SunPetal
Not your garden. Not your postcode. That spot.
Stand where you want to plant, hold your phone up and sweep it across the sky. SunPetal measures the actual skyline above that spot — the tree, the fence, the corner of the house — and works out the hours of direct sun it gets, month by month, morning and afternoon.
Coming soon to the App Store · iPhone
Hours of direct sun a day across your growing season, every month, and morning and afternoon counted apart.
Walk from bed to bed. The phone measures the steps between them and paints the sun on the ground in between.
It measures how high you held the phone; one more sweep near the bed and you can read soil, bed or waist height.
Slide through the seasons: the sun's path climbs and falls, and the deciduous trees leaf out and go bare.
Paint out a tree you're thinking of felling and see every figure move. Nothing is felled — it's a question.
Every answer comes with a range, and what that range is made of. A number without an error bar is a guess.
SunPetal doesn't forecast weather. Every number is the sun a spot would get on a day with no cloud — cloud can only take it away, so read it as the ceiling for a date. And it can't see through a tree: if something stands behind what you painted out, it's still in the map and still blocking, which is the right answer.
No account. No network code at all. No ads, no analytics. Your location is used to work out where the sun crosses your sky and is never sent anywhere. Read the privacy policy — it's short because there's nothing to confess.