Thermik — read the sky before you fly

Fly smarter.
Read the sky.

A paragliding forecast that knows the difference between a sun-baked south face and a shaded valley. Terrain-aware thermals, real upper-air soundings, and an honest "no thermals at this hour" when there aren't any.

AROME · ICON-D2 · Open-Meteo Free core · Pro for serious XC Built by a pilot

Planning a flight shouldn't need three paid subscriptions.

Most pilots stitch together SkySight, Windy, and a velivole sounding while squinting at five tabs. Each app shows you one slice — none of them tell you "this ridge bakes at 13:00, the valley sinks at 16:00, launch at 11:30."

🌤️ Generic grid modelsOpen-Meteo and AROME give you a 2.5 km cell — useless for picking the right spur.

💸 Paid apps for what should be freeSkySight is €60/year for data that originated as public NWP output.

🤷 No "why is it empty?"When the model has no data, most apps just show a blank screen. You can't tell if it's broken or calm.

Three things, done seriously.

No clever AI buzzword soup. Just careful physics, careful data, and a careful eye for honesty.

Terrain-aware thermals

We modulate W★ by slope, aspect, sun angle, and land cover at 90 m resolution. A south-facing ridge at noon glows; a forested valley doesn't.

Multi-source NWP

velivole's AROME (1.3 km) is primary. ICON-D2 covers the German alps. Open-Meteo is the global fallback. If one falls over, the others carry the flight.

Honest empty states

If the air is calm or the model is sleeping, we say so — not a blank map. A fallback badge appears when we're showing Open-Meteo instead of AROME.

Discrete thermal blobs, not blurry heatmaps.

Each glowing cyan puff is a detected updraft — peak-local-maximum on the terrain-modulated W★ field. Time slider scrubs through the day; convergence overlays add the airmass story.

90 m

DEM resolution

1.3 km

AROME grid

7 days

Forecast horizon

< 500 ms

Tile latency (cached)

Built by a paragliding pilot, not a SaaS founder.

The forecast data underneath Thermik — AROME, ICON-D2, Open-Meteo, SRTM, ESA WorldCover — is all public, paid for by your taxes. The core map stays free. A Pro tier covers serious XC features and the cost of the better models.

Free account — generous daily forecasts, the full terrain-aware map

Pro — route planning, custom alerts, longer horizon, higher-res tiles

PWA — installs to your home screen, works offline-ish

Open about its fallback states — you always know the data source

Anonymous flight feedback helps train the next-gen thermal model — opt-in, never sold

Fly smarter.
Read the sky.