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Subler vs MKVToolNix: catalog facts
Subler	MKVToolNix
Free Free to download from the project's GitHub releases.	Free Free and open source under the GPL 2.0.
macOS	Windows, macOS, Linux
Muxes tracks from MOV, MP4 and MKV into MP4 without re-encoding Creates TX3G and WebVTT subtitles that work on Apple devices	Adds, removes and retags tracks without re-encoding anything Header editor for fixing default track flags and languages
macOS only, requires macOS 10.13 or later Outputs MP4 only	Matroska output only Cannot change the video or audio encoding at all
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 21, 2026

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