SunArc See where the sun goes, and where the shadow falls.
SunArc puts the sun's path on the map for your location and shows shadows from buildings, trees or objects you place, for any time of day and any season.
Where the sun is headed
A translucent band traces the sun's path across your map, from sunrise to sunset, for your current position or any other position in the world.
- Calculated on your device only
- Rotates with the map, or locks to your compass heading
- Works for today, wherever you are
Shadows from buildings and your own objects
Shadows cast by real buildings around you, and objects you place.
- Elevate your position to check for shadow on buildings or objects
- Move through the day, or jump to midsummer or midwinter
- Place objects and resize them to their real dimensions
Built for the questions that actually come up
One purpose, no clutter.
Solar panels
Will the roof still get enough sun in winter, once the sun sits low?
Gardens & trees
See how far a tree's shadow reaches at different times of year before you plant.
Terraces & balconies
Find out when your terrace clears the neighbour's building.
Home buying & renting
Check a property's real light and shade before you commit.
Camping & photography
Know sunrise, sunset and shade cover for a spot before you're standing in it.
Gardening & growing
Match beds and pots to how much real daily sun a spot gets, season by season.
Questions worth answering honestly
How accurate are SunArc's shadows?
Sun position comes from standard solar-position math for your exact location and time. Building shadows use real height data from map tiles. Buildings without usable height data are skipped rather than guessed at. It's a solid tool for planning and scouting, not a substitute for a certified site survey.
Can I use it to plan solar panels?
Switch the season control to midwinter and set the floor level to the roof or balcony you're considering. That's the worst-case sun angle it will ever see. Partial shade cuts panel output more than its size suggests, so this is a fast way to rule a spot out, or confirm it, before you commit to an installer's quote.
Is SunArc free?
It opens for everyone, showing real shadows for the current moment. A one-time purchase of $1 unlocks moving through any hour and season, and placing your own objects. Pay once, no subscription.
Do I need an account?
No. You can use everything without signing up, there's no account or login to create.
Does SunArc work offline?
The map needs a connection to load. Once it's loaded, sun position and shadow calculations run entirely on your device.
Free to explore. $1 to unlock ShadeCheck. Forever.
No subscription. No account. No ads.