usepreciso

usepreciso offers a collection of over 60+ free tools distributed across 7 different sites. Every tool runs entirely client-side, ensuring data stays on the user's machine. The platform requires no registration and remains ad-free while providing various utilities for quick tasks. Everything runs in your browser. Nothing is transmitted, nothing is logged, nothing is stored. No account, no ads, no data collection Here's what's live: 🔧 devtools.usepreciso.com - JSON formatter/validator/diff/converter, JWT decoder, regex tester, UUID generator, hash generator (MD5→SHA-512), Base64, cron builder 🕐 datetime.usepreciso.com - Timezone converter, world clock, Unix timestamp, age calculator, meeting planner, DST tracker (68 countries + full historical data for 72 that stopped) 📝 text.usepreciso.com - Word counter with readability score, case converter, markdown preview, text diff, lorem ipsum, find & replace 🎨 studio.usepreciso.com - Chart generator (CSV/Excel/JSON → any chart type), QR codes, color converter with WCAG contrast checker, CSS gradients, box shadows, SVG wave maker 📐 units.usepreciso.com - 120+ unit conversions across 12 categories ⚡ productivity.usepreciso.com - Pomodoro timer with Screen Wake Lock so your screen stays on 🧒 kids.usepreciso.com - Fullscreen toddler activities (keyboard smash, bubble pop, drawing, animal sounds, ABC/123, piano). Locks to fullscreen so nothing closes by accident. My daughter is 2, the 2-second hold to exit wasn't a UX decision, it was survival. In 2026, everything you paste into a random browser tool is potential training data for someone. I wanted a set of tools where that question simply doesn't arise.