Candidate sourcing tools help recruiters find people who aren't applying — the passive talent that makes up most of the market. The category spans four models, and knowing which model you're buying matters more than any feature list:
1. Search databases (hireEZ, SeekOut, AmazingHiring) aggregate public profiles into a searchable index with contact data. You bring the search skill; they bring the haystack.
2. Engagement platforms (Gem, SourceWhale) automate outreach, follow-ups, and pipeline tracking over candidates you find elsewhere.
3. Marketplaces (Wellfound, LinkedIn) hold candidates who opted in — smaller pools, higher intent.
4. AI agents (Noon, HeroHunt, and hybrids like Fetcher) run the sourcing workflow themselves: interpret the role, search, screen, and engage, returning a shortlist instead of search results. This model is newest, and it's where most of the category's investment is going — our take on it is in the AI sourcing rankings.
Note for procurement teams: "sourcing tools" also describes e-sourcing/RFx software for buying goods and services. That's a different category — see our disambiguation page.