Your Personal Sky Assistant
The sky above you in one app: where the Sun and Moon are, when the light will be good, what the weather will do and whether it is safe to be outside. Ten activity profiles, any place in the world on its own local time, and an AR viewfinder that guides you to the Sun and Moon.
Version 2.2 • iPhone & iPad • iOS 18+ • One-time purchase, no subscription
Powerful Features
Everything you need to understand and plan around the sky, the weather and celestial events, with a detailed guide on every screen.
Sky Now
Your sky at a glance: the Sun's arc through the day with golden hour, blue hour and twilight, where the Sun and Moon are now, sunrise, sunset, day length and tonight's Moon. Home follows the daylight: a blue sky by day, warm at golden hour, stars at night.
Any Place, Its Own Time
Use your location or choose any place in the world: search a town, drop a pin or type coordinates. The whole app follows it, and every time is shown in that place's local time.
Ten Profiles for What You Do
Photographer, Beach Lover, Gardener & Farmer, Hiker, Fisherman & Hunter, Architect, Event Organizer, Sailor & Navigator, Night Runner and Astronomer, with planning tools such as a time-lapse planner, sunscreen and rain reminders, campsite light, an offline SOS signal, celestial sights, building shade, an annual 3D sky and sky quality from satellite night-light data.
Sun & Moon
Today's path, position, rise, transit and set; a year ribbon and full-year almanac; both solstices compared with today; golden and blue hours for any date; and upcoming solar and lunar eclipses drawn as you will see them from your place. Times checked against NASA JPL ephemerides.
Forecasts
A 48-hour ribbon of temperature, rain and sky, then an hourly table and daily outlook. iCaelum picks the best source for the place, lets you compare others, and adds an AI summary of the next 24 hours.
Sentinel Safety Monitor
A 24-hour exposure dial for UV, air quality and pollen, an outdoor safety index, asthma, heat and road risk, grass, tree and weed pollen on international levels, and official MeteoAlarm warnings, with alerts you set yourself.
2D & AR Trackers
Find the Sun and Moon on a 2D sky chart that turns with your compass, or through the camera: the AR viewfinder shows where to turn and tilt, with sound or vibration as you get close.
Shadows, Winds & Radars
Shadow length and direction for any object, place and time, drawn to scale; live wind on a map with an animated wind forecast; and rain radars from RegnRadar, DMI, MeteoBlue and RainViewer.
See It in Action
Redesigned from top to bottom for version 2.2, on iPhone and iPad.
Sky Now
The Sun's day, golden hour and the Moon at a glance, on a Home sky that follows the daylight.
Ten Profiles
From photography and sailing to stargazing, each with its own planning tools.
Astronomer
Darkness, sky quality, planets, meteor showers, aurora and clouds for a night under the stars.
Photographer
Golden and blue hours on a dial for the whole day.
Forecasts
A 48-hour ribbon from the best source for the place, then hourly and daily detail.
Sentinel
UV, air and pollen exposure for the next 24 hours, with alerts you choose.
A Year of Daylight
Sunrise, sunset and noon for every day, on a year ribbon and in a full table.
Eclipses
What you will see from your place, how much is covered and when.
Shadows to Scale
Length and direction for any height, place and time.
AR Viewfinder
Shows where to turn and tilt to find the Sun or Moon, with sound or vibration.
Today's Sun on iPad
The Sun's path, position, rise and set, for any place.
Trusted Weather Sources
iCaelum picks the best forecast for the place: national weather services where they apply and Yr elsewhere. Compare with global sources, plus rain radars from RegnRadar, DMI, MeteoBlue and RainViewer.
🇳🇴Yr (MET Norway)
The default forecast worldwide wherever no national service applies.
🇺🇸U.S. National Weather Service
The official forecast across the United States.
🇸🇪SMHI
The Swedish national weather service.
🇫🇮FMI
The Finnish Meteorological Institute.
🇭🇰Hong Kong Observatory
The official forecast for Hong Kong.
🇹🇼Central Weather Administration
Taiwan's national weather service.
🌐Open-Meteo, WeatherAPI.com and OpenWeather
Global sources to compare with the chosen forecast.
Ready to Master the Sky?
One purchase, every feature: €2.99, no subscription, no account.
Get iCaelum on the App Store