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Screenshots

  • Thalassa screenshot 1
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About Thalassa

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.

What’s new

Version 1.3 · Updated September 9, 2026

• Sharper maps: high-resolution coastline at every zoom level. OpenStreetMap (ODbL) attribution for coastline data. • Dynamic colour palette: when you open a layer the colours auto-fit the data in view, then stay stable as you change date or zoom. Re-fit on demand anytime. • Unified, more readable palette for waves and wind. • Optimization in maps: Sea Level (SSH) and Air Temperature, with dedicated colour scales. • EMODnet bathymetry as a dedicated depth map. • Better display of hourly forecasts in the meteograms. • Various fixes and performance improvements.

App privacy

The developer, CMCC Foundation, reported these privacy practices to Apple.

Data Not Linked to You

The following data, which may be collected but is not linked to your identity, may be used for the following purposes:

  • Location: Precise Location
  • Other Data: Other Data Types

Used for: App Functionality

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