The new Netlflix film “Amanda Knox” hasn’t captivated viewers the way the Amanda Knox case did, according to a media research firm with a unique way of tracking who’s watching what.

Netflix famously refuses to release ratings. So Symphony Advanced Media uses its own panel of viewers, and tracks what they watch using cell phone audio recognition technology. The panelists’ cell phones, in other words, keep track of what they watch.

According to data provided by Symphony to TheWrap, “Knox” has earned a 0.3 rating in the adults 18-49 demographic and 382,000 viewers since it’s Sept. 30 premiere in live-plus-five ratings. That put it far behind Symphony’s numbers for “Making a Murderer,” which averaged a 0.8 rating and 1.1 million viewers in Symphony’s live-plus-five numbers.

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What does Netflix say about this? Nothing, of course. Since it does not release ratings for its shows, it declined TheWrap’s request for comment.

Viewers can’t binge-watch “Amanda Knox” because it is a single, 90-minute documentary, whereas shows like “Making a Murderer” feature multiple episodes. It currently has a very strong 90 percent on Rotten Tomatoes.

Twice convicted and twice acquitted by Italian courts of the brutal killing of her British roommate Meredith Kercher, Knox became the subject of global speculation as around-the-clock media attention fed the public’s fascination through every twist and turn of the near-decade-long case.