The keyword heatmap
One row per keyword, one column per capture, coloured by position. A keyword you are losing shows up as a change of colour before you look at any number.
Averages hide the thing you need to see. A stable average position can be two keywords improving and two collapsing. The heatmap is where that becomes visible.
You find it in the Performance tab of a product's drilldown, and for your own product in the My Product tab of a market.
How to read it
Each row is one keyword, each column one capture. The colour of a cell is the product's position in that capture: strong positions in one colour, weak ones in the other, and an empty cell where the product was not on page 1. Hover a cell for the exact value.
You are not reading values, you are reading shape. A row that fades from strong to weak over two weeks is a keyword you are losing. A row that is patchy rather than coloured is a keyword the product ranks on only some of the time, which an average reports as a middling position and which is really a different problem.
The switch above the grid shows Position, JR Score or Visibility per cell instead.
The columns
On the left, each keyword with its latest position, its average position with the change against the previous period, its visibility and its JustRanks Score. Sort by any of them; sorting by the change is the fastest way to find what moved.
To the right, the captures. A column covers two days where keywords were captured every two days ("Sep 27–28") and one day where they were captured daily ("Oct 2"). When a market switches to daily captures, a thin line marks the first daily column: "Tracked daily from here". Over periods longer than 60 days, each column is a week.
The newest column fills up during the night. Until every keyword has been captured it reads "In progress", and keywords still waiting say "Next capture: tonight". When the period runs up to today and there is little history yet, the coming captures are shown as empty columns, so you can see the timeline fill up.