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Subler vs GPAC: catalog facts
Subler	GPAC
Free Free to download from the project's GitHub releases.	Free Free and open source.
macOS	Windows, macOS, Linux, Command line
Muxes tracks from MOV, MP4 and MKV into MP4 without re-encoding Creates TX3G and WebVTT subtitles that work on Apple devices	MP4Box gives fine control over MP4 muxing and demuxing DASH and HLS packaging with low-latency support
macOS only, requires macOS 10.13 or later Outputs MP4 only	Mainly command-line driven, with a steep learning curve Aimed at streaming workflows rather than editing
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
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 October 1, 2026

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