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SMPlayer vs Clapper: catalog facts
SMPlayer	Clapper
Free Free and open source under the GPL 2.0.	Free Free and open source under GPL and LGPL licences.
Windows, macOS, Linux	Linux
Remembers position, audio track and subtitles per file mpv and MPlayer engines, so format coverage is excellent	Native GTK4 interface that fits GNOME GStreamer-based playback
The interface is dated Qt and skins only go so far Two engines means two sets of quirks when something misbehaves	Aimed at Linux and the GNOME desktop Format support depends on installed GStreamer plugins
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL and LGPL
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.