> ## Documentation Index
> Fetch the complete documentation index at: https://docs.retellai.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction to Retell

> Retell is a platform to build, test, deploy, and monitor AI voice and chat agents with telephony, prompts, tools, and analytics built in.

## Build

Retell agents are node-based flows or single prompts, with call handling, a knowledge base, and integrations built in. See the full [build overview](/build/overview) for everything you can configure, starting with your agent type.

<CardGroup cols={2}>
  <Card title="Conversation Flow Agent" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/conversation-flow.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=abd3344c17639f33e0da53f34262ea74" href="/build/conversation-flow/overview" width="1280" height="864" data-path="images/introduction/conversation-flow.png">
    Drag-and-drop, node-based flows for structured, high-stakes calls.
  </Card>

  <Card title="Single Prompt Agent" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/single-prompt.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=08b3cdd684f8362b24e6227a9b6c586c" href="/build/single-multi-prompt/prompt-overview" width="1280" height="864" data-path="images/introduction/single-prompt.png">
    Define your whole agent with one prompt.
  </Card>

  <Card title="Multi-modality" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/multi-modality.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=8a0a39d5110c4fe99f8a6f7acb63f2d2" href="/build/create-chat-agent" width="1280" height="864" data-path="images/introduction/multi-modality.png">
    Voice agents for calls, chat agents for text.
  </Card>

  <Card title="Call center features" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/call-center-features.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=20f5f9524aaa32273d534506506e06cc" href="/build/conversation-flow/call-transfer-node" width="1280" height="864" data-path="images/introduction/call-center-features.png">
    Warm transfer, IVR navigation, DTMF capture, and more.
  </Card>

  <Card title="Knowledge base" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/knowledge-base.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=965637c3be0500345a8d0ce4fbc4935f" href="/build/knowledge-base" width="1280" height="864" data-path="images/introduction/knowledge-base.png">
    Crawl a website or upload documents your agent retrieves from.
  </Card>

  <Card title="Out-of-the-box integrations" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/integrations.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=fa769ca1950b1f65d1d8ca68c034819b" href="/integrations/crm-overview" width="1280" height="864" data-path="images/introduction/integrations.png">
    Cal.com, HubSpot, and Salesforce today. Calendly, Google Drive, and Zendesk coming soon.
  </Card>

  <Card title="Post-call analysis" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/post-call-analysis.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=d045b95a2b81ffd31a15fe639f603d20" href="/features/post-call-analysis-overview" width="1280" height="864" data-path="images/introduction/post-call-analysis.png">
    Built-in call success and sentiment scoring, plus custom fields to your CRM.
  </Card>

  <Card title="Conductor" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/conductor.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=b8b70f8f3f572130b02f230d87e1c6fd" href="/conductor/overview" width="1280" height="864" data-path="images/introduction/conductor.png">
    Retell's AI copilot that builds, tests, and refines your agent with you.
  </Card>
</CardGroup>

## Test

Test in text or real audio, manually or automatically, before an agent ever takes a real call. See the [testing overview](/test/test-overview) to compare every method.

<CardGroup cols={2}>
  <Card title="Testing tools" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/test-call.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=bb80fc4aa4bcba254f10d1213c3f58a3" href="/test/llm-playground" width="1280" height="864" data-path="images/introduction/test-call.png">
    Chat, call, or debug your agent in the Playground.
  </Card>

  <Card title="Simulation testing" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/simulation-testing.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=5e3f8db0d6ec3c5520168b5e916227fb" href="/test/llm-simulation-testing" width="1280" height="864" data-path="images/introduction/simulation-testing.png">
    Run graded test cases to catch regressions before launch.
  </Card>

  <Card title="A/B testing" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/ab-testing.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=3baac421008ffbca536565c02e8b94d7" href="/deploy/ab-testing" width="1280" height="864" data-path="images/introduction/ab-testing.png">
    Compare agents or prompts by splitting live traffic between them.
  </Card>
</CardGroup>

