The AI Customer Acquisition platform.
Symphony42 builds AI Selling Agents that turn paid consumer Internet traffic into qualified calls and completed sales. A business pays to bring an interested consumer forward; a Symphony42 agent answers immediately, explains the offer, establishes eligibility, resolves objections, and helps the consumer complete the purchase or the next step — and the systems around that agent acquire the traffic, execute the permitted actions, and measure what happened. The consumer experiences a capable representative. The business experiences a conversion layer between its traffic and its revenue.
Symphony42 is DoublePositive, Part Two.
In 2004 our founder, Sean Fenlon, co-founded DoublePositive and invented Pay-per-Call transfer leads — outcome-based pricing for live-transferred consumer calls, the model through which most form-fill leads across B2C verticals still travel. He predicted AI Customer Acquisition on stage at LeadsCon in 2014 and incorporated Symphony42 on November 12, 2021 to build it — before large language models existed. The thesis never changed; the technology caught up. Text agents in 2022, voice agents in 2024, qualify-and-transfer revenue in 2025, and in 2026 the AI Selling Agent that closes the sale.
Built with AI, before the first hire.
Symphony42’s platform was built with zero employees on payroll — by a founder who has shipped with AI since December 2022, directing frontier models through an operating layer we call Symphony42 OS, alongside an equity-compensated bench of veterans who built and rebuilt the platform because they believed in the outcome. Score, our measurement system, went from specification to unattended daily production in twelve days. Overture, our interaction layer, in eleven. Every startup says “AI-first.” Ours has the original AI-first founder.
Our name
Orchestration is the art of assigning the right instrument to the right moment. Symphony42 does not build language models, voice synthesis, or telephony; it orchestrates them — assigning the right model to the right moment in the right conversation — and judges the result by what the consumer hears. The 42 is a deliberate Douglas Adams reference, and April 2 is the day we publish our annual update.
Backed by the builders of Customer Acquisition
Symphony42 is backed by the people who built the industry it is transforming — founders and operators of LendingTree, LowerMyBills.com, Jornaya, ActiveProspect, MightyHive, Advertising.com, LiveIntent, and Connectiv among them — and advised by a roster of Internet founders and Customer Acquisition executives.
Headquartered in Maryland. Delaware C-Corporation. Sales conversion is our North Star metric.