KEV turns your iPhone or iPad into an accurate light meter. Point the camera and read the color temperature in Kelvin in real time — no extra hardware, calibrated against a Sekonic SpectroMaster.
As a cinematographer for over 20 years, I've been looking forever to replace my light meter with a digital one on my phone. I shoot primarily in LOG and color balance is key. This app has been amazing — highly recommend it.
Amazing. Astounding. You've set the bar. Back in the day I took a month of DSLR classes to master this skill — you broke it down and made it better with an iPhone, no less. I'm a customer for life.
The app does the job very well, saving a lot of time in post-processing. If you are a photographer or a videographer, you need this app. Recommended 👍
I needed a tool to set my video light color temperature to match the ambient light. This gets me close enough to a good value where the video looks far more natural.
I bought this for one problematic multi-source, low-light shot. KEV gave me a Kelvin number, I dialed it into my editor, and the result was exactly what I wanted. So nice 😊
Taking multiple measurements helps provide a range of reasonable white balance values and supports aesthetic judgement when processing RAW files.
KEV uses AI to analyze the live preview and hand you accurate white balance data instantly.
Point your camera and read the exact color temperature in Kelvin — live, the instant light changes.
On-device AI reads the preview and factors in the lighting for dependable readings.
Fine-tune white balance and tint, then calculate the exact correction on set.
Capture a frame stamped with its color temperature and location for your notes.
Pinch to 5× and focus manually to meter a precise, close-range spot.
Hot-shoe mount your iPhone over the camera and read color temperature straight from your wrist on the KEV Watch app — hands free while you shoot.
Replace a pocket light meter, a color temperature meter and a tint meter with your iPhone or iPad.
Live Kelvin readout for any light source — tungsten, daylight, LED, HMI, fluorescent, mixed scenes.
Read tint alongside Kelvin so you can correct ugly green LED or magenta cast in-camera, not in post.
A pocket light meter for photographers, videographers, gaffers and DPs — no Sekonic required.
Match the reading on your DSLR, mirrorless or cinema camera. Override Auto WB with a real number.
Skin tones, product shots, interiors — get true-to-eye color before you hit the shutter.
Lock matching white balance across shots and cameras. Save hours grading mismatched footage.
Balance ambient and key, gel for HMI to tungsten, dial in practical LEDs — fast.
Meter the scene with your phone, copy the Kelvin number into your drone or action camera.
No sensor, no calibration target, no guesswork. Your built-in camera already has you covered.
Aim your iPhone or iPad camera at the surface, subject or light source you want to measure.
KEV instantly shows the color temperature in Kelvin plus tint — balance ambient and key light with confidence.
Match the reading on your DSLR or cinema camera and nail white balance in-camera. Save hours in post.
Photographers and gaffers everywhere rely on KEV for color temperature and white balance.
White balance meter · color temperature · Kelvin meter · tint meter · light meter · lumen & exposure meter
白平衡 · 色温 · 光度计 · 开尔文计 · 植物灯计 · 测光表
色溫 · 白平衡 · 開爾文計 · 測光表 · 植物燈計 · 色彩溫度
色温度 · ホワイトバランス・メーター · 露光メーター · スペクトロメーター
Баланс белого · цветовая температура · экспонометр · колориметр Кельвина
Fotómetro · temperatura de color · espectrómetro · medidor de balance de blancos
Real reviews and on-set demos from creators on YouTube and Instagram.
Short answers to the questions photographers, videographers and gaffers ask the most.
A white balance meter measures the color of light in a scene and tells you the color temperature in Kelvin (and tint), so you can set your camera's white balance to match. KEV does this in real time using your iPhone or iPad camera.
Color temperature is how warm or cool a light source looks, measured in Kelvin (K). Tungsten is roughly 2800-3200K (warm), daylight is around 5500K, and shade or overcast sky is 6000K+ (cool). Setting your camera's white balance to the Kelvin value of the light makes whites look white.
Install KEV, open the app and point your iPhone or iPad camera at the scene or light source. KEV uses AI to analyze the live preview and shows the color temperature in Kelvin (plus tint) in real time. No external sensor needed.
KEV was calibrated against a Sekonic C-700R-U SpectroMaster Color Meter and is rated 4.5★ by 1,000+ users on the App Store. Accuracy ranges from fair to near 100% depending on lighting conditions and your device's camera.
Yes. KEV reads tint (magenta/green shift) alongside Kelvin, so you can correct green LED or magenta cast in-camera instead of fixing it in post.
Yes. KEV is used by videographers, cinematographers and gaffers to balance ambient and key light, match white balance across cameras, gel HMI to tungsten and dial in practical LEDs — saving time in post-production.
For midday sun on a clear day, around 5500K is the standard "daylight" reference. For shade or overcast skies, use 6500-7500K. KEV gives you the exact Kelvin number for the scene you're actually in.
KEV is a one-time purchase of $2.99 on the App Store — no ads, no subscriptions, no in-app purchases. Buy it once and use it on your iPhone, iPad and Apple Watch.
Join hundreds of photographers and videographers metering color temperature the smart way.