MacBrightness is a macOS utility designed to increase the display brightness of MacBook Pro models beyond the standard maximum set by the operating system. The app unlocks additional brightness range that the display hardware already supports for HDR content, allowing the screen to reach up to 1,600 nits in practice. This effectively doubles the peak brightness available under normal macOS control, making the screen more readable in direct sunlight or other bright outdoor environments. The app works system-wide, meaning the increased brightness applies to all applications and interfaces. The main features of MacBrightness include integration with the existing brightness keys on the Mac keyboard, so no new shortcuts or menu bar interactions are required. Users simply tap the brightness key a few more times to access the extended range. The app operates without noticeable CPU overhead and does not rely on low-level system hacks. It requires macOS 13 or later and does not require an account or any setup process. Upon first launch, MacBrightness opens in a split-screen mode that shows half of the display at the increased brightness level for side-by-side comparison, while the other half remains at the standard maximum. This split-screen mode is free to use indefinitely. Typical use cases involve working outdoors in sunny conditions, such as at a café table, park bench, balcony, or airport gate. The workflow is straightforward: download and open the app, which takes about thirty seconds. The split-screen preview appears automatically. Users then press the brightness key to extend the full screen to the higher brightness level. The app is intended for MacBook Pro users who need better screen visibility in bright ambient light without resorting to shading or moving indoors. The developer created MacBrightness after discovering that the MacBook Pro display could already output higher brightness but was artificially limited by macOS.