Two things separate a useful database from a spreadsheet of names: how it is searched and how it is kept current. Search by role, company type and location is table stakes; the better ones understand what a company actually does rather than trusting its industry code, and let you search by meaning rather than exact keywords.
Contact quality is the other half. Verified work emails cut bounce rates; direct dials and mobiles decide whether phone outreach is possible at all. Ask any provider which contact fields are verified and how.
Buzzlist holds roughly 270 million people, plus deeper profiles on about 115 million business people with checked work emails. All of it is searchable with filters or by describing who you want in a sentence. Sizes and coverage.
