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Subler vs iSubtitle: catalog facts
Subler	iSubtitle
Free Free to download from the project's GitHub releases.	Paid Costs $19.99, with a demo download and a Mac App Store version.
macOS	macOS
Muxes tracks from MOV, MP4 and MKV into MP4 without re-encoding Creates TX3G and WebVTT subtitles that work on Apple devices	Soft subtitles that render cleanly at any resolution Supports SRT, ASS/SSA, STL and VTT input
macOS only, requires macOS 10.13 or later Outputs MP4 only	macOS only Aimed at the Apple TV app and Apple devices rather than other players
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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