Vapi is a developer platform for building voice AI agents; Dial is the full communication stack that gives an agent its own number, voice, SMS, WhatsApp, and iMessage. Here's how pricing, channels, and setup actually compare.
TL;DR
Vapi is a strong choice when your product *is* a voice agent — an API-first platform for composing STT, LLM, and TTS into enterprise-scale phone and web calls. Dial solves a different problem: giving an AI agent a complete communication identity. One number carries voice, SMS, WhatsApp, and iMessage at one all-in price, so an agent can verify accounts, text customers, and take calls without you assembling a telephony vendor, a model stack, and a messaging provider separately. If your agent needs to be reachable and reach out across channels — not just answer calls — that's Dial.
| Dial | Vapi | |
|---|---|---|
| What it is | Communication stack for AI agents — number, voice, SMS, WhatsApp, iMessage in one API | Orchestration platform for building voice AI agents |
| Voice pricing | $0.13/min with your own LLM · $0.22/min managed — all-in | $0.05/min platform fee + STT/LLM/TTS at cost (or BYO keys) + telephony |
| Phone numbers | $3/mo pay-as-you-go, or $20/mo flat-rate with US calls + SMS included | Free Vapi numbers (max 10, US national use only), or import from your own carrier |
| SMS | $0.02/msg US, 200+ countries — ready when the number is provisioned | Customer-initiated chat only, via your own 10DLC-approved Twilio number |
| Cold outbound texting | Yes — SMS and iMessage outbound supported | No — assistants can't send the first message |
| Included — same number, 180+ countries | Not supported | |
| iMessage / RCS | $250/mo iMessage number, messages free, automatic RCS/SMS fallback | Not supported |
| Bring your own LLM | Yes — text over WebSocket at $0.13/min | Yes — bring provider API keys (model cost drops to $0) |
| MCP server | Yes — remote MCP with OAuth; agents can self-provision | Yes — hosted MCP server for managing assistants and calls |
| Free tier | $5 credit, no credit card | $10 trial credit, no card |
| Compliance add-ons | No paid gates on core platform features | HIPAA $2,000/mo · Zero Data Retention $1,000/mo · SOC 2 on enterprise plan |
Based on each product's public documentation and published pricing as of July 5, 2026. Spotted something out of date? Email [email protected] and we'll fix it.
Vapi (vapi.ai) is an API-first platform for building and deploying voice AI agents. You compose the speech-to-text, LLM, and text-to-speech stack (bring your own provider keys or pay pass-through), and Vapi orchestrates the call with sub-500ms latency targets. It offers free US numbers (up to 10 per account), imports numbers from your own carrier account, web calls, a workflow builder, and a hosted MCP server. Voice is the core product; SMS exists only as customer-initiated chat through your own 10DLC-approved Twilio number.
Dial is the communication stack for AI agents: provision a real phone number in about 10 seconds and your agent can place and receive voice calls, send and receive SMS in 200+ countries, message on WhatsApp, and reach iMessage with automatic RCS/SMS fallback — all through one REST API, CLI, or MCP server. Pricing is all-in: $3/month per number pay-as-you-go (or $20/month flat-rate with US calls and SMS included), $0.13/min for calls with your own LLM, $0.22/min fully managed. $5 free credit, no credit card.
Vapi earned its position honestly. It's genuinely API-first, the latency engineering is real, and composing your own model stack — your STT, your LLM, your TTS, your keys — gives large teams control that bundled platforms don't. If you're building a high-volume enterprise voice product and you want to tune every layer of the pipeline, Vapi is one of the strongest platforms available, with client SDKs across web and mobile and a CLI with MCP support.
The comparison below isn't about Vapi being bad at voice. It's about what happens when your agent needs more than voice.
Vapi's $0.05/min is a platform fee, not a price. STT, LLM, and TTS bill on top at provider cost (unless you bring your own keys), and telephony passes through your own carrier account. Independent estimates put typical all-in Vapi costs at roughly $0.13–$0.31/min depending on the models you pick — and that's before your carrier's per-minute and number fees.
Dial's per-minute rate is the whole price. $0.22/min managed covers the model, the speech stack, and the telephony. $0.13/min self-hosted covers everything except the LLM you bring. There is no separate carrier bill because the number itself is Dial's product — $3/month, or $20/month flat-rate where US calls and SMS are included entirely.
| Cost item | Dial (managed) | Vapi |
|---|---|---|
| Platform / orchestration | Included in $0.22/min | $0.05/min |
| STT + TTS | Included | At cost, or BYO keys |
| LLM | Included ($0.13/min if you bring your own) | At cost, or BYO keys |
| Telephony | Included | Your carrier account (per-minute + number fees) |
| Phone number | $3/mo | Free (max 10, US-only) or your carrier's rate |
One invoice versus three or four. For a team running an agent in production, predictability is usually worth more than any single line item.
An agent that only speaks is an agent that stalls the moment a workflow leaves the phone call. Real agent work is cross-channel: receive the OTP text, confirm by SMS, follow up on WhatsApp, escalate to a call.
This is the architectural difference: Vapi orchestrates conversations on infrastructure you assemble; Dial *is* the infrastructure, designed so one number is the agent's identity across every channel.
Both platforms get you to a talking demo fast. The difference shows up on the path to production.
On Vapi, production SMS means registering a 10DLC brand and campaign through your Twilio account — carrier approval measured in weeks — and non-US numbers mean importing from a carrier. On Dial, dial onboard provisions a number in about 10 seconds and it can text immediately; an agent can even self-onboard through the MCP server or the CLI skill with no human in the loop.
Both platforms offer MCP servers, so on that axis they're peers — the difference is what the MCP tools control: Vapi's manage voice assistants; Dial's give the agent an actual phone.
For voice agents, yes — Dial offers managed voice calls at $0.22/min all-in or $0.13/min with your own LLM. But the platforms overlap more than they coincide: Vapi is a voice-agent orchestration layer you bring infrastructure to, while Dial is the communication infrastructure itself — number, voice, SMS, WhatsApp, and iMessage in one API.
Only in a limited way. Vapi's SMS chat requires a 10DLC-approved number from your own Twilio account, and conversations must be customer-initiated — the assistant cannot send the first message. Dial numbers send and receive SMS (including cold outbound) from the moment they're provisioned, at $0.02 per US message.
Vapi's platform fee is $0.05/min, but STT, LLM, and TTS bill on top at provider cost (or $0 if you bring your own API keys), plus telephony through your own carrier. Realistic all-in estimates run $0.13–$0.31/min. Dial's $0.22/min managed rate is the complete price, with the number itself at $3/month.
No. Vapi supports voice calls, web calls, web chat, and customer-initiated SMS via Twilio. Dial includes WhatsApp on the same number in 180+ countries and offers iMessage numbers with automatic RCS/SMS fallback.
Yes. Dial's self-hosted mode streams the conversation as text over a WebSocket, so your own model does the thinking while Dial handles telephony, speech, and turn-taking — at $0.13/min instead of $0.22/min managed.
Voice, SMS, WhatsApp, and iMessage through one API. $5 free credit, no credit card required.