About ToolMarble

ToolMarble builds small, focused tools that load instantly and work without an account. Each tool explains how it works, and calculators show where their data comes from.

Our principles

• Private: tools run in your browser. What you type is not uploaded.
• Accurate: calculators use official sources, such as the U.S. Bureau of Labor Statistics for inflation.
• Fair: random tools use your browser's cryptographic random number generator, with equal odds for every outcome.