Popular blends how many people know the story with how well it is rated — compared with the rest of the catalog.
What feeds it
- Unique reader reach (biggest slice)
- Follows
- Rating quality — the public rating score tempered by how many ratings exist
- A smaller direct contribution from the star score itself once enough ratings land
Primary popular rails also expect minimum audience and rating counts before a title appears. Popularity refreshes with homepage and Collections snapshot jobs, so it can lag a day behind live reading. Momentum is the “this week” cousin if you need something more immediate.