# Powder Watts vs RiichiDeck

The clearest difference is in-app purchases: Powder Watts at none against RiichiDeck's 2. RiichiDeck's advantage is update cadence (every 2 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. RiichiDeck sells 2 in-app purchases, starting at $0.99 per month. Powder Watts asks for nothing beyond the download.

Powder Watts ships an update every 3 weeks, RiichiDeck every 2 days. The most recent releases landed on November 3, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Powder Watts | RiichiDeck |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (16 ratings)](https://appshunter.io/ios/app/powder-watts/id1608052817/reviews)** | — |
| Number of ratings | **16** | — |
| Positive reviews | 78.6% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free | — |
| Size | 39 MB | 72 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Powder Watts](https://appshunter.io/developer/1608052819) | [Shinya Fukumura](https://appshunter.io/developer/6811294797) |

## What reviewers say

### Powder Watts

[App page](https://appshunter.io/ios/app/powder-watts/id1608052817)

This app uses patented smart camera technology to monitor and control roof heat cables, preventing unnecessary energy use and potential damage. It leverages computer vision and thermal imagery to activate cables only when needed, saving money and reducing environmental impact.

**Highlights:** Patented smart camera monitoring, Heat cable usage control, Winter condition risk detection, Energy cost savings, Environmental impact reduction, Computer vision technology

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### RiichiDeck

[App page](https://appshunter.io/ios/app/riichideck/id6811294795)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RiichiDeck Pro (Monthly) | $0.99 | per month |
| RiichiDeck Pro (Lifetime) | $6.99 | one-time |


## Frequently asked questions

### Is Powder Watts free?

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

### Is RiichiDeck free?

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

### Do Powder Watts or RiichiDeck have ads?

Neither Powder Watts nor RiichiDeck shows ads.

### Which is updated more often, Powder Watts or RiichiDeck?

Powder Watts ships an update every 3 weeks, and RiichiDeck every 2 days. Most recently, Powder Watts was updated on November 3, 2026 and RiichiDeck on November 6, 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.*