Hundreds of millions of emails sent, engines running for clients every day. This is the exact stack behind it.

The data workbench where lists, enrichment and personalization come together.
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The sending platform behind our cold email volume.
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LinkedIn outreach at agency scale.
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Social signal tracking that starts conversations half-warm.
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See which companies are on your website right now.
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Company signals: hiring, funding, tech and news triggers.
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Waterfall email and phone finding across 20+ providers.
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Email finding with standout European coverage.
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The prospect database for company-first TAM mapping.
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Lookalike company discovery from your best customers.
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Sending domains and mailboxes at scale, in minutes.
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The CRM where client pipeline lives.
Read our take →We build and run the whole stack for B2B companies: your market mapped, outreach running, meetings on your calendar.
Book a call →Yes. Every tool on this page runs inside client engines every day, and we're certified in several of them. Nothing here is listed because it's trendy. If a tool stops earning its place in the stack, it comes off the page.
No. A working cold email motion needs four things: sending domains and mailboxes (Zapmail), a sending platform (Instantly), data (AI Ark plus an email finder), and somewhere to track pipeline (HubSpot). The rest compound results, but they come later, not on day one.
Infrastructure first, always. New domains and mailboxes need two to three weeks of warmup before they can carry real volume. While they warm, map your market and build lists. Then launch sending, and add the signal layer once the base motion is running.
Coverage. No single provider finds every address. Chaining BetterContact and Prospeo in a waterfall pushes match rates far above any one source, and built-in verification keeps bounce rates low, which is what protects deliverability at volume.
Timing. Trigify, Warmly and PredictLeads tell you who is engaging, visiting or changing right now, so outreach lands while a company is in motion instead of at random. On our engines, the warmest replies consistently come from signal-triggered plays.
Everything meets in Clay. Signals flow in from Trigify, Warmly and PredictLeads, accounts get qualified and personalized in Clay, sending goes out through Instantly and HeyReach on Zapmail infrastructure, and results land in the CRM. One flow, no CSVs passed around.