Why we built FOMO Sun

Every winter, people in Switzerland do a weird dance. You check MeteoSwiss. You check SRF Meteo. You check the webcam on the mountain your friend mentioned. You open Google Maps. You toggle between Zurich and Bern in your head and try to guess which one is under the fog line today.

Meanwhile, the sun is shining 40 minutes away. You just don't know where.

FOMO Sun is the app we wished existed during those winters. One question: where's the sun today, within reach?

The fog problem is real

In the Mittelland — Basel, Zurich, Bern, Luzern, and everywhere in between — winter days trap a grey cap of fog over the plateau while 800 metres up the sky is impossibly blue. It's called a Kaltluftsee, a cold-air lake. The physics are well known. The logistics of escaping it are not.

Most weather apps tell you what's happening where you are. That's not the question we have on grey mornings. We have a different question: where should I go?

One screen, one answer

FOMO Sun takes your origin city and your tolerance for travel time. It scores 323 curated destinations across Switzerland, Liechtenstein, neighbouring Alsace, the Black Forest, and the Aosta-adjacent valleys. For each, it blends three things:

• Forecast sunshine minutes (Open-Meteo, MeteoSwiss for Swiss destinations)
• Travel time by train or car (SBB / OJP public data)
• Net sun gained after travel

Out comes a ranked list. One hero card shows the best escape. The rest let you sort by closest, warmest, or most sun.

That's the whole app.

Who it's for

• You in Basel, checking whether today is an Engadin day.
• Your friend in Zurich who's already looked at Uetliberg three times this week.
• Your parents-in-law in Luzern who ask "wohin?" every Saturday.
• Anyone visiting Switzerland who doesn't know the Mittelland-versus-Alps thing is real.

FOMO Sun is free, has no accounts, no ads, and no dark patterns. It works on the train. If you share it with someone and they find sun, that's the product working.