Powder Watts vs RiichiDeck
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Powder Watts
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.
- Patented smart camera monitoring
- Heat cable usage control
- Winter condition risk detection
- Energy cost savings
- Environmental impact reduction
- Computer vision technology
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Why Powder Watts Patented Technology? Taking proven smart camera computer vision technology to monitor and control heat cables on roofs during Winter. With vision, we know. Stop unnecessary and costly guesswork with Heat Cables. Patented smart camera monitoring of unnecessary heat cable usage. Why: Heat cables cost a lot to run – both in money and environmental impact. Heat cables draw so much power they typically double to quadruple the electric usage of the structure they protect! How it works: Utilizing the same smart camera technology we see in collision avoidance for cars, thermal imagery for first responders and smart software messaging, the Powder Watts system is able to accurately detect when you are most at risk of roof damage from winter conditions and efficiently turn on and off your heat cable systems at the optimal times.
RiichiDeck
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RiichiDeck is an all-in-one companion app designed to streamline 4-Player Japanese Riichi Mahjong, covering score calculation assistance, match logging, mahjong timers, and tournament/league management powered by Web Viewer. [Key Features] * Intuitive Score Entry & Calculation Assistant Quickly and accurately record final scores and tenbo transfers with fu/han input helpers and point declaration assistants. * Mahjong Clock (Match Timer) Equipped with remaining time warning sounds and vibration alerts to keep game pace smooth and on schedule. * Tournament Management, Pairing PDF & Table QR Sync [NEW] Simply scan the table QR code generated on the Web Viewer (browser) pairing PDF with your smartphone camera to automatically set up the table number, round, seated player names, and rule presets in one tap. * Live Tournament Leaderboard & Visual Analytics (Web Viewer Sync) Match results from each table are reflected on the tournament leaderboard in real-time (optimized for big-screen projectors). Easily share score trend charts and player performance stats via URL or image cards. * Mahjong Glossary (All 38 Yaku & Rules Guide) Search and reference all 38 Yaku conditions, han values, fu calculations, and essential mahjong terminology inside the app. Perfect for quick rule checks and beginner support. * Match Memo for Each Hanchan Record custom notes (up to 300 characters) such as Yakuman milestones, game reviews, or reflections on each match card. * Full 5-Language Multilingual Support The app interface, settings, and Web Viewer seamlessly support English, Japanese, Traditional Chinese, Simplified Chinese, and Korean. Ideal for international tournaments and global friendlies. * No Registration Required & Privacy-Focused Design All match data is stored safely on your device, ready to use immediately without any sign-up or login. When using tournament sync or Web Viewer sharing, data is securely relayed temporarily without requiring any user account. * Note: Designed exclusively for 4-Player Japanese Riichi Mahjong (3-Player / Sanma is not supported). [Terms of Use & Privacy Policy] * Terms of Use (EULA / Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ * Service Terms: https://riichideck.com/terms.html * Privacy Policy: https://riichideck.com/privacy.html
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Powder Watts | RiichiDeck |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (16 ratings) — better | — |
| Positive reviews | 78.6% of reviews | — |
| Number of ratings | 16 — better | — |
| Update frequency | Every 3 weeks | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 39 MB | 72 MB |
| Age rating | 4+ | 4+ |
| Developer | Powder Watts | Shinya Fukumura |
In-app purchases
Powder Watts
No in-app purchases
RiichiDeck
- RiichiDeck Pro (Monthly)$0.991 Month
- RiichiDeck Pro (Lifetime)$6.99
Questions
Is Powder Watts free?
Is RiichiDeck free?
Do Powder Watts or RiichiDeck have ads?
Which is updated more often, Powder Watts or RiichiDeck?
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