I built 49 free online tools in 3 months — here's what I learned

I have a confession. Every time I needed to calculate my EMI, check my BMI, or figure out how many college classes I could skip — I'd Google it, land on some site plastered with ads, get asked to sign up, and then give up halfway. So I did what any frustrated developer does. I built my own. How It Started It started with one EMI calculator. Just a simple HTML page I made for myself to calculate home loan EMIs without the nonsense. Then my friend asked if I could add an SIP calculator. Then another asked for a CGPA converter. Then my cousin wanted an attendance tracker for college. Three months later — I had 49 tools across 5 categories. What I Built WebToolsKit is a collection of 49 free online tools across 5 categories: 💰 Finance EMI Calculator (home, car, personal loans) SIP Returns Calculator Salary Hike Calculator Rent vs Buy Calculator Fuel Cost Calculator Wedding Budget Calculator Subscription Trap Calculator and more... 🌿 Health BMI Calculator TDEE Calculator Sleep Cycle Calculator Water Intake Calculator Calorie Burn Calculator and more... 💼 Freelance Freelance Rate Calculator Invoice Generator Project Profit Calculator WFH Cost Calculator Notice Period Calculator and more... 🎓 Students CGPA Calculator Attendance Calculator (aka the "class bunk calculator" 😄) Study Planner Marks Needed Calculator and more... ⚡ Utility QR Code Generator Word & Character Counter Pomodoro Timer Password Strength Checker Hashtag Generator and more... The Rules I Set For Myself From day one I had three non-negotiable rules: No signup — ever. If a calculator needs you to create an account, it has failed at its only job. No ads — ever. Ads on a calculator page are a crime against usability. Works on mobile — always. Half the people who need a quick calculation are on their phone. These three rules shaped every decision I made. What I Used to Build It The tech stack is embarrassingly simple: Pure HTML, CSS, JavaScript — no frameworks, no build tools GitHub Pages — free hosting, zero config Google Fonts — for typography That's it. No React. No Vue. No npm. No webpack. Just files. This kept the site incredibly fast and the codebase easy to maintain. Every tool is a single self-contained HTML file. What I Learned Constraints are a feature, not a bug Deciding "no frameworks" forced me to write cleaner, leaner JavaScript. Every tool loads in under a second. SEO matters from day one I ignored meta tags for the first few weeks. Big mistake. The moment I added proper title tags and meta descriptions for all 49 pages, Google started picking up the site within days. The "class bunk calculator" is my most viral tool I built it seriously — as an attendance tracker for Indian college students. But the moment I described it as "find out how many classes you can skip" — it resonated. Sometimes framing is everything. Simple tools have real value I almost didn't build the tip calculator because "it's too simple." But people search for it every day. Don't underestimate simple. Open source builds trust Adding an MIT license to the GitHub repo changed how people perceived the project. Transparency matters. The Numbers So Far The site is only 5 days old at the time of writing, but Google Search Console already shows: 29 impressions in the first 5 days 6 countries — India, USA, Bangladesh, Mexico, Indonesia, Malaysia Top keyword: "student attendance calculator" Average position: 56.7 (and climbing) Early days — but the trajectory is promising. What's Next More tools based on community feedback Better mobile experience A shareable results feature (so you can share your EMI calculation with a link) Try It 👉 https://webtoolskit.github.io It's free. No signup. No ads. Open source on GitHub. If you find a bug, want a tool added, or just want to say hi — drop a comment. I read every one. 🙏 Built with HTML, CSS, JS and a lot of frustration with ad-filled calculator sites.