What's the main difference between Nexa and Retell AI?

Nexa is ai + human backup; Retell AI is ai only. That is the real decision here, not the price.

Nexa vs Retell AI

Neither publishes a price. Both make you talk to sales before you learn what it costs.

Both pages checked by August 19, 2026

NexaAI + human backup: Pricing not published; no published plan; People-powered 24/7 call answering, client intake, inbound and outbound sales and live chat/text service for home services, healthcare, legal and real estate businesses, with an optional Voice + AI agent that can hand calls off to human agents.
Retell AIAI only: Pricing not published; no published plan; Developer-oriented platform to build, test, deploy and monitor AI voice and chat agents, billed a la carte per minute: a Retell voice-infrastructure rate plus a separately priced text-to-speech voice, a separately priced LLM and separately priced telephony.

Nexa is ai + human backup; Retell AI is ai only. That is the real decision here, not the price.
Nexa can put a human on the line; Retell AI is bot-only.
Retell AI offers a trial (New accounts start with $10 in free trial credits, no payment method required. You'll only need to add one if you want to purchase a phone number.); Nexa advertises none.

Capability	Nexa	Retell AI
Live transferCan hand a hot caller to a human mid-call.	Yes	Yes
Books appointmentsWrites to a real calendar, not just a message.	Yes	Yes
Text follow-upSends the caller a text — link, quote, confirmation.	Yes	Yes
Outbound callsCalls leads back, not just answers.	Yes	Yes
SpanishHandles a Spanish-speaking caller end to end.	Yes	Yes
Human backupA person takes over when the bot is stuck.	Yes	No
Call recordingsYou can listen to what it actually said.	unstated	Yes
TranscriptsSearchable text of every call.	unstated	Yes
Spam screeningKills robocalls before they reach you.	unstated	unstated
Custom voicePick or clone the voice callers hear.	unstated	Yes
APIWire it into your own systems.	unstated	Yes

"unstated" means the vendor doesn't claim it in their own documentation. It is not the same as no — it means nobody will put it in writing.

Plan	Published price	Includes	Over that
Nexa 100	not published	100 min	If you go over the minute allowance for any given billing cycle, every additional minute will be charged at your base rate.
Nexa 300	not published	300 min	If you go over the minute allowance for any given billing cycle, every additional minute will be charged at your base rate.
Nexa 500	not published	500 min	If you go over the minute allowance for any given billing cycle, every additional minute will be charged at your base rate.

Plan	Published price	Includes	Over that
Pay-as-you-go	$0.07-$0.31/min for AI Voice Agents	—	—
Enterprise	Custom Pricing for AI Voice Agents	—	—