Vapi gives developers an API-first voice platform. SayTrue delivers a managed customer-service agent whose daily operation stays with the client team.
The Vapi column uses Vapi's public platform, documentation and pricing pages checked on the date below.
| Dimension | SayTrue | Vapi |
|---|---|---|
| Channels | Phone, a web chat widget, Facebook and Instagram inboxes, and a sales inbox. WhatsApp is not available. | Inbound and outbound phone agents are the core product; voice can be embedded in web apps, and a server-side Chat API supports text conversations. |
| Grounding | Answers come from an approved knowledge base and every lookup is logged. | External data, tool calls including MCP, and authenticated internal APIs can ground responses; a knowledge-base capability appears in the support example. |
| Human handover | Working hours govern live transfers; structured tickets carry the request to a department when a transfer is not attempted. | Warm call transfers are supported, while Squads route between assistants and preserve context. |
| Setup | Bytecode guides configuration and a real test call gates go-live; the client team then runs the agent day to day. | Self-serve dashboard setup is developer-led through APIs, SDKs and a CLI, with a sales path for enterprise. |
| Pricing model | Prices are not published; an engagement starts with a demo and pilot conversation. | Public usage-based Build billing uses call minutes and messages; Scale uses an annual platform contract with committed volume. Model costs pass through unless customers use their own provider keys. |
| Tools and testing | Read-only GET connectors require human enablement before the agent can use them. | The platform supports tool calls and publishes testing tooling for identifying hallucination risk before production. |
A logged answer trail. Every knowledge lookup is recorded, so a disputed answer can be traced to the retrieval event.
Three explicit outcomes. A turn ends grounded, escalated or with no source; the product does not invent a confidence score.
A managed go-live gate. Bytecode guides the setup and a real test call must pass before the configured agent goes live.
Grounded in your knowledge, honest about its limits, and handed to your team the moment it should be.