7 best conversational AI platforms for outbound phone sales in 2026
Samuel Oram-Jones, 12 min read
The best conversational AI platforms for outbound phone sales in 2026 are Bland, Vapi, Synthflow, ElevenLabs, PolyAI, Sierra, and Decagon, and Bland ranks first because one company builds every model on a sales call. This ranking compares each platform on who builds the AI, how a campaign is launched, and what a minute costs, as of November 2026.
What are the best conversational AI platforms for outbound phone sales?
The best conversational AI platform for outbound phone sales overall is Bland, because the models that dial a lead list, hold the conversation, and hear the reply are all built and run by Bland, and the other six platforms each rely on outside companies for at least one of them.
Outbound phone sales means an AI agent calls a list of leads, qualifies each person who answers, books a meeting, hands a warm lead to a rep, and logs what happened. A caller who picks up an unexpected call decides within seconds whether to stay, so speed and a natural voice matter more here than on a call the customer started.
- Bland: Best overall for outbound calls at enterprise volume
- Vapi: Best for developers assembling their own outbound stack
- Synthflow: Best for sales-led teams that run campaigns under one annual contract
- ElevenLabs: Best for teams that already build on ElevenLabs voices
- PolyAI: Best for enterprises that want a managed, quoted agent
- Sierra: Best for enterprises buying outcome-priced agents
- Decagon: Best for support teams adding proactive outbound calls
What should buyers check in conversational AI platforms for outbound phone sales?
Buyers should check who builds each model on a call, because an outbound campaign sends the names and phone numbers of a lead list through every company in the call path, and each outside company is one more name in a security review.
Vapi takes its language model, transcription, and voice from other companies, Synthflow describes "proprietary orchestration and models from OpenAI, ElevenLabs, Deepgram, and custom in-house logic", and Sierra describes "combining frontier, open-weight, and proprietary models". ElevenLabs, PolyAI, and Decagon mix their own models with outside ones. Bland builds its language, speech, and transcription models itself.
A second check is how a list becomes calls. Bland runs batch calls from a CSV of recipients, with one agent staffing every call and each column available in the script as a variable, and Bland starts conversations from an API request or a schedule as well.
Synthflow runs campaigns with "scheduling, calling windows, dialing speed, and recipient outcomes", and Vapi has an example of a "voice AI outbound sales assistant with BANT data capture, CRM integration, objection handling, and automated follow-ups". Decagon and Sierra both offer outbound calling, and ElevenLabs says its agents "run outbound at scale".
The handoff is the third check, because a hot lead is worth little if the rep who picks up asks the prospect to start over. Bland offers warm transfers on Enterprise, so a team can send a qualified prospect to a person with the context intact.
Teams that also want an agent for the leads that reply can read how AI voice agents for sales teams and Best AI voice agents for lead qualification compare, and teams whose reps spend too long on each call can look at Voice AI agents to reduce average handle time.
Consent rules come next. Calls placed to people who never asked for them fall under laws such as the US Telephone Consumer Protection Act, so a buyer should ask each provider how it handles consent and disclosure. Synthflow says "Outbound AI calls are only placed in jurisdictions where the customer has confirmed user consent is collected", and Sierra says it supports compliant outbound communications.
Bland builds four TCPA guardrails in, covering AI disclosure, recording disclosure, self-introduction, and opt-out, and its guardrails can end a call, transfer it, or take a custom action when a call breaks one.
Messaging belongs on the list too, because a text after a missed call often gets the reply a voicemail does not. Bland runs branded iMessage agents natively on Enterprise, on the same pathways as voice, Sierra supports Apple Business Chat, and Vapi, Synthflow, ElevenLabs, PolyAI, and Decagon don't offer iMessage agents.
Proof at volume is the last check, and a demo can't show how a platform performs at volume. A customer replacing a manual process with a voice AI agent shows more, and Bland's own result sits under its entry below.
How do the 7 best conversational AI platforms for outbound phone sales compare?
These seven platforms differ most in how much of a sales call they build themselves.
