LightTemp

LightTemp turns your smartphone into a professional on-set measuring tool. Read the color temperature of any light source in real time - no expensive hardware required. Built by a filmmaker, for filmmakers. ◆ REAL-TIME KELVIN Point your camera at a light source and instantly read the Kelvin value. Tap the image to measure that exact spot (double-tap = center). ◆ TINT (GREEN / MAGENTA) Detect color casts from LED and fluorescent lights on the green-magenta axis. ◆ CALIBRATE TO YOUR DEVICE Calibrate LightTemp against a known reference value – so the reading matches your camera exactly. ◆ AUTOMATIC LIGHT SOURCE DETECTION The app recognizes Tungsten, LED, HMI, daylight, candlelight or fluorescent – including a flicker warning. ◆ PRO SCOPES • Histogram – brightness distribution • Waveform – luminance across the image width • RGB Parade – red/green/blue separately for a quick white-balance check ◆ FALSE COLOR & ZEBRA Exposure overlays like on professional monitors. False Color shows correct skin tones and clipping; Zebra marks overexposed areas with diagonal stripes. ◆ EXPOSURE ASSISTANT A live tip below the histogram – instantly tells you whether to open up or stop down. ◆ LIGHTING RATIO (KEY:FILL) Set the reference on the key light, aim the crosshair at the fill – LightTemp shows the brightness ratio in stops. ◆ GEL MATCHING Compare two light sources – the app recommends the right CTO/CTB gel to match them, plus a camera white-balance compromise. ◆ SHOT MATCH Save a scene's lighting and reproduce it exactly on the next shooting day. ◆ GOLDEN & BLUE HOUR Calculates the sun's position from your location with a countdown to the next phase. ◆ MORE TOOLS • Live camera data: ISO, shutter, aperture, FPS • Pinch-to-zoom with indicator • Freeze function to lock the value • Export log & scenes as PDF • Kelvin alarm (vibrates at target value) • Four languages: English, German, French, Spanish PRIVACY All data stays on your device. No accounts, no tracking, no ads. Note: Accuracy depends on your device's camera. Use the calibration for best results. LightTemp is an assistive tool and does not replace a calibrated hardware light meter for the most demanding use.