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Have you used an SSTV decoding application on an up-to-date version of macOS? Which one, and if you built from source, can you share the steps you took to do so?

I do not know of a single working macOS application for SSTV decoding. I've been playing SSTV signals over my Mac's speakers, captured with my RTL-SDR dongle, and using Robo36 on an Android phone to decode the image, as has everyone else I know, but this comes with additional problems. There have been instances of engine-noise (or even the occasional donkey bray) introducing unwanted artifacts in the decoded image.

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    $\begingroup$ There's no rule written down that says so, but in my own opinion as a moderator, "does this software even (usably) exist" is a reasonable question because it's "is it possible to do this" not "choose the best one of these" — the problem with recommendation questions is that there are too many answers which are mostly "yes, X is the best" — they can't be ranked on quality of explanation. That said, might I suggest reframing your question slightly as "How can I decode SSTV with only MacOS software?" $\endgroup$
    – Kevin Reid AG6YO
    Commented Aug 2, 2019 at 15:37

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MultiScan 3B works fine in terms of decoding. This being said I had some issues making it work with my external sound card for transmitting SSTV. For some reason transmitted images turned out to be cropped. I accidentally figured this out using cqsstv.com.

Eventually I ended up using a Linux laptop and QSSTV software. Still if you are interested only in decoding, MultiScan 3B should be OK.

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I've been able to make Multiscan 3B SSTV decoder work on my older iMac with High Sierra (together with RTL-SDR USB dongle, FM decoded using CubicSDR and audio routed using Audio Hijack).

MultiScan 3B unfortunately fails to aquire any Audio Inputs/Outputs on my Big Sur box (showing only Item 1, Item 2, Item 3 which seems like Interface Builder placeholders that were by developer expected to be refreshed before user clicks those, but nothing happens on Big Sur). Code is unfortunately not open-sourced so only author can help.

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    $\begingroup$ Hello and welcome to ham.stackexchange.com! Is the "mentioned SSTV decoder" Robo36 or MultiScan 3B? Please edit your question to clarify. $\endgroup$
    – rclocher3
    Commented May 26, 2021 at 16:41
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    $\begingroup$ An anonymous user submitted an edit to this post that changes "mentioned SSTV decoder" to "MultiScan 3B". I voted to reject the edit because the anonymous editor does not know the original author's intent for certain. To the anonymous user, I recommend that you register and earn 50 reputation points, and then you'll be able to comment on any post. It's more appropriate to make a comment than to edit a post to say something the original author didn't clearly say. $\endgroup$
    – rclocher3
    Commented May 28, 2021 at 22:58
  • $\begingroup$ @rclocher3, original comment deleted. never mind, I see the ambiguity. $\endgroup$
    – webmarc
    Commented Jun 1, 2021 at 17:07
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MMSSTV seems to work well if installed using Wine.

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    $\begingroup$ Running Windows software under WINE is not “with only macOS software”. Downvoted. $\endgroup$
    – Scott Earle
    Commented Dec 28, 2019 at 14:05
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    $\begingroup$ I hear you @ScottEarle, but when the options that the OP asked for are few, IMO sometimes the less-palatable options are worth mention. Although when I do it, I like to preface my post with language like "I know you asked for just macOS software, but there are alternatives that work, but aren't native macOS..." I understand how macOS fans are prickly about such things; as a Linux user I can get huffy myself when someone suggests using Windows software in WINE, but I have also resorted to doing exactly that when I didn't have a better alternative. $\endgroup$
    – rclocher3
    Commented May 26, 2021 at 16:55
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    $\begingroup$ Oh I agree, but when the question specifically says "with only macOS software", then WINE doesn't cut it. If the question was "how to do it on macOS", that is different. $\endgroup$
    – Scott Earle
    Commented May 27, 2021 at 1:20

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