2 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [John Chaykowsky](https://appshunter.io/developer/1837354833) | [Aiofeffect LLC](https://appshunter.io/developer/1833105894) |

## What reviewers say

### GridMix

[App page](https://appshunter.io/ios/app/gridmix/id6751874047)

This app visualizes your region's live CO₂ emissions and forecasts them for the next 24 hours. It helps you identify the cleanest times to use electricity, like charging an EV or running appliances, to reduce your carbon footprint.

**Highlights:** Live CO₂ emissions visualization, 24-hour emissions forecast, Marginal Operating Emissions Rate (MOER), Fossil fuel percentage on grid, Location-aware coverage, Near real-time updates

**Features:** macOS Compatibility

**In-app purchases:** none


### Chartes

[App page](https://appshunter.io/ios/app/chartes/id6756995293)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chartes Lifetime | $1.99 | one-time |


## Frequently asked questions

### Is GridMix free?

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

### Is Chartes free?

Chartes is free to download, with in-app purchases available.

### Do GridMix or Chartes have ads?

Neither GridMix nor Chartes shows ads.

### Which is updated more often, GridMix or Chartes?

GridMix ships an update every 3 days, and Chartes every 6 weeks. Most recently, GridMix was updated on September 19, 2026 and Chartes on September 15, 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.*