8 Best Retell AI Alternatives in 2026
Retell AI is one of the best platforms for building AI phone agents. It is pay as you go, sounds natural, and ships call flows, testing and a built-in CRM.
It’s still a platform. Someone writes the prompt, wires the calendar and CRM, tests every change and pays for the model and voice separately.
The quick answer: Carly is the best Retell AI alternative for a business that wants AI on its own phone line without building anything. It answers when your team can’t, calls new leads within a minute, texts from the same number, books on your team’s real calendars and logs every call in one team inbox and CRM. Copy one prompt into ChatGPT or Claude, grab a number, and you’re live. For developers, Vapi and ElevenLabs Agents are the closest platforms, and Bland suits high volume.
US list prices from each vendor’s own pricing page, checked October 19, 2026.
Retell AI alternatives compared
| Alternative | Kind | Price | Who builds it |
|---|---|---|---|
| Carly | Ready to run: calls, texts and email in one team inbox | Free Zapier-style workflows; AI agents from $35/mo | Nobody. Copy one prompt into ChatGPT or Claude |
| Vapi | Developer platform | $0.05/min plus providers at cost | Your developer |
| Bland | Developer platform, managed builds on Enterprise | $0.14/min, or $0.12/min plus $299/mo | Your developer, or Bland on Enterprise |
| ElevenLabs Agents | Developer platform | Plans from free to $990/mo | Your developer |
| Synthflow | Enterprise platform | Contracts from $30,000/yr | Synthflow, with your team |
| Thoughtly | Lead follow-up agents for revenue teams | Quoted by sales | Thoughtly, with your team |
| AgentPhone | Phone numbers for your own agent | $3/number, 13¢/min | Your developer |
| Smith.ai | AI receptionist with live staff available | Free for 25 calls; Pro $150 for 75 | You |
Why people look past Retell AI
- It needs a builder. Retell sends teams without a developer to its certified partner agencies, so you pay two vendors for one phone line.
- The per-minute price is a sum. Voice infrastructure, voice and model add up to roughly $0.07 to $0.31 a minute, with telephony ($0.015 a minute on a Retell number) and add-ons on top. Silence and hold time bill too.
- Calendars run through other tools. Native booking is Calendly, Cal.com or GoHighLevel; Google or Outlook booking needs one of those or a custom function.
- Support depends on plan. Pay-as-you-go accounts get community and email support; 24/7 support is Enterprise.
Full details in Retell AI.
1. Carly
Carly is what most Retell builds are trying to become, with nothing to build. You write the rules in plain English and Carly follows them exactly, the same way on every call.
- Answers your line 24/7, or only when your team doesn’t pick up. Spanish speakers get answered in Spanish.
- Calls new web leads within about a minute, answers in hand, then texts and emails if they miss it (speed-to-lead tutorial).
- Books straight onto Google and Outlook, round robin across your team’s real calendars, while the caller is on the line.
- Texts from the same number: two-way texts, a missed call text back, reminders to a list and group texts.
- Hands callers to a person through ring groups or a phone menu.
- One team inbox and CRM for every call, transcript, summary, voicemail, text and email, written to Carly’s CRM, HubSpot, Salesforce or Dynamics 365.
- Runs from ChatGPT or Claude. Build the agents from a chat, place calls, send texts, watch a live call and steer it (how it works).
Carly connects to thousands of apps, so leads arrive from your forms, ads and CRM, and every call can trigger free Zapier-style workflows.
Setup: copy this prompt into ChatGPT or Claude, grab a number, and you’re live.
Carly business setup prompt
Paste this into ChatGPT, Claude or any AI. It walks you through the rest.
Help me connect Carly Teams to this chat: read https://carlyassistant.com/team/mcp.txt and follow it. If you can't open links, tell me how to add https://carlyassistant.com/team/mcp to you as a custom MCP connector, then I'll sign in.
- Best for: sales and service teams that want AI on the phones today, with no developer and no partner agency.
- Pricing: Free Zapier-style workflows; AI agents from $35/month. Get started.
2. Vapi
Vapi lets engineers choose every part of the voice stack: transcriber, model, voice and carrier.
- Best for: developers who want more control than Retell gives.
