The Best AI Voice Agents for Small Business
An AI voice agent answers or makes phone calls and acts on them. For a small business, ready-made products like Upfirst, Smith.ai and Autocalls.ai are the easiest start. Developer platforms like Vapi, Retell and ElevenLabs Agents give more control but need someone to build and test the agent. Bland and Synthflow aim at enterprises.
Last checked: against our verified listings (each vendor's page was read when the listing was verified; dates are on each tool page). Not affiliated with the companies listed. Based on public information — not tested by us. How we check.
Voice agent vs IVR vs answering service
A phone menu (IVR) makes callers press buttons. An AI voice agent talks to the caller in plain language, and the products below can book appointments, take messages or qualify the caller. A traditional answering service uses people; some AI products, such as Smith.ai, offer live human agents as an option. For the receptionist use case in depth, see our AI receptionist guide and AI phone answering service guide.
Ready-made products vs platforms
| Tool | Type | Self-serve signup | Pricing as published | Best for |
|---|---|---|---|---|
| Upfirst | Ready-made product | Yes | Starter $24.95/mo (30 calls, $1.50 per extra call), Premium $59.95/mo (90 calls, $1/extra), Pro $159.95/mo (300 calls, $0.75/extra), Scale $299/mo (600 calls, $0.70/extra), Custom above 600 calls; annual billing 20% off. 14-day free trial, no credit card required. | Small businesses that want an affordable AI receptionist priced per call — law firms, real estate, property management, contractors, salons, vets and more. |
| Smith.ai | Ready-made product | Yes | AI Receptionist: Free $0/mo (25 real calls/mo, $3 per extra call); Pro from $150/mo (75 calls); Enterprise from $500/mo (300 calls); billed per call, month-to-month, 30 days' notice to cancel. Human receptionist plans from $300/mo | Small businesses and law firms that miss calls and want them answered and booked automatically. |
| Autocalls | Ready-made product | Yes | Starter $34/mo (120 min, 3 parallel calls), Pro $129/mo (700 min), Agency $249/mo (1,700 min), Agency White Label $419/mo (3,500 min); extra minutes $0.09–$0.20; yearly billing '2 months free' (shown as $27 / $103 / $199 / $355 per month). No setup fees. No free trial stated. | Law firms (and other small businesses) that want a self-serve AI phone receptionist for intake, consultation booking and after-hours calls, priced per minute. |
| Vapi | Platform to build on | Yes | Pay as you go from $0 with $5 free credits ($0.05/min Vapi hosting plus provider costs, 1 free inbound US number); Core $29/mo prepaid; Pro 10% of hosting fee, $999/mo minimum; Premier custom | Developers and product teams building custom phone agents into their own software. |
| Retell AI | Platform to build on | Yes | Pay as you go: $0.07-$0.31/min for voice agents, $0.002+/message for chat agents; $10 in free credits to start; Enterprise custom | Businesses and developers building custom AI phone agents for support, booking or outbound calling. |
| ElevenLabs Agents | Platform to build on | Yes | Free plan ($0/mo, 15 minutes of calls); Starter $6/mo; Creator $22/mo; Pro $99/mo; Scale $299/mo; Business $990/mo (first-month discounts on Starter and Creator); extra calls $0.080/min; LLM and telephony billed separately; Enterprise custom | Teams and developers building custom voice agents for support, scheduling or sales. |
| Bland AI | Platform to build on | Yes | Start: $0.14/min, $0 platform fee; Build: $0.12/min plus $299/month platform fee; Enterprise: custom (talk to our team); call transfer time billed extra ($0.05/min Start, $0.04/min Build) | Enterprises in regulated industries automating high-volume phone calls. |
| Synthflow | Platform to build on | No | Enterprise only: sold as an annual enterprise agreement scoped to your call volume, phone system, integrations and launch support; no free plan or trial; contact sales for a price | Mid-size and enterprise companies automating high call volumes. |
Prices are as each vendor listed them when we verified the page; they change, so confirm on the vendor's site.
By need
- Answer calls for a small business: Upfirst (priced per call) and Smith.ai. 24/7 call answering; answers every call, only missed calls, or only after-hours calls — your choice.
- Law offices: Autocalls lists new-client intake: case type, contact, incident and injury details, urgency — routed to the right attorney. Smith.ai and Upfirst also list law firms as a fit.
- Developers building custom agents: Vapi, Retell AI and ElevenLabs Agents. ElevenLabs Agents is the only one of the three with a free plan. See Vapi alternatives.
- Enterprise call volumes: Bland AI and Synthflow; Synthflow lists enterprise contracts from $30,000 a year.
What to check before you buy
- Handoff: what happens when the caller needs a person, and who gets the call.
- Call recording: whether calls are recorded and what notice your state requires. Ask the vendor.
