by Clay
Combine many data sources to build and enrich lead lists
The free plan includes 500 actions per month, 100 data credits per month, unlimited seats and tables, and allows running up to 200 rows per table.
by Hunter
Find and verify professional email addresses
Finds email addresses by company domain and checks if they are valid. Includes simple cold email campaigns.
Free plan. The free plan includes 50 credits per month, unlimited team members, and the ability to connect 1 email account.
The cheapest paid plan is Starter at $34/month billed monthly.
From their website — their pricing page, checked 2026-11-04
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by Clay
Combine many data sources to build and enrich lead lists
The free plan includes 500 actions per month, 100 data credits per month, unlimited seats and tables, and allows running up to 200 rows per table.
by Apollo.io
Find B2B contacts and email them from one place
The free Starter plan stays free with no time limit and allows connecting Gmail accounts only.
by ZoomInfo
Large B2B database of contacts and companies
The page offers a free trial for various use cases such as prospecting, deal execution, and data enrichment.