Slingshot is a personal finance platform for modeling retirement and other financial questions. It projects portfolio value, spending, and net worth over time using fixed or variable strategies and inputs. Slingshot provides your retirement income taxable source over time and Monte Carlo simulations, going beyond other free tools. Your personal financial data never leaves your device.

The model is completely transparent, with every technical assumption and calculation rationale clearly outlined, so you can trust the numbers. You can explore the interactive charts or download the raw CSV to verify the data yourself!