# Muninn vs GridMix

The clearest difference is in-app purchases: GridMix at none against Muninn's 3. GridMix also leads on ratings volume (3 vs 1) and iOS requirement (16.2 vs 26.0). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Muninn sells 3 in-app purchases, starting at $2.99 per month. GridMix asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Muninn against 5.0 for GridMix. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

Muninn ships an update every 5 days, GridMix every 3 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Muninn | GridMix |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/muninn-habit-tracker-widget/id6443640124/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/gridmix/id6751874047/reviews) |
| Number of ratings | 1 | **3** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 3 days** |
| Monetization | Freemium | **Free** |
| Size | 17 MB | 97 MB |
| Requires iOS | 26.0 | **16.2** |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Norse Ventures LLC](https://appshunter.io/developer/1021405857) | [John Chaykowsky](https://appshunter.io/developer/1837354833) |

## What reviewers say

### Muninn

[App page](https://appshunter.io/ios/app/muninn-habit-tracker-widget/id6443640124)

This app automatically tracks your daily habits by syncing with your phone's Health data and photo library. It helps you build positive routines and break bad ones with customizable widgets and streak tracking.

**Highlights:** Automatic habit logging from Health and Photos, Home and Lock Screen widgets, Streak tracking for positive habits, Tracking habits to quit, Customizable habit scheduling, Rest day support for streaks

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Muninn Pro Monthly | $2.99 | per month |
| Muninn Pro Yearly | $19.99 | per year |
| Muninn Pro Lifetime | $39.99 | one-time |


### 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, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Muninn free?

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

### Is GridMix free?

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

### Which has better reviews, Muninn or GridMix?

Muninn and GridMix are both rated 5.0 out of 5 on the App Store, from 1 and 3 ratings respectively.

### Do Muninn or GridMix have ads?

Neither Muninn nor GridMix shows ads.

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

Muninn ships an update every 5 days, and GridMix every 3 days. Most recently, Muninn was updated on November 3, 2026 and GridMix on November 5, 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.*