1. Input wizard: current age, planned retirement age, current savings, monthly contribution, and expected annual return. 2. Projection chart showing portfolio growth to and through retirement, with inflation adjustment. 3. Income target field that converts to a required nest egg using a withdrawal rate the user can change. 4. Readiness score comparing projected savings against the target, with a clear gap or surplus number. 5. Scenario buttons: retire 5 years early, contribute 500 more per month, 1 percent lower returns, and a custom what-if form. 6. AI explainer that turns the projection into three plain-English sentences about what to change. 7. Account buckets for 401k, IRA, and taxable savings so users can see each stream. 8. Social security placeholder the user can toggle on with a monthly estimate. 9. Monte Carlo-lite view: optimistic, expected, and pessimistic paths on the same chart. 10. Save and share a read-only link to the plan.