1. Bland: Best overall for outbound calls at enterprise volume
What does it do? Bland is a full stack voice AI provider that builds and runs its own language, speech, and transcription models for inbound and outbound calls, with a visual builder called Pathways for connecting and testing steps. Bland says its batch calls "let you run high-volume call campaigns by uploading a list of recipients as a CSV", and Bland also runs SMS and web chat on Enterprise.
Who runs on it? Bland publishes sub-200ms latency, a 99.9% uptime SLA on every plan, and serves more than 250 enterprise customers. On Enterprise, concurrency is contracted to volume.
Who is it for? Bland suits enterprises and contact centers that want large outbound lists called, qualified, and handed to a rep. Enterprise customers get dedicated orchestration and dedicated GPUs run by Bland.
Pros
- No outside AI lab in the call path, so a security team reviews one AI company
- Bland Speech v3 ranked first of 13 AI voices on Audio Realism Bench on 4 August 2026
- Staged releases that pause a new agent version when it performs worse than the last
- Alarms on latency, silences, transcription quality, and API errors
- Native iMessage agents on Enterprise, sharing pathways with voice
- Forward-deployed engineers on Enterprise
Cons
- Overkill for a small prototype, because Bland is built for production calls at volume
Pricing: Self-serve Start is $0.14 per minute with no platform fee, and self-serve Build is $0.12 per minute with a $299 monthly platform fee. Phone is billed separately at carrier cost.
Enterprise pricing is custom, set with Bland's sales team. Enterprise adds native iMessage agents, warm transfers, a BAA, SSO, data residency, dedicated GPUs run by Bland, and forward-deployed engineers, alongside SMS and web chat.
Idaho Housing and Finance Association saves $750,000 a year by replacing its IVR with Bland, which handles 4,000 inbound calls a day and cut average call time by 20%.
"We save thousands of dollars a day."
Greg Blake, Chief Information Officer, Idaho Housing and Finance Association
2. Vapi: Best for developers assembling their own outbound stack
What does it do? Vapi is a developer platform that hosts voice agents and bills the language model, transcription, and voice from other companies on top at cost. Vapi says it passes these through with "no markup", so a team picks and wires every provider itself.
Who is it for? Vapi suits developers who want to pick and swap each AI provider themselves and can run a stack of several vendors.
Pros
- A team can choose every model and voice
- Vapi has an outbound sales assistant example with CRM integration and objection handling
- Imported numbers are billed by a customer's own phone provider
Cons
- Language model, transcription, and voice bill from other companies on top of $0.05 hosting
- Twilio outbound minutes cost $0.014 a minute on top
- No iMessage agents
Pricing: $0.05 per minute for hosting, plus a language model, transcription, and voice at provider cost, which Vapi says run up to $0.0452, $0.0099, and $0.0238 a minute, before phone.
3. Synthflow: Best for sales-led teams that run campaigns under one annual contract
What does it do? Synthflow sells voice agents through one annual enterprise agreement that scopes in telephony, integrations, and launch support, and it offers WhatsApp and SMS chat beside voice. Synthflow runs outbound campaigns through a Platform API and says it is built on "proprietary orchestration and models from OpenAI, ElevenLabs, Deepgram, and custom in-house logic".
Who is it for? Synthflow suits mid-market and enterprise teams that want a sales-scoped platform and are happy to sign an annual agreement before they launch.
Pros
- Campaigns with scheduling, calling windows, and dialing speed
- Holds SOC 2 Type 2 and ISO/IEC 27001, with HIPAA and GDPR coverage
- Forward-deployed engineers launch agents with a customer's team where the agreement includes launch support
Cons
- Annual enterprise agreement only, with no free plan or trial and no rate by the minute
- No iMessage agents
Pricing: Annual agreement only, with no public per-minute rate, and purchased phone numbers cost $1.50 a month.
4. ElevenLabs: Best for teams that already build on ElevenLabs voices
What does it do? ElevenLabs sells ElevenAgents, a platform for voice and text agents built on its own speech and transcription models, with a choice between its Realtime models and an outside language model. ElevenLabs charges no telephony fee, and a connected provider such as Twilio bills its own carrier charges.
