Vapi vs Agent.so

Vapi is a voice agent platform for building, testing, and deploying phone agents that handle real customer calls at scale. Teams use it for customer support, lead qualification, appointment scheduling, and outbound sales, with sub-500ms latency and orchestration built in. The platform has handled over one billion calls and is used by enterprises including Amazon Ring, Intuit, and ServiceTitan.

The product is developer-first but accessible through a dashboard UI as well. You configure voice, conversation flow, telephony, and integrations in one place, then connect 200+ built-in models or bring your own for speech-to-text, LLM, and text-to-speech. Live tool calling and MCP support let agents fetch data and trigger actions mid-call.

Vapi targets engineering teams shipping production voice agents and enterprises that need compliance, uptime guarantees, and dedicated support. Scale customers get SSO, RBAC, SOC 2, HIPAA, PCI, data residency, and a dedicated account team.

Agent.so puts hundreds of role-specific AI agents and a custom agent builder behind one login. You chat with pre-built experts spanning marketing, coding, tutoring, and dozens of other fields, create your own agents in seconds without code, and train them on your files, links, and sitemaps. The platform routes chats through models from OpenAI, Anthropic, Google, Meta, xAI, DeepSeek, and other labs so you are not tied to a single chatbot subscription.

Most agent builders hand you a blank canvas and expect you to wire prompts yourself. Agent.so front-loads the library with 250+ ready-made agents, an Apps Hub for one-shot tasks like subject lines and ad copy, and a Shards currency for pay-as-you-go access to advanced models and skills. That structure suits people who want specialist chats on day one rather than a week of setup.

Freelancers, consultants, and small teams use Agent.so for marketing drafts, coding help, and training agents on client knowledge bases. Agent Plus costs $19 per month at the early-access rate (regular $29) and includes unlimited messages, custom agent training, and 3,000 monthly Shards. A free tier remains available with conversation depth limits and caps on how many custom agents you can run at once.