RainGuRU vs Windmaster
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RainGuRU
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The version shown on this website uses real-time KNMI radar data and a custom loss function designed to improve accuracy for heavy rainfall intensities above 5 mm/h. This is significant as other deep-learning models tend to give too much weight to low rainfall intensities, producing forecasts that are excessively smoothed.
Windmaster
This app provides detailed wind, wave, and tide forecasts for water sports enthusiasts. It allows users to compare multiple global forecast models, view live wind data from nearby stations, and receive personalized gear recommendations. Get alerts for optimal conditions and discover new spots worldwide.
- Masterforecast for accurate spot predictions
- Global forecast model comparison
- Live wind data with 6-hour trend
- Personalized kite/sail size recommendations
- Real tide curves
- Wind alerts for optimal sessions
- Interactive wind map
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Windmaster is the wind, wave, and tide forecast built for people who dare to challenge the conditions. Kitesurfers, windsurfers, wingers, and surfers: stop refreshing five different apps and guessing whether your spot is going to fire. WHY WINDMASTER Masterforecast: highly accurate calibrated forecast for your spot. Global forecasts: access global models and compare them to elevate accuracy of predictions for what works best on your local spot. Compare the models GFS, ECMWF, ICON, AROME and more, side by side, so you can see how much the forecast actually agrees before you commit to the drive. Live wind from the nearest station Real ground-truth readings from weather stations near your spot, updated continuously, with a 6-hour trend so you can see it building or fading. The right gear, every hour Set your weight, skill, and quiver once, and Windmaster recommends the kite or sail size for every hour of the forecast. No more rigging the wrong gear. Real tides Actual tide curves for coastal spots, because timing the session matters as much as the wind. Wind alerts A morning heads-up the moment one of your saved spots is set to turn on. Never miss a good day again. Interactive wind map See the wind across the whole region at a glance, scrub through time, and find new spots near you. Hand-picked spots worldwide From Tarifa to Cape Town to Le Morne, with curated local detail on wind directions and conditions. WINDMASTER PRO Unlock every forecast model, the live 6-hour wind trend, and wind alerts. Start with a free trial, cancel anytime. Built by riders, for riders. See you on the water. Terms of Use (EULA): https://windmaster.app/terms Privacy Policy: https://windmaster.app/privacy-policy
Screenshots
Verdict
The clearest difference is in-app purchases: RainGuRU at none against Windmaster's 2. RainGuRU also leads on device support (3 vs 1) and iOS requirement (11.0 vs 17.0). Windmaster's advantage is update cadence (fortnightly vs every 13 months). On price and ads 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. Windmaster sells 2 in-app purchases, starting at $1.99 per month. RainGuRU asks for nothing beyond the download.
RainGuRU ships an update every 13 months, Windmaster fortnightly. The most recent releases landed on October 3, 2026 and October 1, 2026 respectively.
| Parameter | RainGuRU | Windmaster |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 13 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 11.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 22 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | HKV lijn in water | Swipe Up B.V. |
In-app purchases
RainGuRU
No in-app purchases
Windmaster
- Yummy Pro Monthly14 Days trial$1.991 Month
- Windmaster Pro Yealry14 Days trial$8.991 Year
