Chart type · Trend
Slope
A two-point before-and-after comparison per item.
How to read it
Two moments, one line per item. Direction is the story and steepness is the size of the change.
Best for
Change between exactly two moments, where who rose and who fell is the story.
When not to use it
The two endpoints are unrepresentative — a slope chart hides everything that happened between them.
The common mistake
Picking a start point that flatters the conclusion. With only two data points, the choice of dates is the argument.
Example data
Renewable energy is rising fast
Share of electricity from renewables, 2015 vs 2025
- 2015
- 2025
The sample dataset this format ships with, drawn the way the site draws every clip's numbers — hover, sort or step through it. Figures as given by its source line: Illustrative example data.
Examples
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Related chart types
- 1 reelLineAn animated line reveal for one or more series.
- No reels yetAreaA filled trend, optionally stacked or shown as shares of 100%.
- 3 reelsBar raceHorizontal bars reordering as values change across frames.
- 1 reelWaterfallStart, contributions, end: each step peels off a running total, and the payoff brackets how far the end landed from the start.
- No reels yetFunnelA true-width drop-off funnel: a stream of dots spills out at every step, a live counter falls stage by stage, and the leakiest step cracks open at the end.
- No reels yetScatterPoints revealed against two axes, with an optional fitted trendline, the gap to it for the story point, and a refit without that point.