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Best Sunlight Meter Apps

250+ iOS apps curated and reviewed

4.6 avg rating
20 free apps
Updated August 2026

With an average user rating of 4.6★, the sunlight meter category is one of the App Store's strongest. Browse all 250+ apps we track, sorted so the most loved ones surface first.

Compare top Sunlight Meter Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Photone - Grow Light MeterPhotone - Grow Light MeterFree4.6★ (4.9K)NoYesAug 2026
2Light Meter LM-3000Light Meter LM-3000Free4.5★ (2.5K)NoYesAug 2026
3Lux Light Meter for MobileLux Light Meter for MobileFree4.5★ (229)YesYesAug 2026
4Bask Light MeterBask Light MeterFree5.0★ (2)NoNoAug 2026
5Candela: Light MeterCandela: Light MeterFree——NoJul 2026
6Libre Light SensorLibre Light SensorFree4.8★ (113)NoNoAug 2026
7Sensors Toolbox - MultitoolSensors Toolbox - MultitoolFree4.2★ (134)YesNoAug 2026
8Lux Light Meter & PhotometerLux Light Meter & PhotometerFree4.8★ (196)YesYesAug 2026

Top Picks for Sunlight Meter

Photone - Grow Light Meter#1

Photone - Grow Light Meter by Lightray Innovation GmbH

Perfectly light your plants!
Editor's Choice
🔧 Utilities
4.6😐(4.9K ratings)
FreeIn-App Purchases
Photone - Grow Light Meter screenshot 1
Photone - Grow Light Meter screenshot 2
Photone - Grow Light Meter screenshot 3
Photone - Grow Light Meter screenshot 4
Photone - Grow Light Meter screenshot 5
Photone - Grow Light Meter screenshot 6

This app acts as a professional-grade light meter for plants, measuring PAR, PPFD, DLI, and more using your device's camera. It helps optimize plant lighting by providing accurate readings and in-app guides, with optional advanced features available through purchase.

What We Love

  • 🚀 Accurate readings
  • 💡 Helpful for growing plants
  • 👍 Easy to use
  • 🚀 Saves money compared to expensive meters

Room to Improve

  • 🐛 Inconsistent readings
  • 💰 Expensive in-app purchases
  • 🔒 Requires additional equipment (diffuser) to work properly
Light Meter LM-3000#2

Light Meter LM-3000 by Lightray Innovation GmbH

Simple & accurate measurement!
Strong Contender
🔧 Utilities
4.5😐(2.5K ratings)
FreeIn-App Purchases
Light Meter LM-3000 screenshot 1
Light Meter LM-3000 screenshot 2
Light Meter LM-3000 screenshot 3
Light Meter LM-3000 screenshot 4

Transform your smartphone into a professional light meter. Measure illuminance and color temperature with scientifically validated accuracy, trusted by professionals. Requires a simple diffuser for precise readings.

What We Love

  • 👍 Great app
  • 👍 Accurate measurements
  • 👍 Easy to use
  • 👍 Helpful customer service

Room to Improve

  • 🐛 Requires diffuser for accurate readings
  • 💰 Expensive for a light meter app
  • 🔋 Battery/trial period issues
Lux Light Meter for Mobile#3

Lux Light Meter for Mobile by WeBrain

Lux-Meter & Exposure Measure
Worth Considering
🔧 Utilities
4.5(229 ratings)
FreeAdsIn-App Purchases
Lux Light Meter for Mobile screenshot 1
Lux Light Meter for Mobile screenshot 2
Lux Light Meter for Mobile screenshot 3
Lux Light Meter for Mobile screenshot 4

This app provides accurate and easy-to-use light measurements in lux and foot candles. It's ideal for photographers, plant owners, and anyone needing to assess ambient light levels in various spaces. Features include real-time color temperature measurement and calculation of the daily light integral.

More Sunlight Meter apps to explore

4
Bask Light Meter
Bask Light Meter
Bask Light Meter
Measure light for your plants
Free

This app uses your device's camera to measure sunlight intensity. It helps you determine the best locations in your home for your houseplants to receive optimal light for growth.

Measure sunlight with cameraOptimize plant placementSupports houseplants
🌟 Lifestyle
(2)
free
5
Candela: Light Meter
Candela: Light Meter
Candela: Light Meter
by Snizhana Babytska
Free
🔧 Utilities
(0)
6
Libre Light Sensor
Libre Light Sensor
Libre Light Sensor
Measure Light in Lux
Free

Measure ambient light levels in Lux using your iPhone's camera. Optimize sleep quality by understanding light exposure throughout the day and night.

Measure light in LuxUtilizes iPhone cameraOptimize sleep quality
🔧 Utilities
(113)
free
7
Sensors Toolbox - Multitool
Sensors Toolbox - Multitool
Sensors Toolbox - Multitool
by Andrew Neal
Free

Access and visualize data from all your smartphone's sensors in real time. Collect information from accelerometers, gyroscopes, GPS, barometers, and more, then convert it into easy-to-read graphs. This app offers a clean, intuitive interface for comprehensive sensor analysis.

Real-time sensor data collectionAccelerometer, gyroscope, GPSBarometer, decibel meter, metal detector
🔧 Utilities
(134)
ad-supported
8
Lux Light Meter & Photometer
Lux Light Meter & Photometer
Lux Light Meter & Photometer
Lightmeter for Photo & Plant
Free

Measure light intensity and color temperature for photography, plant care, and workspace optimization. Offers real-time readings, shooting recommendations, and manual control for precise lighting adjustments.

