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

Leena Jadhav — Sat, 15 Aug 2026 14:27:24 +0000

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.

DEV Community: Leena Jadhav

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