The light meter.
An honest number, not a guess.
"Bright indirect light" means something different on every plant tag. Point your iPhone at any spot in your home and Planterra gives you a real lux reading - corrected for the camera's exposure - so you can compare it against what your plant actually needs.
Exposure correction, not a raw camera guess.
Point the camera
Hold your iPhone toward the spot you're checking - a shelf, a desk, the middle of a room. No special hardware, no accessories.
Exposure gets corrected
Cameras auto-adjust ISO and shutter speed to make everything look nicely lit - which hides the real brightness. Planterra reads those settings and reverses the correction to recover true scene luminance.
You get a lux number
The same unit horticulturists use in grow guides. Planterra compares it instantly against your plants' ideal ranges - no lookup required.
The same spot in your home, measured honestly.
Four real readings, four different verdicts. This is the gap between "it's near a window" and actually knowing what a plant is getting.
Stop guessing what "bright" means.
Free to try. No signup. About two seconds per reading.
Get Planterra