Real-time color temperature readingsLux and Foot Candle measurementsAverage and Max light values
🔧 Utilities
(196)
free with in-app purchases
9
LUX Meter - Photo Light Meter
LUX Meter - Photo Light Meter
LUX Meter - Photo Light Meter
Measure light for photoshoot
Free

This utility app precisely measures light intensity in LUX and color temperature in Kelvin. It provides real-time exposure readings for photoshoots and filming, helping users adjust lighting for optimal results.

Real-time color temperature measurementLight measurement in LUXReal-time heat measurement (Kelvin)
🔧 Utilities
(1)
free with in-app purchases
10
Lux Light Meter Pro
Lux Light Meter Pro
Lux Light Meter Pro
Measure Luminosity in Lux & FC
Free

Measure light intensity in lux and foot candles with this 2-in-1 meter. Optimize photography settings, adjust indoor lighting, or prevent eye strain with professional-quality readings directly from your smartphone.

Real-time lux and foot candle measurementsReal-time color temperature measurementsReal-time histogram plotting
🔧 Utilities
(5.1K)
free with in-app purchases
11
Luminosys - Light Meter
Luminosys - Light Meter
Luminosys - Light Meter
A simple, powerful light meter
Free

Accurately measure ambient light levels in Lux or Foot Candles using your phone's camera. This tool is ideal for photography, comparing light sources, or indoor gardening. It's designed for ease of use and provides precise readings.

Measures light in LuxMeasures light in Foot Candles (FC)Uses phone camera for accuracy
🔧 Utilities
(7)
ad-supported
12
LUX Meter - Light Meter
LUX Meter - Light Meter
LUX Meter - Light Meter
Illuminance for photo & plants
Free

This app measures ambient light levels in lux or foot-candles using your iPhone camera. It provides instant feedback on whether a space is too dim, comfortable, or bright enough for various tasks and offers calibration options.

Lux and foot-candle readingsLighting target presetsLive brightness scale
🔧 Utilities
(1)
free
13
PPFD METER - Grow Light Meter
PPFD METER - Grow Light Meter
PPFD METER - Grow Light Meter
LUX, PAR, PPFD, DLI & PAR Maps
Free

This app measures light intensity for plants, converting LUX to PPFD and DLI. It offers advanced light mapping, uniformity analysis, and efficiency insights to optimize plant growth. Customize profiles for different environments and growth stages.

LUX, PPFD, DLI, and PAR measurementsLight mapping and distribution analysisUniformity and PPF evaluation
🔧 Utilities
(87)
free with in-app purchases
14
Light Meter: Lux & Plants
Light Meter: Lux & Plants
Light Meter: Lux & Plants
Measure Ambient Brightness
Free

This app transforms your phone into an ambient light meter, providing instant lux readings with clear, easy-to-understand interpretations for plants, desks, and rooms. It allows for side-by-side comparisons of different light spots and saves results for later review.

Instant lux and foot-candle readingsContextual interpretations for plants, desks, and photographySide-by-side spot comparisons
🔧 Utilities
(5)
free with in-app purchases
15
Lux Light Meter · Photometer
Lux Light Meter · Photometer
Lux Light Meter · Photometer
Lux · EV · Modes · History
Free

This tool transforms your iPhone into a precise light meter, offering multiple modes for various environments and photography needs. It records measurement history, allows for notes and comparisons, and supports CSV export for detailed analysis.

Precise ambient light measurement (lux)Multiple measurement modes (Auto, Outdoor, Indoor, Photo)Measurement history with trend charts
🔧 Utilities
(4)
ad-supported
16
LightMeter Pro: Lux Meter
LightMeter Pro: Lux Meter
LightMeter Pro: Lux Meter
Exposure, PPFD & AI Analysis
Free
🔧 Utilities
(0)
17
Sunlight Reminder for Health
Sunlight Reminder for Health
Sunlight Reminder for Health
Sunlight logs with light meter
Free
💪 Health & Fitness
(0)
18
Luxmeter - Lux Light Meter
Luxmeter - Lux Light Meter
Luxmeter - Lux Light Meter
Measure Lux Light & Exposure
Free

This app measures light intensity in lux and provides real-time exposure suggestions for photography. It offers customizable settings for shutter speed, aperture, and ISO, with options for both front and back cameras. It's designed for personal use to optimize lighting and capture better photos.

Light intensity measurement (lux, foot-candles)Real-time color temperature readingsExposure suggestions
🔧 Utilities
(208)
free with in-app purchases
19
Light Meter: Film Photography
Light Meter: Film Photography
Light Meter: Film Photography
Exposure, incident & spot EV
Free
📷 Photo & Video
(0)
20
Light Meter.
Light Meter.
Light Meter.
by Muhammed Efdal incesu
Free
🔧 Utilities
(0)

FAQ about Sunlight Meter

What are the best sunlight meter apps for iPhone?
Photone - Grow Light Meter tops our sunlight meter apps ranking as of August 2026, with a 4.6-star average from 4.9K App Store ratings, and it's free to download.
Yes — 20 of the top sunlight meter apps we rank are free to download, including Photone - Grow Light Meter and Light Meter LM-3000.
Photone - Grow Light Meter has no ads and offers in-app purchases, according to its App Store listing as of August 2026.
We track 250+ sunlight meter apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.
Photone is a mobile application that functions as a highly accurate light meter for plants. It uses your device's camera to measure various light metrics such as PAR, PPFD, DLI, lux, foot-candles, and color temperature (kelvin). This data helps users understand and optimize the lighting conditions for their plants.
Key features include industry-leading accuracy comparable to professional PAR sensors, pre-calibration for your specific device, and excellent low light sensitivity. It also offers in-app guides, light source selection for different grow lights, and a hands-free 'read aloud' function. Some advanced features like Extended PAR and underwater measurement modes require an in-app purchase.