Curb Check — Marketplace Assist

Scores used-car listings on Facebook Marketplace for reliability and known problems. Works entirely in your browser.

Buying a used car on Facebook Marketplace is hard for one reason: you can't tell a good listing from a bad one until you've already wasted an hour. Curb Check fixes that. As you scroll Marketplace, it color-codes every vehicle listing — and when you open one, it tells you what a knowledgeable buyer would notice: which engine to avoid, what breaks on that year, and exactly what to ask the seller. Every car you look at is saved to a private dashboard, so you can compare, filter, and track the ones worth pursuing instead of losing them in an endless scroll. What it does Knows which model years to avoid. A 2013 Kia Sorento has a documented engine defect. A 2005 Honda Pilot can destroy its own transmission. A 2010 Subaru Forester will likely need head gaskets. Curb Check covers 46 popular cars, SUVs, and minivans with researched, year-specific problem data — not generic advice. Sets mileage limits per model, not one blunt number. A Toyota Avalon at 180,000 miles is fine. A turbo hot-hatch at 180,000 miles is not. Curb Check uses each model's real durability to decide what's too many miles — and you choose how conservative to be. Tells you exactly what to ask. Every listing gets diagnostic questions specific to that model and year. Not "is it still available" — questions like "Has the KSDS software update been installed?" (which determines whether a Hyundai's engine warranty is still valid) or "Which engine — the 4-cylinder or the V6?" Flags the listings worth skipping. Stale listings, prices that don't add up, sellers with brand-new accounts, mileage that's implausible for the year. Writes the first message for you. One click copies a clean opener with the right questions already in it. A dashboard that remembers. Every car you scroll is saved to a private dashboard in your browser — filter, sort, mark the ones you're pursuing, and add your own notes. What it doesn't do Curb Check is built for people buying reliable, everyday used cars — sedans, SUVs, and minivans in normal price ranges. It's not a tool for exotics, heavy trucks, or project cars. It won't tell you what a car is worth; it tells you what's likely to break. Privacy Curb Check has no servers. It collects nothing, transmits nothing, and tracks nothing. Everything runs in your browser, and your data never leaves your device. Pricing $29 one-time, with a 7-day free trial. No subscription.