In brief
Select exactly two scenarios from the scenario list and open the comparison view to see their projections, Monte Carlo outcomes, and parameter differences side by side.
Before you start
- You must have at least two scenarios saved. See Creating Scenarios if you have only one.
- The comparison view takes exactly two scenarios. To compare three or more, run separate comparisons.
- A meaningful comparison varies only one or two parameters at a time. Comparing scenarios that differ on many parameters makes it harder to attribute any difference in outcome to a specific cause.
Steps
- Navigate to Scenarios from the sidebar.
- Find the scenarios you want to compare and tick the selection checkbox on the first scenario card. A status bar appears at the bottom of the screen showing "1 scenario selected".
- Tick the selection checkbox on the second scenario card. The status bar updates to "2 scenarios selected" and the Compare button becomes active. Until exactly two scenarios are selected the button stays disabled.
- Select Compare in the status bar. The comparison view opens at
/compare. - Review the Overview section: a Summary Cards row with headline figures for each scenario, a Net Worth overlay chart plotting both projections on the same axes, and a Delta chart showing the year-by-year difference between them.
- Scroll to Income & Assets to see how each scenario's income sources and asset allocation compare over time.
- Scroll to Probability to see the Monte Carlo butterfly fan chart, which overlays both scenarios' percentile bands so differences in outcome range are visible.
- Scroll to Differences to see the parameter diff table — this lists every scenario assumption and highlights the values that differ between the two.
- To change which scenarios are compared, return to the scenario list and select Clear in the status bar to reset the selection, or select a different pair of scenarios.
What to check afterwards
- The comparison header shows the name of each scenario in two columns. Confirm these are the scenarios you intended to compare.
- The Net Worth overlay plots both scenarios as distinct lines. If the lines overlap completely, the scenarios may be identical or differ only on a non-material parameter — cross-check against the Differences table.
- The parameter diff table highlights every parameter that differs. If nothing is highlighted, the two scenarios are parameter-identical and any difference in outcomes is purely from Monte Carlo variability rather than a change in inputs.
- All figures in the comparison view are shown in real terms (today's purchasing power), consistent with the individual results pages.