I built Lumos because I was tired of manually cranking my brightness down every time I opened a bright doc, then back up for my dark-themed editor. What it does: Lumos watches your screen content and adjusts backlight in real time to keep perceived brightness consistent — dim for bright pages, bright for dark editors. It's not just a fixed rule either: every time you manually adjust brightness, Lumos remembers what you wanted for that kind of content and refines its curve. A few noteable features: - 100% local — no telemetry, no cloud processing, nothing transmitted - Per-app pause, so brightness stays fixed for video players, photo editors, etc. - Independent brightness memory per display (built-in + external via DDC/CI) - Free and fully open source (MIT) Requirements: Apple Silicon Mac, macOS 14+, and Screen Recording permission (used only to measure perceptual brightness, not to view/store anything). Install via Homebrew or grab the DMG from the GitHub releases. Would love feedback, bug reports, or feature ideas — I'm actively building this and reading every comment today!

Lumos

Content-adaptive display brightness for macOS

Content-adaptive display brightness for macOS