Everyday decision tools

Fast calculators for everyday decisions

Clear results, transparent assumptions, and useful next steps—without the clutter.

Popular tools

Start with the tools people use most.

Small, focused utilities for common questions.

Clear calculators for savings, borrowing, income, and everyday money decisions.

Practical health reference tools with transparent assumptions and calm guidance.

Simple tools for dates, durations, and planning your time.

Fast browser-based utilities for common developer tasks.

Small text utilities for writing, editing, and organizing content.

Straightforward explanations to help you use each tool well.

A practical guide to contributions, rates, and time.

What this screening measure can and cannot tell you.

A quick workflow for valid and readable JSON.