Retell-based Builders
Custom AI phone agent implementations built on voice AI infrastructure
8.0
Score
Category bucket for agencies and builders using voice AI infrastructure to deliver receptionist outcomes.
Directory
12 vendors live in the directory. Filter by what you actually need — integrations, vertical fit, after-hours, handoff — and sort by editor score or starting price.
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Custom AI phone agent implementations built on voice AI infrastructure
8.0
Score
Category bucket for agencies and builders using voice AI infrastructure to deliver receptionist outcomes.
Custom conversational AI builders that can deliver receptionist experiences
7.8
Score
Another partner bucket for custom implementations and bespoke phone workflows.
No-code AI voice agents with pay-as-you-go pricing
7.6
Score
No-code builder for AI voice agents marketed at enterprises and agencies. Explicit integrations with HubSpot, Salesforce, GoHighLevel, Cal.com, Google Cloud, and Zapier. Supports multilingual calls (English + Spanish called out specifically), 24/7 operation, appointment booking, and human handoff for high-intent leads. SOC 2 / HIPAA / PCI DSS / GDPR posture stated on their site.
24/7 answering and customer contact platform
7.4
Score
Established answering service brand useful in comparison pages around after-hours coverage and service quality.
Programmable enterprise AI phone agents with per-minute pricing
7.4
Score
Developer-focused voice AI platform marketed at enterprises in healthcare, finance, and insurance. Bland publishes a broad integration list (Salesforce, HubSpot, Twilio, Slack, Notion, Zapier, Calendly, Cal.com, Genesys, Five9, NICE CXone, Talkdesk, Amazon Connect, SIP) and supports 40+ languages, 24/7 operation, and human handoff with context. Best fit for teams comfortable wiring their own integrations rather than buying a turnkey SMB receptionist product.
API-first voice AI platform for developers (SOC 2 + HIPAA + PCI)
6.8
Score
Voice AI infrastructure that markets itself as 'API-first by design' with 750K+ developers and Fortune 100 customers (Ring/Amazon, GoHealth, Instawork, Kavak). Vapi handles the underlying voice infrastructure so engineering teams can build custom agents on top. Compliance posture stated: SOC 2, HIPAA, and PCI compliant. Multilingual support and appointment scheduling are called out as supported use cases.
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