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How I Built an Autonomous Website Audit & Discovery Tool with FastAPI, React 19 & Google Gemini

DEV Community: fastapi·PrajwalTheCoder·5 days ago
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Cold outreach in 2026 is broken. Business owners get flooded every day with generic template spam like "Hey, I noticed your website could use an upgrade..." —with zero proof and zero personalization.

I spent the last month building an open-source alternative: Leddro 🚀

Instead of spamming businesses, Leddro discovers authentic local businesses, runs deep server-side diagnostics (DNS, TLS/SSL, TTFB speed, mobile responsiveness), and drafts fact-checked proposals that cite authentic audit findings.

🛠️ The Architecture & Command Center

1. Deterministic Local Discovery (OpenStreetMap)

Rather than scraping bloated or stale lead databases, Leddro queries public geographic registries ( OpenStreetMap Overpass API ) by commercial category and locality. It pinpoints real, verified businesses that either have zero web footprint or have broken websites.

2.…

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