I had trouble finding a good FI planning and simulation tool that could model things in enough detail to finally ditch my spreadsheets... so I decided to build

I had trouble finding a good FI planning and simulation tool that could model things in enough detail to finally ditch my spreadsheets... so I decided to build one: ProjectiFi https://projectifi.io/ https://projectifi.io/ A while back I posted a very early version here (https://news.ycombinator.com/item?id=26969173 https://news.ycombinator.com/item?id=26969173), and just released a major overhaul with loads of new features and enhancements, many inspired by the initial HN commentary: - Monte Carlo mode with customizable simulations, variables, probability distributions - Backtesting on historical data - Multiple data persistence options for subscribers: cloud synchronization, localStorage only, or manual import/export - Stock/bond allocation curve over time - Improved support for international use cases (currency + locale selector, custom options and contribution limits for financial goals) - Ability to quickly switch between deterministic and probabilistic modes - Many new event types to model a broader range of scenarios - Better support for married filing jointly / couples planning (perhaps still not perfect, but definitely better) - Redesigned landing page, additional UI improvements - And more! If you feel like checking it out, I would love to hear what you think. Most of the functionality is free, but for anyone interested in upgrading to Premium, you can use coupon code "HN-15" for 15% off all plans :)