Hey Product Hunt community! 👋 I built Decidely because I was tired of modern financial websites doing three things: 1. Slapping a paywall or email capture on basic math formulas. 2. Cluttering the screen with aggressive popups, credit card lead-gen forms, and trackers. 3. Using unpredictable AI that "hallucinates" when calculating amortization and compound interest. Decidely was built on a different philosophy: • 100% Deterministic: Pure mathematical formulas (Bengen 4% rule, 28/36 DTI mortgage framework, 20/4/10 car rule). • Privacy-First: All calculations run 100% client-side in your browser. Zero financial data is ever collected or sent to a server. • Zero Login Gates: No signups, no credit cards, no premium tiers. We currently have 20+ calculators covering Money & Debt, Real Estate, Automotive, Investing, and Health, plus an offline Android app. I'd love to hear your feedback on which calculators or scenario comparison tools we should build next! What financial decision do you find hardest to model?

Decidely

100% free financial calculators & decision tools

100% free financial calculators & decision tools