Tools
Investing tools for long-term clarity.
Interactive calculators and simulations designed to help long-term investors understand compounding, portfolio allocation, inflation, retirement planning, and Bitcoin.
Available today
What you can use right now
One focused, fully built tool to start with. Open it and explore how long-term wealth takes shape.
Compound Interest Calculator
Understand how time, contributions, returns, and inflation shape long-term wealth.
Portfolio Allocation Calculator
Split your money across assets and see your weighted return, concentration, and long-term growth after inflation.
Coming soon
The growing toolset
The roadmap is organized into categories so the catalog scales naturally. New tools appear in their category as they are built.
Core Calculators
Foundational tools for compounding, contributions, and inflation.
Dollar Cost Averaging Calculator
See how investing a fixed amount on a schedule behaves across different market paths.
Inflation Calculator
Translate future money into today's purchasing power and see what inflation quietly costs.
Dividend Income Calculator
Project how reinvested dividends can compound into a growing income stream.
Net Worth Projection
Model how savings, investments, and contributions grow your net worth over time.
Portfolio Tools
Build, compare, and stress-test asset allocations.
On the roadmap
Portfolio Tools tools are planned and will appear here as they are built.
Retirement
Plan for financial independence and life after work.
FIRE Calculator
Estimate how much you need and when financial independence becomes possible.
Retirement Planner
Plan contributions, growth, and safe withdrawals across your retirement horizon.
Bitcoin
Understand how a Bitcoin allocation changes a portfolio.
Bitcoin Allocation Simulator
Visualize how a 1%, 5%, 10%, or 20% Bitcoin allocation changes portfolio behavior.
Research
Compare funds and instruments side by side.
ETF Comparison
Compare expense ratios, yields, historical returns, and risk side by side.
Education
Interactive lessons that explain the ideas behind the tools.
On the roadmap
Education tools are planned and will appear here as they are built.
Where Rionux is going
A full platform for long-term investors
Rionux is being built step by step, with quality over quantity. Each area below expands the platform from a set of calculators into a complete investing companion.
Portfolio planning
Design, compare, and rebalance allocations built around your long-term goals.
Investment research
Clear, educational breakdowns of ETFs, indexes, and Bitcoin in one place.
Interactive education
Concepts taught beside the tools, so every result comes with understanding.
Scenario simulations
Test how inflation, returns, and timing reshape outcomes before you decide.
AI-powered explanations
Plain-language answers that explain why your numbers move the way they do.
Where to start
A suggested learning path
New to long-term investing? Follow this order. Each step builds on the last, from the foundations of compounding to building a complete portfolio.
- Open
Compound Interest
LiveStart here. Learn why time and reinvested growth do most of the work.
Dollar Cost Averaging
PlannedUnderstand how steady, scheduled investing behaves through market ups and downs.
- Open
Portfolio Allocation
LiveCombine assets and see how diversification shapes risk and return.
FIRE Planning
PlannedTranslate your savings rate into a realistic path to financial independence.
ETF Research
PlannedCompare funds on cost, yield, and history before you allocate.
Bitcoin Allocation
PlannedExplore how a small Bitcoin position can change a long-term portfolio.
Our philosophy
Quality over quantity
“We build fewer tools, but we build them exceptionally well.”
Rionux grows step by step. Every tool is designed to create understanding, not just output numbers — so quality always comes before quantity.