Clay

If you've ever built a prospect list by hand, you know the problem. One data provider has the email, another has the phone number, a third knows the person just changed jobs, and none of them agree on the company's headcount. You end up with five browser tabs, a messy spreadsheet and a CRM full of stale records. Clay is built to fix exactly that mess. Its pitch is blunt: "Infrastructure to get any data, run agentic workflows, and launch GTM plays."

The core idea is waterfall enrichment. Instead of betting on one vendor, Clay lets you "combine multiple data providers for the best coverage," pulling from a data marketplace of 200+ providers in one place. On top of that data layer sit AI research agents (Claygents, account agents and the newer global agent built for long-running tasks), signal tracking for job changes and promotions, and activation tools that sync ad audiences to LinkedIn, Meta and Google or push contacts into Clay's native sequencer. There's also a CLI/API and a plugin you can install straight into your coding agent from Clay's GitHub repo, which tells you who this is really for: technical GTM teams who'd rather build a system than buy a static list.

The traction is real. Clay says more than 500,000 GTM teams use it, and the NY Times reported employee share sales at a $5b valuation. But don't confuse popularity with simplicity. This is a toolkit, not a turnkey prospecting app, and the paid plans start at $149/mo per the listing. A lot of the product pages on clay.com also still show placeholder copy, so you'll learn most of the details by signing up for the free trial, not by reading the site. If you have someone who enjoys wiring up data workflows, Clay is one of the strongest options out there. If you just want a list of leads by Friday, it may be more machinery than you need.