# Castle vs WattShift

The clearest difference is ratings volume: Castle at 5 against WattShift's 1. On price, rating, update cadence and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Castle against 5.0 for WattShift. That said, the two scores are not equally well evidenced: Castle has 5 ratings behind it against 1, so its average is the more settled of the two.

Castle ships an update monthly, WattShift every 3 weeks. Both last shipped on November 3, 2026.

## The numbers

| Metric | Castle | WattShift |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (5 ratings)](https://appshunter.io/ios/app/castle-home-payments/id1594749196/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/wattshift/id6446374436/reviews) |
| Number of ratings | **5** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 48 MB | 6 MB |
| Requires iOS | **15.1** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Castle Pay, Inc.](https://appshunter.io/developer/1511572788) | [WattShift, Inc.](https://appshunter.io/developer/1578777527) |

## What reviewers say

### Castle

[App page](https://appshunter.io/ios/app/castle-home-payments/id1594749196)

Manage all your home expenses, from utility bills to renovation costs, in one secure app. It helps you track spending, find savings opportunities, and provides expert support for your home finance needs.

**Highlights:** Digital home records filing cabinet, Consolidated bill payment, Transaction monitoring for savings, Fraud monitoring and security, Expert home finance support

**Features:** Vision Pro support

**In-app purchases:** none


### WattShift

[App page](https://appshunter.io/ios/app/wattshift/id6446374436)

This app intelligently manages your home thermostat to prioritize the use of renewable energy sources like solar and wind. It automatically shifts cooling and heating schedules to times when energy is cleaner and cheaper, potentially reducing your electricity bill by up to 30% without compromising comfort.

**Highlights:** Maximizes solar and wind energy use, Reduces electricity bills up to 30%, Maintains full comfort and temperature control, Syncs with smart home devices, Automatically shifts thermostat usage, Prioritizes cleaner energy sources

**In-app purchases:** none


## Frequently asked questions

### Is Castle free?

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

### Is WattShift free?

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

### Which has better reviews, Castle or WattShift?

Castle and WattShift are both rated 5.0 out of 5 on the App Store, from 5 and 1 ratings respectively.

### Do Castle or WattShift have ads?

Neither Castle nor WattShift shows ads.

### Which is updated more often, Castle or WattShift?

Castle ships an update monthly, and WattShift every 3 weeks. Most recently, Castle was updated on November 3, 2026 and WattShift on November 3, 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.*