HDR10+ is a royalty free HDR format that extends HDR10 with dynamic metadata. Instead of describing brightness and colour once for an entire film, as static HDR10 does, HDR10+ can adjust this guidance scene by scene, or even frame by frame, so the television has more precise instructions for how to render each moment.
In practice, this can help a television preserve highlight and shadow detail more consistently across a film that moves between very bright and very dark scenes, provided both the content and the television support HDR10+. Support has grown across some streaming services, 4K discs and television brands, though it is less universally adopted than plain HDR10, and it competes directly with the similar Dolby Vision format.
Because a television without HDR10+ support will still play HDR10+ content, just by falling back to its static HDR10 layer, missing HDR10+ support is not a dealbreaker on its own. Our HDR explained guide covers how the dynamic formats compare in everyday viewing.