- Why is Live Captions missing when my Mac is in a supported language?
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Because the two lists are different, and because Apple's list depends on the macOS version. On Sonoma and Sequoia its guide offers Live Captions only with the system language set to English (U.S.) or English (Canada), so a Mac running in French has no row at all. On Tahoe, French is on the list, for France and Canada, but Apple gates the feature on country or region as well as language, so a covered language can still be missing where you are.
- Can I add a language to Live Captions?
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No. There is nothing to download and no setting to change; the list is whatever your macOS version offers in your region. Changing the Mac's language or region to force it is not worth doing, because it moves the App Store, Siri and a dozen other things with it.
- Which languages does this app caption?
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Sixteen: English, Spanish, French, Italian, Portuguese, German, Dutch, Turkish, Russian, Arabic, Hindi, Japanese, Korean, Vietnamese, Ukrainian and Mandarin. The same sixteen everywhere, with no region condition, and the language detected for you unless you name it.
- Does it caption two languages in one conversation?
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Not well. Detection settles on one language and stays there, which is the right behavior for a meeting in one language and the wrong one for a meeting that keeps switching. If you know it will switch, pick the language that carries most of the conversation rather than leaving it on Multilingual.
- Do I need a separate download per language?
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No, one download per pack. Six languages share the Latin-script pack at 583 MB and the other ten share the full-vocabulary one at 633 MB. Moving inside a pack is instant, and crossing between them happens once and then never again.
- Can it translate into a language it cannot caption?
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No. Translation runs on the captions, so both ends have to be among the sixteen. It goes from any of them into any other, which is 240 orderings, and it needs macOS 15 because Apple's translator does.
- Is it more accurate than Apple's in the languages both cover?
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There is no benchmark here that would let anyone answer that honestly, so this page does not claim it. What is measurable is the coverage: sixteen languages with no region condition, against a list Apple describes as not available in every language, country or region.