The search for beautifully designed and functionally robust financial software often leads to compromise, but a new application created specifically for the Financial Independence, Retire Early (FIRE) community aims to bridge that gap. Developed by Kyle, a Boston-based software engineer who achieved financial independence by his thirties, ProjectionLab offers a sophisticated, highly visual approach to long-term financial planning and forecasting.
The application was recently highlighted by prominent personal finance figures as one of the most comprehensive planning tools available for those pursuing early retirement. Built over thousands of hours of coding during nights and weekends, the software addresses a specific void in the market: the need for a modern, fluid, and nuanced way to map out complex life plans without sacrificing data privacy or relying on standard, rigid online retirement calculators.
Kyle’s journey into the FIRE movement began after graduating from college in 2015. Like many young professionals entering the workforce, he initially gave little thought to his long-term financial trajectory, focusing instead on standard rules of thumb like saving a portion for retirement and keeping rent reasonable. However, a growing sense of dissatisfaction with the traditional American career path—sacrificing decades to meetings, briefings, and corporate bureaucracy—prompted him to look deeper.
Discovering seminal thought leaders and resources in the FIRE community, including Pete Adeney, J.L. Collins, Vicki Robin, and foundational literature such as The Simple Path to Wealth and The Psychology of Money, completely shifted his perspective. He realized that active control over his financial future could eventually yield the freedom to live life on his own terms rather than waiting until traditional retirement age.
As he dove deeper into the various sub-movements of financial independence, ranging from leanFIRE and fatFIRE to coastFI and Barista FIRE, Kyle noticed a distinct lack of tools that allowed individuals to truly visualize these abstract theories. Theoretical guidelines were plentiful, but hands-on forecasting applications that could map out diverse life options and model complex trade-offs were harder to find. Unable to locate a platform that met his standards for both aesthetic design and analytical depth, he decided to build one himself.
Developing a Modern Financial Planner
What started as a creative outlet during off-hours eventually evolved into ProjectionLab. Designed as an alternative to traditional retirement calculators, the software allows users to build detailed financial models of their entire lives, run Monte Carlo simulations, backtest strategies using historical data, and review estimated tax analytics across various income types.
Importantly, the platform was built with strict privacy standards in mind. The application features a free sandbox mode that does not require users to link their actual financial accounts or even create an account to test its functionality. It operates locally and independently, avoiding the data-sharing practices and advisory upsells common in commercial financial software.
The core of ProjectionLab revolves around a flexible milestone system. Rather than relying solely on a fixed retirement age, users can define specific life events and milestones—such as reaching a targeted net worth, purchasing a home, starting a family, changing careers, or relocating internationally—and use them as structural anchors for the rest of their financial plan. Income streams, expenses, and asset allocations can all be bound to these milestones, ensuring that adjustments to major life goals automatically propagate through the entire projection.
Modeling Real-Life Scenarios
To demonstrate the application’s capabilities, financial planners can simulate realistic scenarios, such as an early-career married couple navigating student loans, renting, and future family planning while discovering the concepts of financial independence.
In a baseline scenario, users can input career progression, employer-sponsored retirement contributions, periodic major expenses like vehicle purchases, and escalating healthcare costs later in life. By defining financial independence as achieving a net worth equal to 25 times annual expenses, the software projects cash flows through detailed Sankey diagrams, illustrating how earned income, employer matches, and taxes interact with debt service and investments.
The platform also incorporates robust tax analytics, allowing users to evaluate future income streams against estimated tax brackets and observe how marginal and effective tax rates shift over time. Furthermore, users can move beyond deterministic planning—which assumes a constant rate of return—to run Monte Carlo simulations based on historical market data, such as S&P 500 returns, dividends, and U.S. inflation rates, providing a comprehensive spectrum of possible financial outcomes.
Beyond baseline projections, the software enables users to test alternative "dream plans." For example, individuals can model the financial impact of transitioning from renting to homeownership, reducing full-time employment to part-time work at an earlier age, or launching a secondary revenue stream from a passion project or side business. These variables allow users to visualize how adjusting lifestyle inflation, career paths, and secondary income sources directly influences their overall chance of long-term success.
ProjectionLab is currently available for public use, offering a free sandbox version for basic simulations alongside a premium version equipped with advanced modeling features for international scenarios, granular account settings, and detailed drawdown sequences.
