Change over time gets a line
Lines carry direction and rate, which is what a trend question is actually asking. Each series is labelled at its end, so identity never rests on colour alone.
Tools · Data
CSV to charts
Drop in a spreadsheet export and get a trend line and a ranked comparison. Pick which columns mean what — the tool guesses first, and it is usually right.
The file stays in your browser.
It is read and charted on your own machine; nothing is uploaded. With usage logging on,
the column headers and row count are kept — never the rows.
Drop a CSV here, or click to choose
Needs a header row · under 5 MB
Why these two charts
The shape follows the question.
Comparison gets ranked bars
Not a pie. Angle is the hardest encoding for people to compare and length is the easiest — ranked bars answer "which is biggest, and by how much" directly.
The palette is verified, not chosen
The series colours were checked against simulated colour vision deficiency rather than picked by eye. The worst pair separates well clear of the threshold.
The same charts come out of a matplotlib script in the automations collection, if you would rather generate them on a schedule.