4 items
Spot resale deals while you browse. Values listings you view against real eBay sold prices — privately, on your device. Arb Radar turns your normal marketplace browsing into deal-hunting. As you scroll Facebook Marketplace, Craigslist, OfferUp, or Mercari, Arb Radar quietly notes the listings you see and checks what those items actually sell for, using real eBay sold prices — not asking prices. Open the dashboard and every listing is ranked by profit spread and ROI. WHAT IT DOES • Captures listings you browse — no extra clicks, no separate searches • Values them against eBay sold comps, with accessory listings filtered out so a grill cover never prices a grill • Flags $1 "attention" listings and placeholder prices so they can't fake the top of your feed • Vehicles get real eBay Motors sold comps plus a one-click Kelley Blue Book link • Quick check: type any item name for its real resale value • Link import: paste any listing URL to pull it into your radar • Photo scan (optional): snap something in a store and identify + value it (uses your own Anthropic API key) • Your resale style: eBay fees (~13%) or local cash flips (0%) PRIVATE BY DESIGN Everything runs and stays on your device. There is no Arb Radar server, no account, no analytics. Nothing you browse is sent to us — we couldn't see it if we wanted to. Works with listings you actually view, at human browsing speed. Not affiliated with any marketplace.
Jul 7, 2026
rating_count is the Chrome Web Store ratings count, not a written-review count.
Media assets
Screenshots and videos on the listing.
Has promo video
Whether the listing includes at least one video.
Languages
Declared language locales.
Developer website
Listing exposes a developer website URL.
Contact email
Listing exposes a contact email.
Keyword in name
Case-insensitive substring match in the name.
Keyword in description
Case-insensitive substring match in the description.
Keyword occurrences in description
Count of case-insensitive occurrences in the description.
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
These are transparent listing completeness / keyword signals, not a prediction of Chrome Web Store search ranking.