A beautiful light meter for everyone.

Thea is a free, beautifully simple light meter for iPhone—made for every kind of photographer, anywhere you shoot.

No clutter. No confusion. Just a clean, minimal design that helps you focus on creating great photos.

Your phone is always with you—so is Thea. Get quick, accurate readings anywhere you shoot.

Thea uses your iPhone's camera to deliver real-time exposure readings—so you can shoot with confidence.

Loved by photographers of all kinds

Whether you're shooting city streets, medium format film, or just getting started—Thea was built to be simple, beautiful, and useful for everyone.

"As a street photographer, I need to move quick. Thea gives me accurate readings in seconds, without any fuss."

Jordan R. - Street Photographer

"I shoot mostly 35mm and Thea has replaced my handheld meter. It's accurate, easy to use, and always with me."

Lena M. - Film Photographer

"I'm not a pro—I just love taking photos. Thea's design is so clean and intuitive, I actually enjoy metering now."

Sam D. - Amateur Photographer

A simple, beautiful light meter built for photographers of all levels. No ads, no cost—just a tool to help you shoot with confidence.