# GridCarbon vs Octopus Watch

The clearest difference is price: GridCarbon at Free against Octopus Watch's $1.99. GridCarbon also leads on in-app purchases (none vs 2) and review sentiment (76% vs 65%). Octopus Watch's advantage is rating (4.0 vs 3.2) and update cadence (every 3 weeks vs every 4 months). On ads and device support there is nothing between them.

GridCarbon is free to download; Octopus Watch costs $1.99 up front. Octopus Watch sells 2 in-app purchases, starting at $1.99 per month. GridCarbon asks for nothing beyond the download.

Octopus Watch holds the better App Store score, 4.0 against 3.2. That said, the two scores are not equally well evidenced: GridCarbon has 6 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 76% of GridCarbon's written reviews are positive against 65% of Octopus Watch's, so the app with the better star average is not the one people write more warmly about.

GridCarbon ships an update every 4 months, Octopus Watch every 3 weeks. The most recent releases landed on June 8, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | GridCarbon | Octopus Watch |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [3.2 (6 ratings)](https://appshunter.io/ios/app/gridcarbon/id346832866/reviews) | **[4.0 (1 ratings)](https://appshunter.io/ios/app/octopus-watch/id1490260614/reviews)** |
| Number of ratings | **6** | 1 |
| Positive reviews | **75.7% of reviews** | 64.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 10 MB | 18 MB |
| Requires iOS | **12.0** | 16.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Alex Rogers](https://appshunter.io/developer/346832869) | [Kim Bauters](https://appshunter.io/developer/1451850103) |

## What reviewers say

### GridCarbon

[App page](https://appshunter.io/ios/app/gridcarbon/id346832866)

Monitor the real-time carbon intensity of the UK electricity grid. Understand how electricity generation sources change and identify times when using power is more environmentally friendly. Reduce your carbon footprint by shifting energy consumption to periods of lower grid emissions.

**Highlights:** Real-time carbon intensity updates, Traffic light indicator for intensity levels, Generation mix summary, 24-hour carbon intensity plot, Interactive generation mix chart

**Features:** macOS Compatibility

**In-app purchases:** none


### Octopus Watch

[App page](https://appshunter.io/ios/app/octopus-watch/id1490260614)

Easily manage your Octopus Energy tariffs, track electricity rates, and identify optimal times to use appliances or charge your EV. Offers insights into usage, weather impacts, and export earnings. Optional subscription unlocks advanced features like 48-hour rate predictions and carbon integration.

**Highlights:** Track current and upcoming electricity rates, Identify cheapest times for appliances/EV charging, View historic usage and micro metrics, Receive rate change alerts, Compare tariffs, Export data to CSV, 48h Agile rate predictions (subscription)

**Features:** Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Subscription | $1.99 | per month |
| 1 Year Subscription | $11.99 | per year |


## Frequently asked questions

### Is GridCarbon free?

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

### Is Octopus Watch free?

Octopus Watch costs $1.99, and also offers in-app purchases.

### Which has better reviews, GridCarbon or Octopus Watch?

Octopus Watch is rated higher. GridCarbon averages 3.2 out of 5 from 6 ratings, while Octopus Watch averages 4.0 from 1 ratings.

### Do GridCarbon or Octopus Watch have ads?

Neither GridCarbon nor Octopus Watch shows ads.

### Which is updated more often, GridCarbon or Octopus Watch?

GridCarbon ships an update every 4 months, and Octopus Watch every 3 weeks. Most recently, GridCarbon was updated on June 8, 2026 and Octopus Watch on September 23, 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.*