When you have a route selected on either the app or web platform, you can tap the Route Profile button (highlighted in the screenshots below).
You will then see the full elevation profile for that route. The profile also includes a colour-coded line to indicate the gradient of the slope, from 0° (light blue) to 90° (dark purple).
On the app, you can drag the scrubber along the line to show you the distance from the start, elevation and gradient at that point (you can do the same with your cursor on the web version). You will also see that a red circle is visible on the map that corresponds to point on the elevation profile.