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SMPlayer vs KMPlayer: catalog facts
SMPlayer	KMPlayer
Free Free and open source under the GPL 2.0.	Free Free to download and use.
Windows, macOS, Linux	Windows, macOS
Remembers position, audio track and subtitles per file mpv and MPlayer engines, so format coverage is excellent	Built-in codecs for most formats Plays 4K and 3D video
The interface is dated Qt and skins only go so far Two engines means two sets of quirks when something misbehaves	Closed source Little detail available from the official site about current features
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

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