If you use the web reader, they work just fine in any browser such as Safari. You can download them as EPUB files and open them in the Books app if running Ventura. When I briefly tried this on my 2013 Air it worked reasonably well. Speech Central can read them, though I haven't used the Mac version since 2017 or so. I've been told VoiceDream Reader for Mac also works, but I haven't tried it. macOS isn't my primary operating system anymore.
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Multiple Ways
If you use the web reader, they work just fine in any browser such as Safari. You can download them as EPUB files and open them in the Books app if running Ventura. When I briefly tried this on my 2013 Air it worked reasonably well. Speech Central can read them, though I haven't used the Mac version since 2017 or so. I've been told VoiceDream Reader for Mac also works, but I haven't tried it. macOS isn't my primary operating system anymore.