Now available on iPhone

Your sky,
understood.

Sun & moon precision, multi-source forecasts, wind visualization, and shadow tools — unified in one beautiful iPhone app.

Download on the App Store Explore Features
iOS 18+ Required
★★★★★ 4.8Rating
Free to download
iCaelum welcome screen
☀️  Golden Hour 7:23 PM
🌙  Full Moon · 3 days
💨  SW Wind 12 km/h
🌡️  UV Index 7 — High
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6Weather Providers
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4.8 / 5App Store Rating
📱
iOS 18+iPhone Native
🔭
10+ ToolsSky & Weather
Features

Everything the sky
has to offer.

iCaelum brings precision astronomical data and multi-source weather into one coherent, activity-oriented iPhone experience.

🗂️

Smart Activity Profiles

Pre-built views that surface only the data relevant to your activity. No clutter — just the signal you need to make the call.

🏖️ Beach Lover 🎣 Fisherman 📸 Photographer 🌱 Gardener 🧭 Explorer
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Multi-Source Forecasts

Compare DMI, SMHI, FMI, Yr, Open-Meteo & OpenWeather side-by-side for the most confident prediction.

🔴

Live Tracking

Real-time sun & moon position with smart alerts for rise, set, and twilight phases.

🌙

Celestial Data

Precise almanacs with rise/set times, moon phases, seasonal trends, and astronomical calculations.

📐

Shadow Calculator

Shadow length and direction for any date, time, and location. Ideal for planning and construction.

🛡️

Environmental Monitor

Real-time safety tracking for weather, air quality, UV radiation, pollen, and natural disaster alerts at your location.

Air Quality UV Index Pollen Wind Safety Alerts
Screenshots

See it in action.

Thoughtfully designed for iPhone. Every screen surfaces the right data at exactly the right moment.

Data Sources

Trusted by the world's
best weather services.

We aggregate from six of the most accurate meteorological agencies so you always have the clearest picture.

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OpenWeatherMap
Global forecasts with reliable temperature, precipitation, and wind data covering every corner of the world.
🇳🇴
Yr · met.no
Exceptional accuracy across the Nordics and coastal regions with detailed precipitation modelling.
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Open-Meteo
Hourly data combining multiple national weather models — open-access, no restrictions.
🇫🇮
Finnish FMI
High-accuracy forecasts for Finland and surrounding Nordic regions from the national meteorological institute.
🇸🇪
Swedish SMHI
Detailed weather coverage for Sweden and nearby Scandinavian areas from the Swedish Met Office.
🇩🇰
Danish DMI
High-resolution regional forecasts for Denmark, Greenland, and the Faroe Islands.
Free to download

Ready to master
the sky?

Join thousands of photographers, fishermen, gardeners, and sky enthusiasts who rely on iCaelum every day.

Download on the App Store