Hi Product Hunt, I'm Ammar, CTO at Inovativex.

I built InovoTools because most free calculator sites give you a number and nothing else. When the result matters, like a loan payment, a tax figure or the markup on a quote, you want to see how it was worked out.

So every tool shows:

the formula it uses
a worked example you can check by hand
its limits, plus the tax year or official source where rules change

Everything runs in your browser with no account, and text, PDF and image tools process your files locally.

There are 650+ tools so far: loan, mortgage and ROI calculators, unit converters, country tax and VAT calculators, JSON and text tools, and PDF tools like merge, split and compress. Recent additions include a solar payback calculator and a real estate ROI calculator for rental property.

You can also embed any calculator on your own site for free.

Which calculator do you wish existed? And if a result ever looks wrong, tell me. I read every comment.