Case study · Fintech · fincalix.com

FinCalix — every rupee, calculated.

A financial decision platform for real people: EMI, SIP, tax, retirement and 30+ other calculators — free, fast, and honest, with no paywall between a user and their own numbers.

• 30+calculators
• 100%free, no paywall
• 2surfaces: web + Android

The problem

Financial calculators in India are mostly lead-capture traps: partial answers, forced sign-ups, and results skewed toward whatever product the site sells. People making real decisions — a loan, a SIP, a retirement plan — needed a place where the mathematics is the product.

Challenges

• Trust without a brand. A new financial site earns credibility through precision, speed and restraint — there is no marketing shortcut.
• Breadth without bloat. 30+ calculators must feel like one coherent product, not a link farm; each needed consistent inputs, explanations and shareable results.
• Mobile-first reality. Most financial decisions in this market happen on a phone, so the web experience and an Android app had to share logic exactly — a rounding difference between surfaces destroys trust instantly.

Architecture & stack

FinCalix runs on Mokshify's standard production platform: a React front end, calculation logic packaged as a single shared library consumed by both the web app and the Android app (so results agree to the last paisa), service APIs on Node.js, PostgreSQL and Redis at the data layer, and a GitHub Actions pipeline where every release passes tests and an AI review before staged rollout. Static delivery and cache-first design keep calculator pages fast on low-end devices and slow networks — the audience this product exists for.

Results

• 30+ calculators live, spanning loans, savings, tax and retirement.
• Free end to end — the no-paywall promise is a product feature, stated on the homepage and kept.
• One codebase of financial logic serving web and the Play Store Android app.

Lessons learned

Precision is a design language. The most effective trust signal wasn't a badge or a testimonial — it was showing the formula, the assumptions and the same answer on every surface. That principle now shapes how we build every consumer-facing platform.

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