Biotic Plant Light Meter
Light meter for houseplants
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Find the right spot for your plant! Use your phone to measure your light, scan your room, and use data from NASA to watch the light shift in your space through the year.
"Bright, indirect light" means nothing until you can measure it.
Plant Light Meter turns your iPhone's camera into a horticultural light meter, so you can find out what a spot really gives, and whether the plant you want will grow there.
MEASURE ANY SPOT
Point the camera at the light and get a reading in foot-candles, PPFD, and DLI, the daily light total that decides whether a plant thrives or slowly declines. Readings come from the camera's exposure, the same physics a dedicated meter uses, calibrated per iPhone model.
CHECK A PLANT BEFORE YOU COMMIT
Pick a plant and see whether your spot suits it. When it doesn't, the app suggests plants that would do well there instead.
MAP A WHOLE ROOM
Scan your room and see daylight modelled across the floor: through your real windows, at your real latitude. No LiDAR? Tap the floor corners instead. Works on any iPhone.
SEE THE WHOLE YEAR
A south-facing window in June is a different room in December. The seasonal forecast shows how each spot changes month by month, so you can place a plant for the year rather than for today.
PUT PLANTS ON THE MAP
Drop a plant onto any spot and see how it would fare across the seasons — which months carry it, and which fall short.
Readings are estimates from your camera, not laboratory measurements. They're built for comparing one spot against another and matching plants to them, which is the question that actually matters.
Free. No account, no ads.
Made by Biotic Instruments.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Scan a room and the app now walks you straight into taking your first reading. The map tells you the moment it goes live.
New: after a few readings, the meter points you to the room scan, the best way to see how light falls across a whole room.
Small improvements throughout.
The developer, Biotic Instruments, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Contact Info
- Usage Data
- Diagnostics
- Surroundings
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Kynes Biotic Instruments, Inc.
- Size
- 31.5 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026