{
  "id": 19319895,
  "title": "Retell AI vs Vapi for Agencies: What Changes When Every Client Needs a Login",
  "url": "https://urgent.news/2026/11/10/retell-ai-vs-vapi-for-agencies-what-changes-when-every-client-needs-a",
  "topic": "ai",
  "section": "AI",
  "published": "2026-11-10T10:44:59.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/voicedash/retell-ai-vs-vapi-for-agencies-what-changes-when-every-client-needs-a-login-j7o"
  },
  "original_language": "en",
  "account": "When evaluating Retell and Vapi for agencies that need to manage multiple clients with separate data and logins, the key differences lie in how each platform handles tenant isolation, event routing, and call history retrieval.\n\nRetell provides hard isolation through workspaces, with each client having its own workspace containing all agents, conversation flows, LLMs, knowledge bases, voices, and phone numbers. However, Retell does not offer an API to create or switch workspaces, requiring manual setup for every new client. This means agencies must create one Retell API key per client and store them encrypted, assigning the appropriate key to each request. Retell webhooks can be configured at the account or agent level, with the agent-level webhook taking precedence over the account-level webhook. The platform uses a 10-second timeout with retries and signature verification for security. For call history, Retell provides a POST /v3/list-calls endpoint with filter criteria to retrieve calls based on various conditions.\n\nVapi, on the other hand, allows agencies to design the tenant boundary themselves, either by using separate organizations per client or a single organization with tenant tagging. The platform's isolation model depends on how the agency chooses to implement it. Vapi also offers a server URL priority stack, with events routed to the appropriate tenant based on the configured URLs. Authentication can be managed using various credential types, but agencies must ensure that the server URL comes from saved organization configuration for proper credential attachment. For call history retrieval, Vapi provides a POST /v2.1/assistants/:assistant_id/history endpoint with filtering options to retrieve call data for a specific client.",
  "summary": "Disclosure: I'm Nabeel, founder of VoiceDash, a client portal for Retell agencies. It only supports Retell today, which is worth knowing before you read a Retell vs Vapi piece from me. TL;DR: Most Retell vs Vapi comparisons stop at voice quality and per-minute price. For an agency, the harder question is what happens when every client needs their own data, their own keys and their own login.…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}