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Scenario comparison

Compare the decisions, not just the calculators

Save a baseline and one or more alternatives from the calculators, then compare the headline outputs, input assumptions and change versus baseline inside My Scenarios.

Baseline deltasBefore versus after
Input auditSee what changed
JSON exportPortable backups
Local firstNo account required
How it works

The comparison workflow

1. Save the baseline

Open the relevant calculator, enter the current position, then save it with a clear name such as "Current salary" or "Current mortgage".

2. Save the alternative

Change one thing at a time: pension contribution, pay rise, mortgage rate, childcare cost, ISA wrapper or ETF allocation.

3. Compare in My Scenarios

Select two or more saved scenarios. The first selected item becomes the baseline, and the comparison table shows deltas where values are comparable.

Open My ScenariosUse annual reviewChoose a route first
Best use cases

Where comparison adds real value

DecisionBaselineAlternativeWhat to watch
Pay riseCurrent salaryNew salary, bonus or sacrifice routeExtra take-home can be much smaller than the gross increase.
Child Benefit or childcareCurrent adjusted net incomePension or Gift Aid scenarioOne household change can move several benefit thresholds.
MortgageCurrent rate and termNew rate, overpayment or remortgage optionMonthly saving is not the same as total cost saving.
InvestingUnwrapped or current allocationISA/GIA/pension or ETF mixTax wrapper, OCF, overlap and concentration all matter.
Data promise

Private by default

Saved scenarios are stored in your browser unless you export them or enable any future sync option. This keeps the tool useful without forcing accounts, subscriptions or locked dashboards.