Original Posts

Hey IH! 👋

I just launched SuperCalc—a collection of 273+ financial calculators that are

actually free to use.

The Problem:

Every time I needed a calculator (retirement planning, mortgage comparison, tax

estimation), I'd hit the same wall:

- Sites drowning in ads

- "Sign up to see results"

- Broken on mobile

- Missing the exact calculator I needed

What I Built:

Started with 15 calculators I personally needed. Now at 273+ covering:

• Finance (compound interest, retirement, net worth)

• Tax (income tax, capital gains, sales tax)

• Real Estate (mortgage, rent vs buy, cap rate)

• Business (valuation, break-even, cash flow)

• Health (BMI, TDEE, pregnancy)

Tech stack: Next.js, TypeScript, static export (blazing fast)

What Makes It Different:

- Zero ads, zero tracking, zero signup

- Mobile-first design

- Each calculator has formulas + explanations

- 100% free forever (not freemium)

My Question for IH:

How do you monetize genuinely helpful tools without ruining the UX? I'm

bootstrapping this and want to keep it free, but also exploring:

- Affiliate links (tasteful)

- Optional "buy me a coffee"

- Premium API for developers

What's worked for you?

👉 https://supercalc.dev/

Would love your feedback! Which calculators would you add?