Screen Brightness Nits Meter
Measure the brightness of any screen, monitor, TV, or display using your smartphone camera
Turn your smartphone into a convenient and easy-to-use Nits Meter. Perfect for enthusiasts, professionals and anyone who needs quick screen brightness measurements.
Why Choose Our Nits Meter?
Reliable Measurements
Pre-calibrated for consistent readings, with built-in calibration feature for optimal accuracy on your specific device.
Easy to Use
Simply point your device's camera directly at a neutral white area of the screen you want to measure. Position perpendicular to the display, no more than a centimeter (half an inch) from the surface. For best accuracy, set the screen to D65 (6500K standard white) — other color temperature settings can affect measurements.
Versatile Applications
Perfect for TV and display technicians, video production professionals, gaming enthusiasts, home theater setups, office lighting consultants, photographers and videographers — and anyone curious about screen brightness levels.
Multiple Units
Supports Nits (cd/m²), Foot-Lambert, Stilb, Lambert, Apostilb, and cd/ft² for professional flexibility.
Excellent Value
Convenient screen brightness measurement without needing expensive dedicated equipment.
Understanding Screen Brightness
What is Screen Brightness?
Screen brightness, measured in nits (candela per square meter, cd/m²), indicates how much light a display emits. One nit equals one candela per square meter, providing a standardized way to measure luminance across TVs, monitors, smartphones, tablets, control panels, dashboards, and advertising screens. Accurate brightness measurement is essential for evaluating display quality, determining optimal viewing conditions, and ensuring proper screen calibration for professional work.
Typical Nits Values
Understanding typical brightness ranges helps you interpret your measurements:
- TVs — 150-400 nits for standard models, up to 3000+ nits for HDR/premium models
- Computer monitors — 250-400 nits for standard displays, 400-1000+ nits for graphic design and HDR content
- Laptops — 250-500 nits, up to 800 for premium models
- Smartphones — 400-800 nits typical, up to 3000+ nits peak
- Tablets — 300-600 nits typical
- Outdoor advertising screens — 2000-8000 nits
What is a good brightness?
What qualifies as good maximum brightness largely depends on the viewing environment. A 350-nit screen might look vibrant in a living room but appear dim and washed out in direct sunlight. When choosing brightness for your displays, this can serve as a guide:
- 300–500 nits — indoor applications like control panels, office displays, and consumer electronics in ambient lighting
- 500–1000 nits — bright indoor environments or semi-outdoor spaces like retail displays near windows
- 1000–5000 nits — outdoor displays or high-ambient-light settings like vehicle dashboards
- 5000–8000 nits — outdoor advertising screens with strong visibility under all weather conditions
Nits vs Lux vs Lumens
Simply put: Nits measure how bright something appears to your eyes, while Lux measures how much light illuminates a surface. For a complete lighting analysis, use both together — measure ambient lux with our Lux Meter app, then measure display nits to ensure optimal viewing conditions. Understanding different light measurements helps you choose the right tool for your specific needs:
- Nits (Luminance) — measures light emitted or reflected from a surface per unit area (cd/m²)
- Lux (Illuminance) — measures light falling onto a surface from all directions (lm/m²)
- Lumens (Luminous Flux) — measures total light output from a source in all directions (commonly used for bulbs and lamps)
Why Measure Nits?
Nits measurements are essential for optimizing visual experiences and ensuring proper display performance across many applications:
- Ergonomics — preventing eye strain by matching brightness to ambient lighting
- Display calibration — establishing proper brightness levels for accurate viewing
- Professional photo/video work — ensuring precise color grading and HDR content creation with accurate luminance values
- Accessibility — maintaining sufficient contrast for users with visual impairments or low vision
- Energy efficiency — optimizing brightness to extend battery life and reduce power consumption
- Quality assessment — comparing display specifications and evaluating performance across devices
- Home entertainment — determining optimal TV brightness for comfortable viewing under varying ambient light
- Multi-display setups — ensuring consistent brightness across multiple screens
- Outdoor readability — testing smartphone and tablet visibility in bright outdoor conditions
- Automotive & marine applications — verifying dashboard displays are readable in bright daylight while remaining non-distracting at night
Key Features
📏 Real-Time Luminance Measurements in Nits
Get instant, continuous luminance measurements displayed in nits (cd/m²) in real-time. The app continuously updates brightness values as you point your camera at different screens, providing immediate feedback for quick assessments. The real-time nature makes it perfect for comparing different display settings, evaluating brightness uniformity across a screen, or quickly checking multiple devices.
