I Built 14 Free Tools for Developers AND People Who Hate Spreadsheets

Every day I generate UUIDs, encode Base64 strings, and convert timestamps. On weekends, I compare mortgage scenarios and plan retirement savings. I got tired of juggling five different websites — none of them doing everything I needed — so I built the toolbox I actually wanted to use every day. That's SD6 Tools . What's in the box 14 tools , split across four categories: Security & Generators Password Generator — Cryptographically secure, 8-128 chars, strength indicator UUID/GUID Generator — v4 UUIDs with bulk generation and multiple formats QR Code Generator — URLs, text, WiFi configs, with customizable output Finance Calculators Mortgage Calculator — Compare up to 4 scenarios side-by-side, full amortization schedules, 5 payment frequencies Retirement Calculator — Compound growth projections with inflation, employer matching, visual charts Auto Loan Calculator — Tax, insurance, and trade-in breakdown Compound Interest Calculator — See the power of compounding over time Savings Goal Ca