Plant Light Meter
Help & frequently asked questions
Measure how much light reaches your plant and see which plants will thrive there — on your iPhone, with no account and no internet connection.
How to measure
- Lay the phone where the plant stands (or will stand), screen facing the light — the window, the lamp, the sky.
- Wait two or three seconds while the reading settles.
- Read the band: low light, medium, bright indirect or direct sun. That is what care labels use.
Questions
How accurate is it?
A phone camera is not a laboratory lux meter. The app reads the camera's automatic exposure and converts it to lux, the way a photographer's light meter works. Expect the number to be within the right band, not exact to the last hundred lux. That is also why the app leads with the band — it is the decision you actually make — and shows the number as an approximation.
Why the front camera?
A plant's leaves face the light. With the phone lying where the plant stands, screen up towards the window, the front camera sees what the leaves see.
Is a photo taken?
No. The camera runs only so that its exposure can settle; the app reads three numbers — aperture, shutter time and ISO — and nothing else. No image is kept or sent, and the camera switches off as soon as you leave the app.
What is DLI?
The daily light integral is the total light a spot receives over a day, in mol/m². Grow guides use it because a plant cares about the whole day, not a single moment. Enter how many hours the spot gets light and the app does the rest. Choose Grow light when measuring under an LED lamp: its spectrum gives fewer usable photons per lux than daylight.
Why do readings change during the day?
Because the light does. A spot can go from medium to bright indirect when the sun comes round. Saved spots keep every reading and rank the spot by its brightest one, so a single cloudy afternoon does not rule out a good window.
What does the free version include?
Measuring, the light band and the plants that suit it. Unlocking adds saved spots, the daily light integral and grow light mode. It is a one-time purchase, not a subscription.
I paid but everything is still locked
Open Settings in the app and tap Restore Purchase. Make sure you are signed in with the same Apple Account you bought with.
Can I get a refund?
Refunds are handled by Apple, not by us. Visit reportaproblem.apple.com and sign in with your Apple Account.
Still stuck?
Email hayriodabas@gmail.com with your iPhone model and what you were doing when the problem happened.