✅ Pre-Calibrated
The app comes pre-calibrated to provide fairly reliable and consistent brightness measurements right out of the box. No complex setup required - simply download the app and start measuring. The default calibration works well for relative measurements. For absolute measurements, calibration is preferred.
🎯 Built-In Calibration Feature
For users who demand maximum precision, the app includes a comprehensive calibration feature that optimizes accuracy for your specific smartphone or tablet. By calibrating with a known reference display or light source, you can fine-tune the measurements to compensate for variations between different camera sensors. This optional calibration ensures you get the most accurate possible readings from your particular device.
🔄 Multiple Measurement Units
Professional flexibility with support for six different luminance units: Nits (cd/m²), Foot-Lambert (fL), Stilb (sb), Lambert (L), Apostilb (asb), and candela per square foot (cd/ft²). Switch instantly between units to match your industry standards, regional preferences, or project requirements.
💾 Save Measurements with Notes
Never lose track of important measurements. Save any reading with a single tap, automatically capturing the measured luminance value, date, and time. Add custom notes to each saved measurement to record context like display model, settings used, viewing conditions, or any other relevant information. Perfect for tracking brightness degradation over time, documenting display configurations, comparing different devices, or maintaining records calibration work.
📖 Detailed Documentation and Help
Comprehensive in-app documentation ensures you get the most from your measurements. Access detailed explanations of luminance measurement concepts, step-by-step measurement instructions, best practices for accurate readings, troubleshooting guidance, and calibration procedures.
⚙️ Customizable Settings
Tailor the app to your specific needs and preferences with the customization options. This includes date and time format, keep screen on, high contrast mode, language, measurement units and more.
📺 Works with All Display Types
Universal compatibility with every modern display technology ensures you can measure any screen you encounter. The app accurately measures LCD displays (IPS, TN, VA panels), OLED and AMOLED screens (smartphones, TVs, monitors), LED displays and video walls, HDR-capable displays (HDR10, Dolby Vision), QLED quantum dot displays, MicroLED displays, and even older display technologies. Whether measuring a laptop screen, smartphone display, television, gaming monitor, professional reference monitor, projector screen, or digital signage, the app provides reliable luminance measurements across all display types.
👆 Simple Point-and-Measure Operation
Effortless measurements with an intuitive, streamlined workflow. Simply open the app, point your smartphone camera directly at the screen you want to measure (positioning perpendicular to the display surface at close range for best results), and instantly see the brightness reading. The straightforward point-and-measure approach makes screen brightness measurement accessible to everyone, from display enthusiasts and gamers to AV technicians.
Why Are My Measurements Lower Than Expected?
If your measured nits are lower than the manufacturer's stated maximum brightness, there are several reasons why a screen rarely reaches its advertised peak brightness during measurement:
Peak vs Sustained Brightness
Manufacturers often advertise peak brightness, which the display can only achieve for brief moments in small highlight areas. The sustained full-screen brightness is typically 30–60% lower.
Automatic Brightness Limiting (ABL)
Most OLED and many LED displays automatically reduce overall brightness when a large portion of the screen is bright. A white test screen will measure significantly lower than a small white patch on a dark background.
Auto-Brightness and Ambient Light Sensors
Many devices adjust brightness based on surrounding light. Even at the "maximum" slider position, some devices still allow the sensor to limit brightness unless auto-brightness is explicitly disabled in settings.
Thermal Throttling
Displays generate heat at high brightness. After a few minutes, the device may reduce brightness to manage temperature, even if the brightness slider remains at maximum.
Power Saving and Battery Management
Battery saver modes, eco modes, and low battery states can silently cap display brightness far below the maximum.
Software Overlays and Filters
Night mode, blue light filters (Night Shift, Eye Comfort), True Tone, and similar features reduce brightness and shift color temperature, lowering measured nits.
HDR vs SDR Mode
Advertised peak brightness often refers to HDR mode with specific high-contrast content. In standard SDR mode, the display typically operates at a much lower brightness ceiling.
Display Age and Wear
OLED screens gradually lose brightness over their lifespan. An older display may no longer reach the brightness levels it achieved when new.
Color Temperature Setting
A warm (yellowish) white point produces fewer nits than a cool (bluish) white at the same backlight level. Measure with D65 (6500K) for comparable results.
