Build or Skip is a product opportunity research tool that helps independent developers and startup teams identify products that are already generating revenue before committing to a new build. The platform aggregates publicly available payment signals, tipping data, site intelligence, and backlink resources to show which products demonstrate commercial activity, which are growing, and which may warrant further investigation. It ranks payment signals on a month by month basis to reveal what is growing, lasting, and worth closer examination. The tool offers several ranking systems, including revenue rankings with over 50,000 entries, tip rankings with more than 800 entries, and backlink rankings with over 500 entries. Users can filter products by area, payment channel, domain rating, registration date, and payment signals, then compare six month momentum across candidates. Additional features include new domain detection, site profile comparisons, public Buy Me a Coffee tip amounts, active month tracking, amount trends, and a collection of AI product directories and resource sites with submission details. The platform also provides an API for querying domain rating, domain registration, monthly traffic, and structured homepage data, and supports integration with AI clients for discovering published datasets and reading site snapshots. A typical workflow involves using revenue and tip rankings to surface products with commercial signals, then comparing their momentum, consistency, and site characteristics before deciding whether to build, watch, or skip. Users can review collected comment articles by domain and review date, open original pages for evaluation, and examine privacy redacted user feedback screenshots translated into English. Revenue rankings follow calendar month reporting, while comment and AI tool backlink resources update daily, with other site data showing its relevant date on the page. The platform emphasizes that these are research signals rather than verified orders or revenue figures.