- Real cost: per-call and per-minute plans add overage fees; developer platforms add model, voice and telephony costs on top.
- Try it first: use a free plan or trial where listed and call it yourself with your hardest questions.
Cost and setup: yourself or with an expert
Ready-made products can usually be started without a developer. Platforms are rated setup level 3 in our listings. If you would rather not build it, our expert setup service can install it for you. See the voice and phone category for every listing.
All tools compared
| Tool | Best for | Free plan | Easy-Start | Pricing summary (vendor) | Our label |
|---|---|---|---|---|---|
| Upfirst | Small businesses that want an affordable AI receptionist priced per call — law firms, real estate, property management, contractors, salons, vets and more. | No | 8/10 | Starter $24.95/mo (30 calls, $1.50 per extra call), Premium $59.95/mo (90 calls, $1/extra), Pro $159.95/mo (300 calls, $0.75/extra), Scale $299/mo (600 calls, $0.70/extra), Custom above 600 calls; annual billing 20% off. 14-day free trial, no credit card required. | Based on public information — not tested |
| Smith.ai | Small businesses and law firms that miss calls and want them answered and booked automatically. | Yes | 8/10 | AI Receptionist: Free $0/mo (25 real calls/mo, $3 per extra call); Pro from $150/mo (75 calls); Enterprise from $500/mo (300 calls); billed per call, month-to-month, 30 days' notice to cancel. Human receptionist plans from $300/mo | Based on public information — not tested |
| Autocalls | Law firms (and other small businesses) that want a self-serve AI phone receptionist for intake, consultation booking and after-hours calls, priced per minute. | No | 8/10 | Starter $34/mo (120 min, 3 parallel calls), Pro $129/mo (700 min), Agency $249/mo (1,700 min), Agency White Label $419/mo (3,500 min); extra minutes $0.09–$0.20; yearly billing '2 months free' (shown as $27 / $103 / $199 / $355 per month). No setup fees. No free trial stated. | Based on public information — not tested |
| Vapi | Developers and product teams building custom phone agents into their own software. | No | 8/10 | Pay as you go from $0 with $5 free credits ($0.05/min Vapi hosting plus provider costs, 1 free inbound US number); Core $29/mo prepaid; Pro 10% of hosting fee, $999/mo minimum; Premier custom | Based on public information — not tested |
| Retell AI | Businesses and developers building custom AI phone agents for support, booking or outbound calling. | No | 6/10 | Pay as you go: $0.07-$0.31/min for voice agents, $0.002+/message for chat agents; $10 in free credits to start; Enterprise custom | Based on public information — not tested |
| ElevenLabs Agents | Teams and developers building custom voice agents for support, scheduling or sales. | Yes | 10/10 | Free plan ($0/mo, 15 minutes of calls); Starter $6/mo; Creator $22/mo; Pro $99/mo; Scale $299/mo; Business $990/mo (first-month discounts on Starter and Creator); extra calls $0.080/min; LLM and telephony billed separately; Enterprise custom | Based on public information — not tested |
| Bland AI | Enterprises in regulated industries automating high-volume phone calls. | No | 6/10 | Start: $0.14/min, $0 platform fee; Build: $0.12/min plus $299/month platform fee; Enterprise: custom (talk to our team); call transfer time billed extra ($0.05/min Start, $0.04/min Build) | Based on public information — not tested |
| Synthflow | Mid-size and enterprise companies automating high call volumes. | No | 2/10 | Enterprise only: sold as an annual enterprise agreement scoped to your call volume, phone system, integrations and launch support; no free plan or trial; contact sales for a price | Based on public information — not tested |
Frequently asked questions
What is the best AI voice agent platform?
It depends on who builds it. For developers, the platforms we list are Vapi, Retell AI, ElevenLabs Agents, Bland AI and Synthflow. For a small business that only wants calls answered, ready-made products such as Upfirst, Smith.ai and Autocalls need much less setup. We have tested none of them.
What is the cheapest AI voice agent?
Among our listings, Smith.ai lists a free AI plan limited to 25 real calls a month and ElevenLabs Agents lists a free plan with 15 minutes of calls. Upfirst starts at $24.95/mo with a 14-day free trial. Cheapest depends on your call volume, so work out your monthly calls or minutes first.
Are there open-source AI voice agents?
Open-source voice frameworks exist, but we have not listed or tested any, so we cannot compare them here. Every tool in this guide is a commercial product.
Can an AI voice agent replace a receptionist?
These products answer calls 24/7, book appointments and pass details on. Smith.ai also lists optional live human agents and Autocalls routes urgent calls to an on-call attorney, which shows handoff to a person is a feature to check before you buy.
Sources: the vendor pricing and product pages linked from each tool page; features from our listings. Get the weekly newsletter for new tools.
