Synthflow

Synthflow, a venture-backed company (Accel, Singular, Atlantis Labs) with forward-deployed engineers, automates phone calls with conversational AI voice agents — handling customer service, appointment booking, lead qualification, and call routing for inbound and outbound calls. It integrates with 200+ business tools (CRMs, calendars, data systems), offers a visual flow designer for building call workflows, real-time monitoring with Auto-QA analytics, and runs on an in-house telephony network with sub-100ms latency and a 99.99% uptime guarantee — plus SOC 2, HIPAA, PCI DSS, and GDPR compliance for regulated industries. Pricing is pay-as-you-go: design and test call flows for free, then pay only for actual calls/chats conducted, with no upfront cost. The company reports 65 million+ customer calls handled and 4 million hours saved across enterprise and BPO customers. Good fit for a business that wants voice AI handling routine calls at genuine telephony-grade reliability, with cost tied directly to actual call volume.