GelMate: Kelvin, Mireds, CTO

GelMate converts between Kelvin and mireds, computes the mired shift between any two colour temperatures, and finds the closest Rosco/Lee gel (CTO or CTB) or 2-gel stack to match.

WHAT IT KNOWS
- Full / 1/2 / 1/4 / 1/8 CTO (warms a daylight source toward tungsten)
- Full / 1/2 / 1/4 / 1/8 CTB (cools a tungsten source toward daylight)
- Best single-gel match for any mired shift
- Best 2-gel stack search across all combinations
- Common Kelvin presets: tungsten, halogen, fluorescent, daylight, overcast, shade, blue sky, LED, candle, sodium

WHY GELMATE
- Built for film and stage lighting, not just photography
- 100% offline, no account, no tracking
- One purchase, no ads