# Gridwatch vs PUWER Assessment

The clearest difference is device support: Gridwatch at 5 against PUWER Assessment's 3. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on November 3, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Gridwatch | PUWER Assessment |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free | — |
| Size | 8 MB | 37 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | **iPhone, iPad, iPod, Apple TV, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carl de Wiele](https://appshunter.io/developer/1463272988) | [Knox Thomas Ltd](https://appshunter.io/developer/1859594023) |

## What reviewers say

### Gridwatch

[App page](https://appshunter.io/ios/app/gridwatch/id1553702520)

Monitor real-time energy demand and electricity supply sources for the UK. Track current and past consumption levels to understand grid performance.

**Highlights:** Live UK energy demand metrics, Electricity supply source breakdown, Current consumption levels, Historical consumption data, Grid performance insights

**In-app purchases:** none


### PUWER Assessment

[App page](https://appshunter.io/ios/app/puwer-assessment/id6756261537)

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

**In-app purchases:** none


## Frequently asked questions

### Is Gridwatch free?

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

### Is PUWER Assessment free?

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

### Do Gridwatch or PUWER Assessment have ads?

Neither Gridwatch nor PUWER Assessment shows ads.

### Which is updated more often, Gridwatch or PUWER Assessment?

Gridwatch ships an update every 3 months, and PUWER Assessment every 3 months. Most recently, Gridwatch was updated on November 3, 2026 and PUWER Assessment on November 9, 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.*