Comparing Retell AI and Voiceflow? Both are AI Agents & Chatbots and Voice & Phone AI tools in the directory, which is why buyers put them on the same shortlist. Below is a side-by-side look at how they price, what they integrate with, and when each is the better fit, so you can pick on the facts rather than either vendor's own sales page.
| Attribute | Retell AI | Voiceflow |
|---|---|---|
| Pricing | Paid · $0.07/min | Freemium · Free; $60/mo |
| Founded | 2023 | 2019 |
| Categories | AI Agents & Chatbots Voice & Phone AI | AI Agents & Chatbots Voice & Phone AI |
| Integrations | Twilio Vonage Telnyx Cal.com n8n Make GoHighLevel custom SIP trunking | Zendesk Salesforce Twilio HubSpot Shopify Airtable Google Sheets Gmail |
Retell AI is a platform for building AI phone agents that answer and place calls. You compose an agent from interchangeable parts: a speech-to-text layer, your choice of LLM, a voice from providers like ElevenLabs, and telephony via Twilio, Vonage, Telnyx, or your own SIP trunk. The platform handles the hard real time bits, interruption handling, latency, call transfer, and IVR navigation, and adds testing, monitoring, and post call analysis aimed squarely at contact center and front desk workloads.
The company came out of Y Combinator's Winter 2024 batch, founded in 2023, with Evie Wang among the cofounders. It grew unusually fast for a seed stage company: a $4.6 million seed led by Alt Capital in September 2024 arrived alongside a reported $3 million in annual revenue within months of launch. Named customers include telehealth company Ro, plus BPOs and contact center operators.
Pricing is published and usage based, which is refreshingly rare. Retell quotes $0.07 to $0.31 per minute all in, depending on your voice and model choices, with components itemized: text-to-speech from $0.015 per minute, LLM costs from $0.003 to $0.16 per minute, US telephony around $0.015 per minute. Every account includes 20 concurrent calls, extra concurrency is $8 per line monthly, phone numbers cost $2 monthly, and new accounts get $10 in free credits. Enterprise plans with dedicated infrastructure are custom.
Choose Retell if you have some technical ability, want a working phone agent this week, and value published per minute economics you can model before committing. Its contact center tilt (batch calling, warm transfer, IVR traversal) makes it a natural fit for support lines. Look elsewhere if you want a fully managed enterprise deployment with a vendor doing the tuning, or a pure no-code experience for a non-technical team.
Read the full Retell AI listing → · See Retell AI alternatives →
Voiceflow is a visual platform for designing, testing, and shipping AI agents across chat and voice. Teams build conversation logic on a collaborative canvas, ground agents in knowledge bases, and deploy to web chat, phone lines via Twilio, and messaging channels. For support work specifically, native integrations let an agent create and update Zendesk tickets, touch Salesforce records, or cancel a Shopify order mid conversation, and anything else is reachable through REST APIs, custom functions, and MCP.
The company was founded in Toronto in 2019, led by CEO Braden Ream, and grew from conversation design tooling into a full agent platform. It has raised $35 million, most recently a $15 million round from OpenView in August 2023 at a $105 million valuation, following a 2021 round led by Felicis. Its own announcements cite more than 130,000 users and customers including The Home Depot, US Bank, BMW, Vodafone, State Farm, and JP Morgan.
Pricing moved to a credit system in April 2025. Third party trackers list a free starter tier, Pro from $60 monthly with 10,000 credits, Business from $150 monthly, and custom Enterprise, with extra editor seats at $50 each. Credits are consumed by every message, call, and model invocation, and reports say agents stop responding when credits run out mid cycle. Note that Voiceflow's own pricing page now steers business buyers toward a sales conversation, so treat published tiers as a floor.
Choose Voiceflow if a mixed team of designers, support leads, and developers needs to own agent behavior together, and you want one canvas covering both chat and voice. Look elsewhere if you want pure per minute phone economics (Retell, Vapi) or a fully managed enterprise deployment; and budget carefully, since seats plus credits add up faster than the sticker price suggests.
Read the full Voiceflow listing → · See Voiceflow alternatives →
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