Free Online Tools & Calculators
Built & Deployed by Karan KK
Real tools. Real deployments. Every project below is live, free to use, and deployed across multiple high-authority platforms — Cloudflare, Firebase, GitHub Pages, Vercel & Netlify. Built from scratch. No templates. Just code.
About The Developer
I'm Karan Rajput KK — blogger, SEO expert, affiliate marketer, and self-taught developer. While most know me from KaranKK.com for blogging and SEO content, I have been quietly building free online tools since 2021 that solve real everyday problems.
Each tool is built from scratch using HTML, CSS, and JavaScript — no heavy frameworks, no paid APIs, no bloat. Fast, clean, and mobile-friendly. Every project is deployed on multiple high-authority platforms to maximize reach and reliability.
These tools also serve as a reference for my work — each deployment on GitHub, Firebase, Cloudflare, Vercel, and Netlify acts as a live proof of what I build.
All Tools & Calculators
Every tool below is live, free, and deployed on 5 platforms simultaneously. Click the main button to visit the primary domain — or explore all deployments below each card.
Send a WhatsApp message to any number without saving it in your contacts. Enter the number, type your message, and click — opens WhatsApp directly. Fast, private, and works on all devices.
🚀 Visit directwapp.com — Advanced Tool → Also Available OnFind out exactly when your half birthday falls — exactly 6 months from your birthday. A fun, shareable tool that works for any date. Get your half birthday date in seconds.
🚀 Visit halfbirthdaycalculator.us — Advanced Tool → Also Available OnCalculate Cost Per Mille (CPM) for your advertising campaigns instantly. Enter impressions and cost to get your CPM rate, or reverse-calculate any missing variable. Essential for bloggers and advertisers.
🚀 Visit cpmcalculator.info — Advanced Tool → Also Available OnCalculate your Coast FIRE number — the savings amount needed today so your investments grow to your retirement goal without any additional contributions. Plan your financial freedom with precision.
🚀 Visit coastfirecalculator.us — Advanced Tool → Also Available OnCalculate the perfect tip amount for any restaurant bill. Split the bill among multiple people, choose your tip percentage, and get the exact amount each person pays. Simple, fast, and works offline.
🚀 Visit tipcalculator.website — Advanced Tool → Also Available OnCalculate Roblox DevEx earnings — convert your Robux to real USD instantly. Enter your Robux amount and see exactly how much you'd earn through the Developer Exchange program. Perfect for Roblox developers.
🚀 Visit devexcalculator.us — Advanced Tool → Also Available OnCalculate how much rent you can afford based on your income, or split rent fairly among roommates. Includes affordability guidelines and monthly budget breakdown to help you make smarter housing decisions.
🚀 Visit rentcalculator.us — Advanced Tool → Also Available OnAI-powered love compatibility calculator tailored for Indian users. Enter two names and get a fun, AI-generated compatibility score with personalized insights. Built for entertainment and virality.
🚀 Visit lovecalculatorai.in — Advanced Tool → Also Available OnThe global version of the AI love calculator — designed for international audiences. Same AI-powered compatibility engine with a universal UI, supporting users from every country and language preference.
🚀 Visit lovecalculatorai.one — Advanced Tool → Also Available OnCalculate your exact age in years, months, days, hours, and minutes from your date of birth. Also shows your next birthday countdown, day of birth, and fun age facts. The most detailed DOB calculator online.
🚀 Visit dobcalculator.us — Advanced Tool → Also Available OnUnit Crafter —
Free Unit Converter Tool
Convert between hundreds of units across length, weight, temperature, speed, area, volume, data, and more — all in one clean, fast interface. Built for students, engineers, developers, and everyday users who need accurate conversions instantly. No ads. No signup. 100% free.
🔧 Visit unitcrafter.us — Explore The Tool →