Who is it for? ElevenLabs suits developer and enterprise teams that want ElevenLabs voices inside an agent platform and will pick a language model themselves.
Pros
- Runs its own speech and transcription models
- Says its agents "run outbound at scale"
- Plans from $6 a month with a call allowance
Cons
- Calls past a plan's concurrency limit cost $0.16 a minute, double the standard rate
- Language model usage billed on top in Custom mode
- Eleven v3 ranked 12th of 13 AI voices on Audio Realism Bench on 4 August 2026
- No iMessage agents
Pricing: $0.08 per minute past a plan's allowance, with plans from $6 a month and language model usage billed on top in Custom mode.
5. PolyAI: Best for enterprises that want a managed, quoted agent
What does it do? PolyAI builds and runs a voice agent for a customer on quoted per-minute pricing, with its own Raven model family beside GPT and Claude models. It also sells a Dialog-RSN-1 model API at 2¢ per connected minute, without telephony or orchestration.
Who is it for? PolyAI suits large consumer-facing companies that want it to build and run their agent for them.
Pros
- PolyAI handles the build and the ongoing running
- Holds SOC 2 Type II and ISO/IEC 27001
Cons
- No public rate for a managed agent
- Its contract says "the total handle time is rounded up to the next 30-second increment"
- No iMessage agents
Pricing: A managed agent is quoted per minute with no public rate.
6. Sierra: Best for enterprises buying outcome-priced agents
What does it do? Sierra sells a managed AI agent platform for customer service across chat, voice, email, SMS, and WhatsApp, and says its voice channel serves "inbound and outbound calls". Sierra says its agents orchestrate "outbound and inbound interactions over days or weeks", and it supports Apple Business Chat among its messaging channels.
Who is it for? Sierra suits enterprise customer experience teams that want a managed agent and are happy to negotiate pricing.
Pros
- Holds PCI DSS Level 1 Service Provider certification, SOC 2, HIPAA, and FedRAMP High through Knox Systems
- Supports Apple Business Chat among its messaging channels
Cons
- No self-serve mode, and no published rate because Sierra prices by outcome
- Sierra says it "automatically switches between LLM providers"
Pricing: Sierra says it "gets paid only when we complete a task for you", and publishes no rate.
7. Decagon: Best for support teams adding proactive outbound calls
What does it do? Decagon sells AI agents for customer support across chat, email, and voice, priced per conversation or per resolution. Decagon says its outbound calling will "unlock proactive engagement by initiating outbound calls for sales, support, and customer updates".
Who is it for? Decagon suits support teams that want one agent across chat, email, and voice, so a revenue team that mostly dials cold lists is a looser fit.
Pros
- One agent across chat, email, and voice
- Holds SOC 2 Type II, HIPAA, and PCI DSS 4.0.1
Cons
- No public rate, with pricing per conversation or per resolution
- Decagon says it uses "models from the frontier labs, along with our models developed by Decagon Labs"
- No iMessage agents
Pricing: Per conversation or per resolution with no public rate, and Decagon says "Larger resolution commitments lower the rate."
How were these platforms ranked?
Platforms were compared on who builds the AI, how a list becomes calls, how a qualified lead reaches a person, price per minute before phone, compliance, and voice realism, with weight on what enterprise outbound teams need. Every claim about a platform comes from its own public pages as read in November 2026, and voice scores come from Design Arena's chart of 4 August 2026.
Closer comparisons sit in Bland vs Vapi, Bland vs Synthflow, Bland vs ElevenLabs, Bland vs PolyAI, Bland vs Sierra, and Bland vs Decagon. A related ranking covers conversational AI platforms for ticket deflection.
How much do conversational AI platforms for outbound phone sales cost?
Outbound phone sales is billed per minute of call, but what a minute includes differs, so each price below states its basis. Bland's self-serve Start plan is $0.14 per minute for its language model, transcription, and speech together, and Bland replaced an earlier flat $0.09 rate with self-serve Start and Build in December 2025.
Enterprise pricing is custom, set with Bland's sales team.
