Spottable is a marketplace discovery and deal-checking app by Harbourside Apps, designed to help people find specific items on Facebook Marketplace without repeatedly refreshing or managing duplicate searches. Users describe what they want in plain English, including their budget and the towns they are willing to travel to. One watch can cover up to 25 areas, and Spottable searches public listings, filters out mismatches and time-wasters, and sends notifications when potential matches appear. The service supports categories such as cars, electronics, cameras, furniture, bikes, tools, and designer bags.

For promising listings, Spottable estimates a fair price using comparable items and highlights details about condition and potential risks, including concerns found in photos or descriptions. It can also help users prepare questions or messages for sellers. The iPhone app creates watches and sends alerts, while the Chrome extension analyzes listings opened on desktop; either can be used independently. Spottable says it does not require a Facebook password or connect to a user’s Facebook account.