Thalassa vs SkyRewind
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Thalassa
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Thalassa turns professional ocean and weather models into a simple map and a friendly advisor for anyone who spends time on the water. REAL-TIME MARINE MAP See the Mediterranean come alive with animated sea-surface currents, wave height, wind, rain, cloud cover, pressure, temperature and water quality. Scrub the timeline — hourly near now, out to +10 days — to watch conditions evolve, tap any point for a detailed meteogram, and switch between layers with a single tap. • Sea-surface currents (animated streamlines) • Wave height, period and direction • Wind, air temperature and mean sea-level pressure • Rain and cloud cover, with sky symbols • Sea temperature and water transparency • Satellite and in-situ observations • Adaptive timeline: hourly near now, out to +10 days SEA ADVISOR — YOUR AI GUIDE Not sure where to go? Just ask. Tell Sea Advisor what you want to do — swim, kayak, surf, snorkel or sail — and it checks the live marine forecast to recommend the best spots and times along the coast, with clear safety notes (waves, wind, UV). TRUSTED DATA Forecasts come from Copernicus Marine (CMEMS), ECMWF and EMODnet — the same operational models used by scientists — delivered by CMCC, the Euro-Mediterranean Center on Climate Change. Thalassa is free, has no ads, and does not track you.
SkyRewind
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Weather now. The next few hours. This day, years ago. SkyRewind brings current conditions, forecasts and historical comparisons for your area together on one compact main screen, with no vertical page scrolling. Swipe horizontally through hours, dates and years to explore the data. WEATHER WHERE YOU ARE When you open the app, it asks for permission to use your device's location. If you allow access, it selects your weather area and checks your position while you use the app and when you reopen it. There is no background location tracking. If you decline GPS access, you can select one town manually and still use weather, forecasts and history. Choosing another town replaces the previous one; there is no list of favorite places. A manually selected town stays fixed and does not follow your movements. No account is required. TODAY, TOMORROW AND YEARS PAST - Check the current temperature, feels-like temperature, conditions and weather-data timestamp. - Explore the next 24 hours for temperatures and rain probability, including after midnight. - See forecasts for today and the following six days. - Compare the selected day's forecast low and high with the same calendar date in previous years. - Move along the historical timeline to select a year. Each difference clearly identifies Today or Forecast and whether it is higher or lower. The current temperature remains separate from daily comparisons: low with low, high with high. The visual atmosphere follows the season, time of day and difference from the historical average. HISTORY WITH CONTEXT Historical coverage can extend back to 1940 where data is available for that area and date. A new area's archive may take time to prepare: the app indicates loading, partial coverage or temporary unavailability. A complete series is not necessarily available for every date or location. Data is provided by Open-Meteo. Current conditions and forecasts are based on weather models; the displayed timestamp refers to the data, not a live measurement from a station at your location. Historical ERA5 data is a model-based reanalysis of the area. Averages and differences are calculated by SkyRewind. Weather data is licensed under CC BY 4.0. The app uses Italian when the system language is Italian and English otherwise. You can change the language in Settings. Weather information is indicative and should not be your only source for emergencies, personal safety or critical operational decisions.
Screenshots
Verdict
The clearest difference is update cadence: SkyRewind at daily against Thalassa's every 3 weeks. SkyRewind also leads on iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support 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. Neither carries in-app purchases, so what you see is what you pay.
Thalassa ships an update every 3 weeks, SkyRewind daily. The most recent releases landed on September 19, 2026 and October 1, 2026 respectively.
| Parameter | Thalassa | SkyRewind |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | CMCC Foundation | Giuseppe Nesca |
In-app purchases
Thalassa
No in-app purchases
SkyRewind
No in-app purchases









