About Esytol

Useful tools shouldn’t require a spreadsheet, a login, or an ad-block. Our mission is to build the tools people actually need — instantly, for free, and without collecting your data — starting where the need is greatest and the stakes are highest: money decisions in India.

We would rather be the best in the world at one category than mediocre across ten, so we go deep before we go wide. Finance came first because the decisions are consequential and the existing tools are poor. It will not be the last.

Most online calculators are slow, cluttered with ads and pop-ups, gate results behind sign-ups, or quietly send your numbers to a server. We wanted the opposite: a clean tool that loads instantly, shows its working, and never asks who you are.

Every calculator is built on a pure, well-tested calculation engine that is separated from the interface. Each engine is validated against thousands of randomised scenarios and cross-checked against independent implementations, so the numbers you see are the numbers you’d get by hand.

We verify every formula against authoritative sources — the RBI, AMFI, SEBI, NHB, and major Indian bank documentation — and preserve exact accounting identities (for example, principal + interest = total payment) down to the last paisa. Where a real-world figure can differ (lender rounding, fees, taxes), we say so in a disclaimer on each tool.

Every calculation runs entirely in your browser. We don’t collect, store, or transmit your inputs, and no account is ever required. Read the full Privacy Policy.

You shouldn’t have to take our arithmetic on trust. Every calculator publishes the formula it uses, the official sources behind it — RBI, the Income Tax Department, EPFO, PFRDA and others — the assumptions it makes, and its limitations. If a number looks wrong, the methodology on the page tells you exactly how it was produced.

Our Learn articles go further, explaining the rules themselves and citing the regulator rather than asking you to believe us.

Built with Next.js and React, written in TypeScript (strict mode), styled with Tailwind CSS, charted with Recharts, and tested with Vitest. The site is statically generated and served from a CDN, which is why it loads instantly.

We’re actively expanding — in depth and in breadth. On the way:

• Deeper finance coverage — goal planners, capital gains, and advance tax
• New categories beyond finance and everyday
• Comparison modes (e.g. SIP vs lumpsum, home vs personal loan)
• Prepayment and step-up scenarios for loans and SIPs
• Downloadable PDF summaries

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