## Deploy

<CardGroup cols={2}>
  <Card title="Purchase phone number" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/purchase-phone-number.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=84bab3d56700747b16caa1c25732e278" href="/deploy/purchase-number" width="1280" height="864" data-path="images/introduction/purchase-phone-number.png">
    Buy a Retell-managed US or Canada number, no provider account needed.
  </Card>

  <Card title="Bring your own telephony" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/sip-trunking.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=0834e31662355871796584e81250e629" href="/deploy/custom-telephony" width="1280" height="864" data-path="images/introduction/sip-trunking.png">
    Connect your own provider over SIP trunking.
  </Card>

  <Card title="Voice widget" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/voice-widget.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=1ab76b417ff6ca446aa5c4ad41047fd5" href="/deploy/chat-widget" width="1280" height="864" data-path="images/introduction/voice-widget.png">
    Embed a voice call widget on your website.
  </Card>

  <Card title="Web call" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/create-web-call.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=593d642e0255eb3141c74317626789d5" href="/deploy/web-call" width="1280" height="864" data-path="images/introduction/create-web-call.png">
    Connect a web call from your frontend with the Web SDK.
  </Card>
</CardGroup>

## Monitor

<CardGroup cols={2}>
  <Card title="Live call monitoring" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/live-call-monitoring.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=196951a59eb855f3ce3983d5a1ced7f5" href="/features/live-monitoring" width="1280" height="864" data-path="images/introduction/live-call-monitoring.png">
    Follow live transcripts, listen in, or take over a call.
  </Card>

  <Card title="Custom analytics" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/custom-analytics.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=2b1c9c77f10d64ceb73250ed4b374cba" href="/features/analytics-dashboard" width="1280" height="864" data-path="images/introduction/custom-analytics.png">
    Build custom dashboards for your call and chat metrics.
  </Card>

  <Card title="AI QA" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/ai-qa-overview.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=37978136bd6afc10acb77e2d58549cc5" href="/ai-qa/overview" width="1280" height="864" data-path="images/introduction/ai-qa-overview.png">
    Automatically score production calls for quality and accuracy.
  </Card>
</CardGroup>

## Data

<CardGroup cols={2}>
  <Card title="Call & chat history" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/call-history.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=ae9d7d3a8607727d2208fe64ce4aabbd" href="/features/session-history" width="1280" height="864" data-path="images/introduction/call-history.png">
    Browse past calls and chats with transcripts and analysis.
  </Card>

  <Card title="CRM" img="https://mintcdn.com/retellai/vOFwMkoXjciff3UJ/images/introduction/crm.png?fit=max&auto=format&n=vOFwMkoXjciff3UJ&q=85&s=55d3a2639da032d02c652b17f09bb7e3" href="/integrations/crm-overview" width="1280" height="864" data-path="images/introduction/crm.png">
    Sync contacts and push call data to Salesforce or HubSpot automatically.
  </Card>
</CardGroup>

## Developer friendly

Build entirely from the dashboard with no code, or go fully programmatic with the API, SDKs, and an MCP server.

<CardGroup cols={2}>
  <Card title="API reference" icon="code-xml" color="606A78" href="/api-references/overview">
    Manage agents, calls, and numbers programmatically.
  </Card>

  <Card title="SDKs" icon="package" color="606A78" href="/get-started/sdk">
    Official Node.js and Python client libraries.
  </Card>

  <Card title="MCP server" icon="blocks" color="606A78" href="/get-started/mcp-server">
    Manage agents from Cursor, Claude Desktop, and more.
  </Card>

  <Card title="Webhook" icon="webhook" color="606A78" href="/features/webhook-overview">
    Real-time call events, no polling required.
  </Card>
</CardGroup>

## Next up

Ready to dive in? Start here.

<CardGroup cols={2}>
  <Card title="Quickstart" icon="rocket" color="22D3EE" href="/get-started/quick-start">
    Build your first phone agent in 15 minutes.
  </Card>

  <Card title="Voice Orchestration" icon="audio-waveform" color="22D3EE" href="/general/orchestration_overview">
    How STT, LLM, and TTS orchestrate into one voice stack.
  </Card>
</CardGroup>