How Monosend & Autotest.ing acquired 200+ developer leads with zero ad spend.

The Challenge: High CAC in Developer Tooling

Monosend is an API-first email marketing automation platform built specifically for developers. Their ideal customers are software engineers and technical founders. However, acquiring developer leads through traditional channels like Google Ads and LinkedIn was becoming prohibitively expensive, with CAC (Customer Acquisition Cost) routinely exceeding $150 per lead.

Meanwhile, Autotest.ing, an AI-powered continuous testing infrastructure platform, was facing the exact same challenge. Their autonomous testing software is also sold directly to engineering and QA teams.

Both companies possessed highly engaged email lists of developers, but had tapped out their immediate networks. They needed a way to reach new, qualified technical audiences without burning venture capital on paid ads.

"We knew our target audience was hanging out elsewhere in the ecosystem. The problem was finding non-competing tools that shared our Exact ICP, and figuring out how to collaborate securely." — Sarah Jenkins, VP of Growth at Monosend

The Solution: AI Partner Discovery

Monosend connected their HubSpot CRM to CoMarket.ing and uploaded their product description emphasizing "Email API," "React email templates," and "Developer Experience."

Within minutes, CoMarket.ing's NLP algorithms generated an ICP vector profile and surfaced Autotest.ing. The platform flagged a 94% Match Score, correctly identifying that while their core functionalities (Email APIs vs. AI Testing) were entirely different, their target user—the modern, API-first software developer—was identical.

Secure Account Mapping

Before committing to a campaign, both teams used CoMarket.ing's Zero-Trust Account Mapping. By comparing hashed identifiers, they discovered a goldmine: 4,200 non-overlapping prospects in their combined CRM databases (developers who used Autotest.ing but not Monosend, and vice versa).

The Campaign: "Shipping Confidently"

Leveraging CoMarket.ing's Campaign Builder, the two companies organized a joint virtual workshop titled "Shipping Confidently: From Automated Testing to Deliverable Emails."

The campaign flow generated automatically via CoMarket.ing included:

• A co-branded registration landing page.
• A cross-promotion email sequence sent to both user bases.
• Automated lead routing back into their respective CRMs post-event.

The Results

Because the audience was highly relevant and the recommendation came from a trusted vendor they already used, the campaign dramatically outperformed traditional paid channels.

By partnering through CoMarket.ing, Monosend and Autotest.ing bypassed the crowded ad auctions entirely. They exchanged immense value, provided actionable educational content to their overlapping audiences, and proved that strategic partnerships are the most efficient growth channel for B2B SaaS.