Every total below is AI before phone, with Vapi and ElevenLabs at their calculator defaults. Vapi's card adds hosting to the top of each range Vapi says its providers run, ElevenLabs' card adds the calculator's default model to a call minute, and phone is billed by whichever provider a customer connects. Synthflow, PolyAI, Sierra, and Decagon publish no per-minute rate, so no bill can be added up for them.
| Vendor | What a minute pays for | Total per minute | Phone |
|---|---|---|---|
| Bland Start (self-serve) | All AI: model, transcription, speech $0.14 | $0.14 before phone | Billed separately at carrier cost |
| Vapi | Hosting $0.05, Transcription $0.0099, Language model $0.0452, Voice $0.0238 | $0.1289 before phone | Free on Vapi numbers, billed on top on Twilio at up to $0.014 a minute |
| ElevenLabs Agents | Call minute $0.08, Gemini 2.5 Flash, the calculator's default model $0.0029 | $0.0829 before phone | No ElevenLabs telephony fee, with a connected provider billing on top |
Bland Start (self-serve): Self-serve Start has no platform fee. Self-serve Build is $0.12 a minute plus $299 a month. Phone and transfers bill separately. Vapi: Hosting plus the top of each range on Vapi's pricing calculator, before phone. ElevenLabs Agents: ElevenLabs call minute plus its pricing calculator's default model, before the customer's own phone provider.
Which outbound phone sales platform sounds most like a real person?
Bland Speech v3 ranked 1st of 13 AI voices on Design Arena's Audio Realism Bench on 4 August 2026, at 1365, and every outside voice in those results that the other platforms here let a customer choose scored lower.
- #1BlandBland Speech v31365
- 4thOpenAI, on VapiGPT Realtime 21119
- 6thCartesia, on PolyAISonic 3.51096
- 12thElevenLabsEleven v3Near the bottom938
- Not rankedVapi's own voicesNot ranked
- Not rankedPolyAI's own voicesNot ranked
Ranks are among 13 AI voices, and each rival shows the highest listed voice a customer can choose on it, named for the company that made it. Real human recordings scored 1500, at the right edge of this scale. Bars start at 600, not zero. Source: Design Arena's published results.
On Vapi the highest outside voice was OpenAI's GPT Realtime 2, 4th at 1119.
ElevenLabs' Eleven v3 ranked 12th at 938, and it is the one outside voice in those results that Synthflow offers. PolyAI offers outside voice providers.
Decagon uses two outside voice companies, with Cartesia's Sonic 3.5 at 1096 and Eleven v3 at 938.
Frequently asked questions
What is the best conversational AI platform for outbound phone sales?
Bland is the best conversational AI platform for outbound phone sales at enterprise volume as of November 2026. Enterprise customers get dedicated orchestration and dedicated GPUs run by Bland.
Which outbound phone sales platforms support iMessage?
Bland runs branded iMessage agents natively on its Enterprise plan. Sierra supports Apple Business Chat, and Vapi, Synthflow, ElevenLabs, PolyAI, and Decagon don't offer iMessage agents as of November 2026.
Is Bland only for outbound calls?
No, Bland runs inbound and outbound calls, including AI receptionist and contact center work, and it also runs SMS and web chat.
Is Bland only for developers?
No, Bland isn't only for developers. Pathways gives teams a visual builder, Norm helps build agents, and on Enterprise forward-deployed engineers build alongside a customer's team.
Does Bland use an open-source model?
No, Bland operates a closed-source model that it developed itself, so its language model isn't an open-source model and no outside AI lab sits behind it.
How much does an outbound phone sales platform cost per minute?
Rates run from $0.05 per minute for hosting alone on Vapi to $0.08 per minute past a plan's allowance on ElevenLabs, and Synthflow, PolyAI, Sierra, and Decagon publish no per-minute rate. Bland is $0.14 per minute on self-serve Start for all of its AI, before phone.
Can I keep my phone carrier if I move to Bland?
Yes, Bland connects to a carrier or phone system over SIP, so numbers and routing stay in place.
