Golden hour
Anything to see tonight?
Là-haut reads the clouds layer by layer, the moon, the haze and the wind, then answers at a glance: a score, a sentence, the best time slot. For stars, sunset or the moon.
iPhone · free, no account, no ads, no in-app purchases
Tonight · Saturday 26 September
Verdon Gorge
8/10
A fine night to look up.
Estimate · good confidence
The sun touches the horizon
The same evening isn't worth the same depending on what you're after. Each profile has its own window and weights — high clouds ruin the stars but make the best sunsets.
Window checkedFrom the end of civil twilight, for 3 hours
Low clouds count in full, mid clouds at 80 %, high clouds at 40 %. The moon gets in the way depending on how lit and how high it is.
Window checkedSunset ± 1 hour
The sweet spot: 20 to 60 % of mid or high clouds to catch the colours. Low clouds block the horizon.
Window checkedThe hours the moon is up, before 1 am
The fuller, the better. If it stays below the horizon, the score is 0 — and the app says so.
Civil twilight
This is the app's real scoring, simplified: move the clouds, the moon, the humidity and the wind. Watch the caps — an overcast sky or a bright moon can't be made up for by dry air.
“Rises late”: after the stars window, so it doesn't spoil them but counts for the Moon profile.
A fine night to look up.
Promising sunset: high clouds to catch the colours.
A good evening for the moon (71 %).
How the stars score is computed
The percentage is each criterion's weight. Caps: the score never goes more than 0.8 above the cloud score, nor, for stars, above what the moon allows.
Nautical twilight
To know whether to go out tonight or wait for Thursday. Confidence drops with lead time and when clouds change a lot hour to hour: the app shows it instead of pretending.
★ Best: wed 30, 9/10
Full dark
No need to open the app at the end of the day.
“Tonight: 8/10 for stars.” Time and profile are yours to set; it's a local notification, scheduled ahead from the latest forecast.
Small, medium or on the Lock Screen. Every 2 hours it fetches your place's forecast and reruns the score with the same engine as the app.
Ask “Ce soir on voit quelque chose avec Là-haut” (the app speaks French for now): the score, the verdict and the slot, out loud.
Moonrise
No ads, no subscription, no in-app purchase, no account. Forecasts come from Open-Meteo's free API, which is for non-commercial use only — so Là-haut will stay free.
One in the morning
The end-of-day question, settled in a second.
Download — freeiPhone · iOS 17 or later · interface in French
