Overview
MarketPilot is a Firefox extension I built to help scan Facebook Marketplace more efficiently by turning saved searches into a structured shortlist of listings that are actually worth reviewing.
The core problem was noise. Marketplace search results are full of near-matches, bad pricing, weak descriptions, and listings that take too long to evaluate manually when you are trying to move quickly. I wanted a tool that reduced that friction without removing the human decision-making part of sourcing.
Two Working Modes
MarketPilot supports two different operating styles depending on how aggressive or selective you want to be.
Finding Mode is built for broader discovery, niche hunting, and catching near-miss listings that might still be worth checking manually.
Scalping Mode is stricter. It is for situations where you only want listings with cleaner margin, better negotiation setups, or stronger flip potential.
That split makes the tool useful both when you are exploring and when you are trying to move with discipline.
What It Does
The extension can:
- Scan the Facebook Marketplace searches you define
- Apply price, confidence, keyword, and negotiation filters
- Reopen promising listings and verify the full listing details
- Estimate value and separate direct buys from negotiation plays
- Let you manually mark listings as yes, maybe, or no
- Optionally use your own OpenAI API key for AI-assisted review
The goal is not just to rank listings, but to help you work through them faster and with more consistency.
Product Design
One of the decisions I liked most in MarketPilot was keeping AI optional. The extension works from your own browser session and your own Marketplace searches, and AI-assisted review is only used if you explicitly enable it and provide your own API key.
That matters because it keeps the extension useful even without AI, while still giving advanced users a way to layer in faster screening when they want it.
Why It Matters
MarketPilot is a good example of the kind of software I like building: focused, practical, and directly useful to a real workflow. Instead of trying to be a generic automation tool, it solves a narrow but high-friction problem for people who actively source deals and need to move fast without drowning in junk listings.
