Vapi alternatives: six voice AI platforms, and who each one suits

Short answer: the closest swap for Vapi is Retell AI, which bundles more of the pieces into one product. Bland AI is the one to look at if you want a single flat price per minute. Bolna is the one for Indian languages and rupee billing, ElevenLabs Agents for voice quality, and Pipecat or LiveKit Agents if you would rather run everything yourself. Synthflow publishes only enterprise pricing now.

We checked every price and limit below on each company's own site on 21 September 2026. Voice AI pricing moves every few months, so treat the numbers as a snapshot.

Why people look for a Vapi alternative

Vapi is built for developers. You pick the transcription, the model, the voice and the telephony, and pay Vapi $0.05 a minute on top. That flexibility is the point. Here is what tends to push people away:

• The bill has five lines. Once Deepgram, OpenAI, ElevenLabs and a phone carrier are added, a call costs roughly 8 to 14 cents a minute, and the total is hard to quote to a client up front.
• Concurrency. The free plan allows 4 simultaneous calls, and each extra line costs $10 a month.
• The knowledge base takes files only. Vapi does not read a website. And the agent won't search the files unless the system prompt names the query tool, which catches out a lot of first builds.

Vapi alternatives compared

Platform	Price per minute	Monthly fee	Knowledge base	Best for
Vapi (for reference)	$0.05 + providers, about $0.08 to $0.14	$0, Core $29, Pro from $999	Files only	Developers who want every choice
Retell AI	$0.07 to $0.31, all in	None	URLs, site crawl, files, Drive, Notion	Agencies, CRM-connected clients
Bland AI	$0.14 (Start), $0.12 (Build)	$0 or $299	10 on Start, 50 on Build	One flat price, outbound volume
ElevenLabs Agents	$0.08 standard, $0.16 burst	Plans from $0 to $990 with included minutes	Files, URLs, text; full context up to about 300,000 characters	Voice quality, 70+ languages
Bolna	6¢, about 4.2¢ to 4.6¢ on pilots	None	Knowledge base and RAG	India, Hindi and regional languages
Synthflow	Not published	From $30,000 a year	Not published	Enterprise contracts
Pipecat / LiveKit Agents	Your providers' cost	None (open source)	Whatever you build	Teams that want to own the stack

Retell AI: the closest swap

Retell gives you what Vapi makes you assemble: one per-minute price ($0.07 to $0.31, depending mostly on the model), telephony at $0.015 a minute, 20 concurrent calls included and $10 in free credits. Its knowledge base reads single pages or whole websites and re-crawls them every 24 hours. It also takes files in more than twenty-five formats, pasted text, and synced Google Drive, OneDrive and Notion. The first 10 knowledge bases are free and each one after that is $8 a month. It runs chat agents too, from $0.002 a message.

Pick it if you build for clients who use GoHighLevel, HubSpot or Salesforce, or you want voice and chat from one place. There is a full Vapi vs Retell breakdown.

Bland AI: one price, no provider bills

Bland charges one rate that includes the model, transcription and voice ("No token charges", as its pricing page puts it). The Start plan is $0.14 a minute with no monthly fee, capped at 100 calls a day and 10 at once. The Build plan is $299 a month, then $0.12 a minute, with 2,000 calls a day and 50 at once. Each plan comes with knowledge bases, 10 on Start and 50 on Build.

Pick it if you want to quote a client one number per minute and never see a provider invoice, or you run outbound campaigns where the daily call cap matters.

ElevenLabs Agents: if the voice is the product

ElevenLabs prices agent calls at $0.08 a minute standard and $0.16 a minute at burst, and every plan includes some minutes: 15 free, 75 on Creator ($22), 275 on Pro ($99), up to 3,738 on Business ($990). It covers 70+ languages. Its knowledge base takes files (up to 20 MB each), URLs and text. One detail matters a lot here: a document of up to roughly 300,000 characters can go into the agent's full context instead of through retrieval.

Pick it if callers will judge the business by how the agent sounds, or your client's knowledge base is small enough to skip retrieval altogether.

Bolna: for Indian languages and rupee billing

Bolna shows prices in both dollars and rupees. Pay-as-you-go is 6 cents a minute. The pilot bundles are $300 for about 6,500 minutes and $500 for about 12,000, and both include 25 concurrent calls. It lists 10+ Indian languages, including Hindi, Hinglish, Tamil and Telugu. It connects to Twilio, Plivo and Vobiz for telephony, supports a knowledge base with RAG, and lets you bring your own model and voice keys. New accounts get $5 in credits.

Pick it if your clients' customers call in Hindi or a regional language, or you are billing Indian businesses and want the cost in rupees.

Synthflow: now an enterprise sale

When we checked, Synthflow's pricing page listed enterprise contracts starting at $30,000 a year, with no self-serve tiers or per-minute rate published. For a single small client that rules it out. For a large one, talk to their sales team.

Pipecat and LiveKit Agents: build it yourself

Both are open-source frameworks for voice agents. You write the agent, host it, and connect your own transcription, model, voice and telephony, so you pay only those providers and your servers. You get full control over latency, routing and retrieval. The price of that is that you maintain all of it.

Pick it if you have engineers and a reason to own the stack, such as data residency, unusual call flows or very high volume.

Before you switch

Moving platforms fixes pricing, concurrency and language support. It does not fix wrong answers. If your Vapi agent quotes the wrong price or makes up an opening time, the same knowledge base will do the same thing on Retell, Bland or Bolna, because every one of them cuts your document into chunks and hands the model a few per turn.

So before you switch, look at what the agent is reading. Every sentence with a price, a time or a size should name the product it belongs to. Every question a caller is likely to ask should get a sentence, even when the answer is "not confirmed". How to write a chatbot knowledge base walks through it.

KB Builder does that part for you. Give it a client's website and documents and it returns a knowledge base that loads into any of the platforms above, plus a list of what the website never says.

Once you've chosen: set up its knowledge base properly

Each platform stores and searches a knowledge base differently: what files it takes, how many pieces it hands the agent per turn, and whether the agent searches at all without being told. Our setup guides cover that from each platform's own documentation, with the prompt lines we add after our own live calls:

• Setting up the Retell AI knowledge base
• Setting up the Bland AI knowledge base
• Setting up the ElevenLabs knowledge base
• Setting up the Bolna knowledge base
• Setting up the Synthflow knowledge base

KB Builder is made by MasterBlocks, which also makes SpeakEdge, a voice agent platform. We left SpeakEdge off this list. We are not affiliated with any platform named here.