AI voice and phone agent platforms

By César Murga · 7 tools

AI voice agent platforms run phone agents that book appointments, answer questions and route calls. Retell AI lists pay-as-you-go pricing of $0.07–$0.31 per minute with a drag-and-drop canvas; Vapi charges $0.05 per minute for hosting plus provider costs and suits developers.

Voice is billed by the minute, so compare the all-in cost (platform plus speech, model and telephony) rather than the headline rate. Non-technical owners usually prefer a visual builder; developers may want Vapi’s configurability.

Retell AI

AI voice agents for phone calls, built on a drag-and-drop canvas.

Starts at: $0.07–$0.31 per minute (pay as you go)
Free option: $10 free credits
Self-host: No

Vapi

Developer-first platform for building and running voice agents, billed per minute.

Starts at: $0.05/min Vapi hosting + provider costs
Free option: $5 free credits
Self-host: No

Voiceflow

AI agent platform for customer experience teams, across voice and chat.

Starts at: Usage-based (free trial for agencies)
Free option: Free trial, no credit card
Self-host: No

Botpress

AI-native customer support platform with conversation-based pricing and AI usage included.

Starts at: $150/mo (Plus)
Free option: Free plan
Self-host: No

Bland AI

Enterprise voice AI platform for regulated, high-stakes phone calls, priced per minute.

Starts at: $0.14/min (Start)
Free option: 2 credits + inbound number, no card required
Self-host: Yes

Fin (by Intercom)

AI agent for customer conversations with outcome-based pricing at $0.99 per outcome.

Starts at: $0.99 per outcome
Free option: 14-day free trial
Self-host: No

Synthflow

Enterprise voice AI platform for automated phone calls, with in-house telephony and contracts starting at $30,000 per year.

Starts at: $30,000/yr (Enterprise)
Free option: See vendor pricing page
Self-host: No

How do you choose a voice & phone agents tool?

Estimate monthly call minutes and price them all-in.
Check concurrency limits (Retell lists 20 free concurrent calls).
Test latency and voice quality with a real call before committing.
Confirm live monitoring and human takeover.

Related guides

Frequently asked questions

How much does an AI phone agent cost per minute?

Retell AI lists $0.07–$0.31 per minute; Vapi lists $0.05 per minute for its hosting, with speech, model and telephony providers billed on top.

Want the agent built for you instead?

Tell us the outcome you need (e.g. “qualify every inbound lead within 5 minutes”). We match you with a vetted no-code agent builder who works on n8n, Make, Zapier, Botpress or Voiceflow.

Describe your agent →

Written and fact-checked by César Murga, Founder & Editor

Entrepreneur focused on AI-powered sales systems, with 15 years in consultative sales and international admissions. NoCode Agents researches no-code AI agent builders from vendors’ own pricing pages, docs and announcements, and links every claim to its source. Last updated 26 October 2026.

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