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Optimus Player vs KMPlayer: catalog facts
Optimus Player	KMPlayer
Paid Commercial app; see the developer's website for current pricing.	Free Free to download and use.
macOS	Windows, macOS
Plays 250+ formats via FFmpeg Color-accurate playback using macOS frameworks	Built-in codecs for most formats Plays 4K and 3D video
macOS only Closed source, unlike VLC or IINA	Closed source Little detail available from the official site about current features
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.