About ToolJutsu
I'm Balaji Surendran, a website designer and digital marketing analyst from India. ToolJutsu is my project — a single home for 500 online tools I've built and tested to be fast, private, and useful.
Why I built this
There are plenty of online calculator and utility sites, and most of them work fine. What bothered me as a user was the variety of small frictions — different sites for different tools, mandatory signups for basic features, and the uncertainty about whether my input was being processed on someone's server or just in my browser. I wanted one place where the answers were predictable: it works in the browser, it doesn't ask for anything, and there's only one site to remember.
I'm in digital marketing, so I understand why most sites are built the way they are. They monetise scale. But I'm also a user, and as a user, I wanted somewhere I could go that just worked: open the page, use the tool, close the tab. No signup, no upload, no surprise.
So I built it.
What's different here
Every calculation runs on your device. Once the page has loaded, the math happens in your browser using JavaScript — your input never gets sent to a server, no third-party service ever receives the values you enter into a tool, and no analytics on what you type. You can verify this yourself: load a tool, disconnect your internet, and watch it keep working. The one exception is the contact form, which sends your message to a form-delivery service (Web3Forms) — disclosed in the privacy policy.
The math is taken from published, citable sources — Mifflin-St Jeor for BMR, the ADA ADAG study for A1C conversion, Sakrete and Quikrete spec sheets for concrete bag yields, and so on. Each tool that uses a non-trivial formula tells you which one. Each tool that touches a regulated topic — health, finance, tax — carries a plain-language disclaimer about its scope.
I'm not a doctor, lawyer, or financial advisor, and the site never pretends otherwise. The tools are built for everyday math, not professional decisions. When a calculator's answer might affect a clinical or legal outcome, the page tells you which authoritative source to consult instead.
How ToolJutsu is funded
Eventually the site will display ads via Google AdSense. That is the only revenue source planned.
The site does not, and will not:
- Sell your data
- Track you across other sites
- Require an account
- Lock features behind a paywall
- Embed affiliate links inside tool pages
If that ever changes, this page will say so before it does.
Get in touch
Email: [email protected]
— Balaji Surendran
Thanjavur, Tamil Nadu, India
Last updated: 22 May 2026