Launched this week

Rionux
Free investing calculators that explain the why
17 followers
Free investing calculators that explain the why
17 followers
Rionux is a growing set of free investing calculators built around one idea: don't just give you a number, help you understand it. Each tool shows the reasoning behind the result with clear charts and plain-language insights, in today's money and based on your own assumptions. Made for long-term investors, no signup, no advice — just clarity.





The inflation-adjusted charts make a big difference for someone like me who keeps second-guessing whether my retirement number even makes sense anymore. Appreciated that nothing asked for my email first.
The plain-language breakdowns next to each chart are genuinely well done - feels like having a patient friend walk you through the math instead of just spitting a number back at you.