Topo vs Retell AI
Side-by-side comparison of AI visibility scores, market position, and capabilities
Paris AI sales agent deploying custom-trained SDRs for B2B outreach at 10x lower cost than human SDRs; YC W24 $500K G2 Top 25 Best New Software 2024 competing with Artisan and 11x for AI-powered sales development automation.
About
Topo is a Paris, France-based AI sales agent platform — backed by Y Combinator (W24) with $500,000 raised in a pre-seed round in April 2024 — deploying custom-trained AI sales development representatives (SDRs) for B2B companies that understand the company's specific product, competitive positioning, ideal customer profile, and sales methodology to identify high-quality leads, craft personalized outreach, and secure meetings at 10x lower cost than traditional human SDR teams. Founded in 2023 by Dan Elkaim, Léonard Henriquez, and Robin Philibert, Topo was named a G2 Top 25 Best New Software for 2024 with revenue estimates between $3.6 million and $11 million from its 9-person team, demonstrating strong early market adoption for AI-powered sales outreach.
Developer-first voice AI infrastructure API for building phone agents; low-latency streaming pipeline with multi-LLM and telephony support competing with Vapi for production voice applications.
About
Retell AI is a voice AI infrastructure platform providing APIs and tools for building conversational AI phone agents with low latency, natural turn-taking, and integration with major telephony providers and LLM providers. Founded in 2023 and headquartered in San Francisco, Retell AI has rapidly gained developer traction for its straightforward API, extensive documentation, and emphasis on production-grade reliability for AI voice applications in customer service, sales, and healthcare use cases.
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