Exaggerated Claims
Lastly some manufacturers might exaggerate their screen brightness values.
To get the highest possible reading, try disabling auto-brightness, turning off all power saving modes and night filters, displaying a small white patch on a black background (to avoid ABL), and allowing the screen to warm up briefly before measuring.
Measurement Best Practices
To maximize measurement accuracy, follow these best practices:
- Point your camera at a neutral white area of the screen
- Ensure the screen is set to D65 (6500K standard white) — other color temperature settings may significantly affect measurement accuracy
- Position your device perpendicular to the screen surface
- Maintain a close distance of no more than a centimeter or half an inch from the screen
- Allow displays to warm up for a few minutes before measuring
- Ensure your device's camera lens is unobstructed and clean
- Measure in dim ambient lighting to reduce interference
- Be aware that most screens have uneven brightness throughout their area — take multiple readings from different spots for a complete assessment
- Calibrate the app for your specific device when absolute accuracy matters
Relative vs Absolute Accuracy
For relative measurements — comparing brightness between different screens, or between different areas of the same screen using the same device — the results are especially reliable. For absolute accuracy, calibrate the app against a known reference display and consider measurements as good approximations rather than laboratory-grade precision.
Great for Display Enthusiasts
Whether you're adjusting your gaming monitor, setting up your home theater, or just curious about display brightness, our Nits Meter provides useful brightness readings to help optimize your viewing experience. Helpful for understanding HDR, OLED, and other display technologies.
Measures Any Screen Type
Works with all display technologies including LCD, OLED, LED, HDR, QLED, and AMOLED displays. Perfect for TVs, computer monitors, smartphones, tablets, and professional displays.
Handy Features
Save measurements with notes, access comprehensive documentation, and use the built-in calibration feature for optimal readings for your specific device.
Frequently Asked Questions
Can I measure OLED displays accurately?
Yes, but OLED displays can show different brightness levels across the screen due to how individual pixels emit light. For a complete assessment, take multiple measurements from different areas of the display rather than relying on a single reading.
What's the difference between peak and sustained brightness?
Peak brightness is the maximum a display can achieve briefly in small highlight areas, while sustained brightness is what it can maintain continuously across the full screen. This app measures the current actual brightness the display is producing. See "Why Are My Measurements Lower Than Expected?" above for details on why peak values are rarely reached in practice.
Why should I set my screen to D65 before measuring?
D65 (6500K standard white) is the reference white point for display measurements. A warm (yellowish) white point produces fewer nits than a cool (bluish) white at the same backlight level, so measuring at D65 ensures your readings are comparable to manufacturer specifications and to other screens.
I reinstalled the app, how do I get full access again?
Go to the Settings tab, select "Get Full Access," then tap the "Restore Purchase" link in the middle of the page.
What Users are Saying in Official Reviews
"The best nit measurement app right now. This is incredible how accurate this app works i compared with a colorimeter display pro hl and it was 1 to 1 measurement 100% recommend."
"Your app actually works with my phone and monitor nits are displayed properly."
"Initially, this app was unavailable for my phone. I emailed the developer who responded immediately and looked in to the issue. The app was made available for my phone within a few days, and after installing I found it highly useful and accurate - the readings on test images returned results very similar to those published in reviews using professional equipment. So 5 stars for the app and 10 stars for the support from the developer. A rare and precious thing."
"Helped with science fair. Amazing, helped with a light project for school."
"Great App, Saves You a Measuring Device. The app is great, it allows for a rough adjustment of brightness for image editing. Anyone who wants to know exactly needs to use a spectral radiometer, but the achievable accuracy is more than sufficient for me."
"This app is desperately needed."
"It helps a lot to compare laptop screen brightness."
"Tested with some laptop screens and computer monitors and it matches the hardware specs. This using an iPhone 15 Pro Max. Slide brightness up and down 3 or 4 times to get a better reading."
Need Help or Have Ideas?
We're committed to making this app the best it can be. Your feedback matters to us, and we personally respond to every user who contacts us. Whether you have questions, need support, or have ideas for new features, please reach out to us at [email protected]
Wide Language Support
The app has full support for 40 different languages, making measurement accessible worldwide.
Download the Screen Brightness Nits Meter app now
Enjoy full functionality for a few weeks. After that, choose a one-time fee or subscription — still at a fraction of the cost of a dedicated color temperature meter device.