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iSubtitle vs Subler: catalog facts
iSubtitle	Subler
Paid Costs $19.99, with a demo download and a Mac App Store version.	Free Free to download from the project's GitHub releases.
macOS	macOS
Soft subtitles that render cleanly at any resolution Supports SRT, ASS/SSA, STL and VTT input	Muxes tracks from MOV, MP4 and MKV into MP4 without re-encoding Creates TX3G and WebVTT subtitles that work on Apple devices
macOS only Aimed at the Apple TV app and Apple devices rather than other players	macOS only, requires macOS 10.13 or later Outputs MP4 only
Downloadable app	Downloadable app
Closed source	Open 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 2, 2026	Official website Full listing and sources Checked October 1, 2026

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