MAKO has been released as a Decky plugin in version 4.5.0, codenamed “Maelstrom”.

MAKO is a Vulkan layer solution for the Steam Deck that provides frame generation, upscaling, shader effects and adaptive frame rate targets for games.

New features include experimental HDR, separate settings for handheld and docked mode, and support for custom ReShade shaders.

Release Codename: Maelstrom

• Experimental HDR: HDR10/PQ and linear scRGB now work with Scaling, Frame Generation and Shaders, with Quality, Balanced, and Performance modes.
• AC/Battery Settings: Enable separate Handheld and Docked settings for each profile, with automatic switching based on power state.
• Display Refresh Rate Matching: Adaptive mode can follow Gamescope’s current refresh rate instead of a fixed target.
• Custom Shaders: Add compatible ReShade .fx files, then select and order them alongside bundled effects.
• Optional Lossless Scaling: MAKO Scaler and Shaders work through the installed Renderer without it.
• Native Steam Remote Play: Stream to native x86_64 Linux Steam clients using selected profiles.
• Disable Steam Overlay: New per-profile performance control to potentially reduce stutter.
• Improved Stability: Enhanced window-mode, frame pacing, and Flatpak support including Freedesktop 26.08 extensions.
• Localization: German and Russian interfaces added; improved Japanese translations.

Source: GitHub