Sun mapping.
A plant app that knows your rooms.
Walk to each window. Hold your phone against the glass. Tap once. Planterra reads the compass direction and, from that day on, computes the sun's real path across your home - every hour, every season.
Three inputs, one honest model of your home's light.
Your iPhone's compass
Hold the phone flat against the window glass. The magnetometer reads which way the window is pointing - N, NE, E, SE, S, SW, W, or NW - to within a few degrees.
Your latitude and date
Combined with the window direction, latitude tells Planterra where the sun is in the sky right now, and where it'll be at every hour for the rest of the year. Solar geometry, not guesswork.
Your camera's exposure
When you take a light reading, Planterra corrects for the camera's ISO and shutter to convert scene brightness into lux - the same unit horticulturists use.
What "bright indirect light" actually means.
Care guides throw around phrases like "bright indirect" and "medium light" without ever giving a number. Below is the same idea in lux - and the plants that thrive at each level. Planterra measures the real value every time you point the phone.
Other plant apps stop at "put it near a window."
A quick, honest comparison. Every plant app can identify a Monstera. Only Planterra models the light your specific Monstera is actually getting.
| Capability | Planterra | Other plant apps |
|---|---|---|
| Reads window compass direction | ✓ | - |
| Tracks sun path over full year | ✓ | - |
| Per-room current lux estimate | ✓ | - |
| Generic species care sheet | ✓ | ✓ |
| Auto watering reminders | ✓ | ✓ |
| AI plant ID | ✓ | ✓ |
Map one window. See how it changes everything.
Free to try. No signup. About sixty seconds per window.
Get Planterra