Voice AI agents that answer and place calls on Rexenda phone numbers and on WhatsApp. They speak natural Spanish and English, switch to the caller's language and let callers interrupt; when someone needs a person, the agent rings a teammate who takes over from the browser softphone.
A Retell AI alternative with voice agents, WhatsApp and CRM in one place
Retell AI is a platform for building AI voice agents, with APIs and SDKs for developers, a no-code builder and per-minute pricing that adds up voice infrastructure, the language model, the voice and telephony. Rexenda is a business application where the same AI agent answers and places phone and WhatsApp calls, replies on WhatsApp and other chat channels, and works inside the CRM, calendar and quotes your team already uses there.
- Free plan, no time limit
- No credit card required
Why teams look for a Retell AI alternative
Pricing in parts. According to Retell's pricing page, the per-minute cost combines voice infrastructure, the language model, the voice and telephony, from $0.07 to $0.31 per minute, with phone numbers and extra concurrent calls billed separately.
The rest of the stack. Retell focuses on the voice agent itself; the CRM, calendar, payments and team inbox come from other tools that you connect through integrations or its API.
WhatsApp. Retell's documentation says it has no built-in integrations with third-party chat platforms such as WhatsApp; its chat agents run on a website widget, on SMS through Twilio or through its API.
What Rexenda does differently
The same agent replies on WhatsApp through the official API, connected in minutes with Meta's Embedded Signup, and also on Instagram, Messenger, web chat, email and SMS. Calls and chats land in one inbox with each contact's full history.
Quotes with an acceptance link, card payment links paid into your own Stripe account and, in Mexico, CFDI e-invoices, all sent from the same conversation as the call.
No code to write: start from a template or describe the job, and during the call the agent books meetings in a calendar synced with Google and Outlook, saves the caller's details and updates the pipeline. An agent goes live only after a successful test call.
How to switch
Recreate your agent in Rexenda from a template or by describing its job, and reuse the instructions, questions and knowledge content you wrote for Retell. Buy a number in the app or request a port of your current one where the carrier allows it (some countries require identity documents), connect WhatsApp with Meta's Embedded Signup and import your contacts from a CSV file. Make a test call, then switch on incoming calls, an outbound campaign or both.
When Retell AI may still be the right choice
Retell may suit you better if your team writes code and wants to control agents through APIs and SDKs, needs to bring its own carrier through SIP trunking, or runs very high call volumes with concurrency sized to match. Rexenda has no public API with keys today, only outgoing webhooks, and it does not connect your own SIP trunk.
Questions
How is Rexenda different from Retell AI?
Retell AI is a platform for building voice agents, with APIs, SDKs and per-minute pricing by component. Rexenda is a business application where AI agents handle phone calls, WhatsApp calls and WhatsApp messages and work inside a built-in CRM, calendar and quotes. Setting up an agent takes no code, and there is a free plan forever.
How much does an AI voice call cost in Rexenda?
Voice minutes are paid from the AI credits included in your plan: each minute of AI voice call uses 12 credits, and you can buy extra packs. Phone numbers have their own monthly charge. You can start on the free plan forever with no credit card, and current prices for plans and credits are on the pricing page.
Can Rexenda answer WhatsApp calls with AI?
Yes. Once your WhatsApp number is connected with Meta's Embedded Signup and calling is on, the voice agent answers WhatsApp calls the same way it answers phone calls, and it can also call contacts who have agreed to receive WhatsApp calls. The transcript and summary land in the same inbox as the chat.
Facts about Retell AI checked against its public website in October 2026.
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