I built a free financial + marketing calculator hub (no signup) — here's why

I kept bouncing between different sites for financial and marketing calculations — one for ROI, another for SIP, another for tax estimates. So I built FinCalcHub Marketing (fincalchub.xyz) to combine them into one place.

It covers ROI/ROAS for marketers, SIP/compound interest/retirement planning for investors, income tax and profit margin calculators for business owners, plus a live crypto/currency converter and an A/B test significance calculator.

Everything runs entirely in the browser — no signup, no data collection. Still early days (launched a couple months ago), would love feedback from this community on what to add next.