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

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