- Pricing: $0.05 a minute for hosting plus providers at cost, roughly $0.08 to $0.13 a minute before telephony.
- Limitations: more assembly than Retell, and HIPAA is a $2,000-a-month add-on. See Vapi alternatives.
3. Bland
Bland trains its own voice models and bundles model, transcription and voice into one per-minute rate.
- Best for: high call volume, or teams that want Bland’s engineers to build on Enterprise.
- Pricing: $0.14 a minute on Start; $0.12 a minute plus $299 a month on Build.
- Limitations: Start caps you at 100 calls a day and Build at 2,000. See Bland AI alternatives.
4. ElevenLabs Agents
ElevenLabs’ agent platform runs on its credit plans, with its well-known voices built in.
- Best for: teams that care most about voice quality and will build in-house.
- Pricing: plans from free (15 minutes) to $990 a month.
- Limitations: telephony, booking and CRM are yours to wire.
5. Synthflow
Synthflow is an enterprise platform with a visual flow designer, its own telephony and automated QA.
- Best for: enterprises that want a vendor-led build.
- Pricing: contracts from $30,000 a year.
- Limitations: no self-serve tier. See Synthflow alternatives.
6. Thoughtly
Thoughtly sells AI agents that call, text and email new leads within seconds and book meetings, with two-way CRM sync.
- Best for: revenue teams with heavy inbound lead volume.
- Pricing: Flex, Scale and Enterprise, all quoted by sales.
- Limitations: no public prices or self-serve start.
7. AgentPhone
AgentPhone gives your own agent a phone number, with calls and texts arriving at one webhook.
- Best for: developers who already have an agent and only need the phone layer.
- Pricing: $3 a number per month, 13¢ a voice minute, 2¢ a text.
- Limitations: you build everything above the number.
8. Smith.ai
Smith.ai sells a ready AI receptionist plus live receptionists.
- Best for: businesses that want a human backstop behind the AI.
- Pricing: free for 25 calls a month; Pro $150 for 75 calls.
- Limitations: per-call pricing climbs on busy lines. See Smith.ai alternatives.
How to pick a Retell AI alternative
- Building for your own business, not a product? Go with Carly. Nothing to build, test or maintain.
- Building a voice product and want more control? Vapi.
- High volume and want a vendor to build it? Bland Enterprise or Synthflow.
- Only need a number for an agent you already have? AgentPhone.
- Need texting too? Leads answer texts more than calls. Carly texts from the same business number.
Before calling leads with any AI, get consent: AI voices count as artificial voices under the TCPA. This isn’t legal advice.
FAQ
What is the best alternative to Retell AI?
Carly, for businesses that want AI answering and lead calls on their own number without building. For developers, Vapi or ElevenLabs Agents.
Is there a cheaper alternative to Retell AI?
Vapi’s hosting is $0.05 a minute plus providers, often $0.08 to $0.13 a minute in total. For inbound answering only, Smith.ai is free for 25 calls a month. Carly offers free Zapier-style workflows; AI agents from $35/month.
Retell AI vs Vapi: what’s the difference?
Retell bundles more of the stack and adds call flows, testing and a built-in CRM. Vapi lets you swap every component and pay each provider at cost. Both need a developer.
Is there a Retell AI alternative with no code?
Yes. Carly runs on plain-English rules. Paste one prompt into ChatGPT or Claude, grab a number, and build the agent from the chat.
Can a Retell alternative book on Google Calendar or Outlook?
Carly books directly on Google and Outlook calendars, round robin across your team, while the caller is on the line.
Ready to automate your busywork?
Carly schedules, researches, and briefs you—so you can focus on what matters.
See what people say
"Before Carly, I relied on a Calendly link, but the whole process felt impersonal and not very professional. Carly changed that by handling all the back-and-forth, so I'm no longer stuck in endless email threads trying to line up schedules.
Now Carly reaches out to candidates, shares my real-time availability, lets them pick a slot, then sends a Zoom link and drops it straight into my calendar. She sends reminders to both of us before each call, which has significantly reduced no-shows and last-minute confusion.
On top of scheduling, Carly acts like a full executive assistant, sending me my schedule the night before so I can prepare for each call. It reminds me of the old x.ai assistant, but Carly is noticeably smarter, faster, and better suited to my healthcare recruitment business."
