A new open-source Windows utility called Smart HDR Manager automatically activates high dynamic range when compatible content launches and deactivates it afterward. Developed by a programmer using the handle VantaCode420, the tool was shared on Reddit after the creator noted frequent manual toggling of HDR settings on OLED displays. The application runs from the system tray and detects when games from Steam, Epic Games Store, GOG, or Xbox libraries start, enabling HDR only for those programs. It also supports HDR playback on YouTube and in media players such as VLC, mpv, MPC-HC, and PotPlayer, provided a Tampermonkey script confirms an HDR stream. Integration with NVIDIA RTX Video HDR allows automatic HDR activation during video playback on supported GPUs. Features include per-monitor switching, adjustable delays, keyboard shortcuts, and safeguards against unintended toggles during OBS recording. The developer states the software operates locally without telemetry or administrator rights. Smart HDR Manager remains in beta, tested primarily on Windows 11 25H2 with an NVIDIA GeForce RTX 5070 Ti and a single HDR monitor. Compatibility with AMD and Intel hardware, older Windows versions, and multi-monitor setups has not been fully verified. The utility is available for free download from its GitHub Releases page, offering both standalone and .NET-dependent versions.