How I Built a Multilingual Financial Calculator That's Discoverable by AI and Search Engines

Most financial tools online are English-only, locked behind paywalls, or buried in SEO-unfriendly single-page apps. I built SmartMoney77 to fix that — a free, open-source collection of 32+ financial calculators in 6 languages with 22 currencies. Here's what I learned about making a web app discoverable by both Google and AI assistants like ChatGPT, Gemini, and Perplexity. 1. Structured Data Is Your Best Friend Every calculator page includes JSON-LD schema markup (WebApplication, FAQPage, BreadcrumbList). This tells search engines and AI crawlers exactly what each page does — without guessing from the HTML. 2. One URL Per Language, Not Query Params Instead of ?lang=he, each language gets its own path prefix (/en/, /he/, /ar/, /es/, /pt/, /in/). This means each version is independently indexable and linkable. Google treats them as separate pages, and AI tools can reference the right language version. 3. Server-Side Rendering for Calculator Results SPAs are invisible to most AI crawlers.