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Re:Ask HN: How do you keep up with replies to comment thread... by MeneerFriet on Sunday April 10, 2022 @12:38PM (#30978780)
I made a Safari extension (iOS/Mac) that highlights new comments: https://apps.apple.com/us/app/hn-comments/id1602932281 It's for new comments in general though, not exactly what you're asking.

Not much interest so far. Maybe the price is too high? Since I made it primarily for myself there's at least one happy user.

Re:Ask HN: How do you keep up with replies to comment thread... by cebert on Sunday April 10, 2022 @01:31PM (#30979422)
It may just be a discovery issue. I hadn’t heard of your app before you mentioned it here.