By the time a trope is everywhere on BookTok, the market has already moved. Here's how to use Amazon chart data to get ahead of it instead.
By the time a trope is trending on BookTok, you're already late. The way most authors track trends, by scrolling reader groups, watching social, relying on newsletters, puts you several cycles behind the actual market. You're writing into a signal that's already been amplified, discussed, and diluted by the time it reaches you.
The market data tells you what's happening before any of that.
A popular trope has lots of books. A rising trope has momentum, reader demand is outpacing the supply right now. Those aren't the same thing, and the distinction matters enormously for timing.
The metric that captures this is 7-day velocity: how has the average chart position of books with this trope changed over the last week? A trope at +18 is moving up fast. A trope at −41 is losing chart share. Romintel's velocity engine calculates this every morning across 8 romance subgenres, so the numbers you're looking at reflect what's happening this week, not what was happening when someone wrote a newsletter about it.
Alongside velocity, Romintel tracks saturation, which shows whether a trope is Open (visible demand, few dominant books), Competitive (active but not closed to new entries), or Saturated (heavily contested). The strongest market signal is a trope that's both Open and Rising: reader demand is building and there's room for a new book to come in and find an audience.
A saturated trope isn't a reason not to write something, but it is a reason to know what you're walking into before you commit 80,000 words to it.
Go to romintel.com/dashboard, navigate to your subgenre, and look at the velocity table. Which tropes are rising right now? Which of those are Open rather than Saturated? That combination is your most current market signal, and it's updated every morning, not every quarter.
The Surprising Signal at the top of each subgenre card is also worth reading. It surfaces the one counterintuitive data point from that morning's scan and explains the behavioural economics behind it. Sometimes the most useful thing isn't what's trending but it's what's moving unexpectedly, and why.
See the data for yourself — free.
Open the dashboard →