Build your financial plan, test decisions and compare outcomes

Hey, I decided to build FinSim (https://financial-simulator-wine.vercel.app) because I kept noticing how people make big financial decisions with incomplete context. A raise, moving out, buying a house, paying debt faster, saving more, or switching jobs can all change your financial future a lot, but most people are left doing rough mental math, messy spreadsheets, or asking for advice from people who do not actually know their full situation. So I wanted to build something simpler where you enter your current financial picture once, income, savings, debt, expenses, and goals, which becomes your base plan. And from there, you can explore different decision scenarios, like:

- saving an extra $250/month

- taking a higher-paying job

- moving to a more expensive place - buying a house

- paying debt faster

- keeping things exactly as they are

FinSim then compares each scenario against your base plan and shows the impact on net worth, savings, debt payoff, and timeline to goals, with expected, downside, and upside outcomes. The main thing I wanted to avoid was fake precision. The future is not one exact line, so the product is designed to show range, tradeoffs, and what is driving the result. Still early, so I’d genuinely love feedback: What would make something like this useful enough for you to actually use?