I Built a Self-Hosted Competitor Price Monitor Because SaaS Pricing Is Out of Control

I Built a Self-Hosted Competitor Price Monitor Because SaaS Pricing Is Out of Control The Problem I run a small online store. To stay competitive, I needed to track my competitors' pricing. The obvious solution? Sign up for a SaaS price monitoring tool. Then I saw the prices: Prisync : $99/month Price2Spy : $20-58/month Keepa : $29/month (Amazon only) For a small operation, $99/month is absurd. So I built my own. What I Built: MarketEye MarketEye is a self-hosted competitor price monitor. You run it on your own machine, point it at any product URL, and it tracks price changes automatically. Tech stack: Python + FastAPI + SQLite + APScheduler Features: Drop any product URL → auto price tracking Email + webhook alerts on price changes Price history charts + CSV/JSON export Works with Amazon, Shopify, JD, Taobao, any HTML page Web dashboard included (no CLI needed) How It Works Add a product URL through the web dashboard MarketEye scrapes the page at configurable intervals When a price changes, you get an alert All data stays on your machine - no cloud, no third party The scraping engine handles various e-commerce platforms out of the box and provides a plugin interface for custom scrapers. Why Self-Hosted? One-time payment : $49 vs $99/month ($3,564 over 3 years) Unlimited products : no per-product fees Data privacy : your pricing data never leaves your machine Customizable : full Python source, extend it however you want What's Next I'll be sharing more technical deep-dives on the architecture, scraping challenges, and lessons learned from building and shipping this as a solo developer. Check it out: MarketEye on Gumroad Questions and feedback welcome! 🚀