Best AI voice agents for business: 8 platforms ranked on published evidence (October 2026)

AI voice agents in our directory

Voice agents are a niche inside our support category. Our directory lists 30 entries in the voice agents niche, from finished agent platforms to speech infrastructure, quality tools and research projects, next to 61 tools in the whole support category. Only a minority are finished platforms that answer a business phone line, and those are the eight below.

The group is mostly American: 22 of the niche entries are headquartered in the United States, and Germany, the United Kingdom and France follow with a handful each. Security reports are common, 23 name SOC 2 and 14 name ISO 27001, while 19 list pricing on request. For the broader picture of what support agents resolve and how they are priced, see our analysis of AI customer service agents.

Sources: [1]

All eight platforms compared: telephony, languages, pricing and compliance

The table puts the eight platforms side by side in ranking order, and the filter below it narrows the list to what your phone setup needs. Languages are the vendors' own claims, and we could not check how natural the speech is in each one.

The pricing column carries the main finding. PolyAI names its unit, a minute, Parloa names a consumption model, and Fin, Yellow.ai, Decagon and Sierra name per-outcome, per-resolution or per-conversation models, but no vendor lists an amount for a phone call. Cognigy and Ada publish no pricing model at all on the pages we checked.

Sources: [2][3][4][5][6][7][8][9][10][11][12][13][14]

How we ranked the voice agent platforms

Each platform gets 0 to 2 points on four criteria. Voice fit: 2 points if voice is a core product with its own name or engine, 1 point if voice is one channel of a broader support agent. Telephony named: 2 points if the vendor names at least five contact center or telephony platforms, 1 point if it names only SIP or PSTN deployment, 0 if it names neither.

Price transparency: 1 point if the vendor publishes a pricing unit or model such as per minute, per outcome or per conversation, 0 if it publishes nothing, and 2 points are reserved for a published amount for voice, which nobody earned. Compliance named: 2 points for at least three named certificates or frameworks on the vendor's pages, 1 point for one or two, 0 for none.

Ties are broken by voice fit, then by the number of telephony platforms named, then alphabetically. That puts PolyAI ahead of Parloa, both at 7 points. No vendor paid for a position, and no link on this page is an affiliate link. We left out language counts as a criterion because seven of the eight state one and none can be checked from outside.

Sources: [1]

1. PolyAI: voice first, nine named integrations, pricing per minute

PolyAI builds voice agents for enterprise customer service. Its site lists account management, authentication, call routing, billing and payments, booking and reservations, order management, troubleshooting and FAQ as typical call types.

PolyAI says ongoing use is priced per minute, including performance improvements, maintenance and 24/7 support, and lists a 99.9% uptime SLA; amounts come only by quote. Its documentation names nine voice integrations: Five9, NICE CXone, Twilio, Amazon Connect, Genesys, Dialpad, Zoom, custom SIP and DNI pooling. The site names SOC 2, HIPAA, GDPR and PCI DSS as standard.

The limits: the pages we checked state no language count and no data hosting region, so both are demo questions. The price per minute is not published.

Sources: [2][15][3]

2. Parloa: the broadest language claim among the voice-first platforms, and EU roots

Parloa is a Berlin company whose platform lets contact centers design, test and run AI agents for phone, chat and messaging. Its FAQ says the agents speak more than 130 languages including regional dialects, and the company serves customers in more than 70 countries.

Parloa connects to contact center platforms including Avaya, Five9, Genesys, NICE, Twilio and Verint, and to Salesforce, Microsoft Dynamics, ServiceNow, Zendesk and SAP. It names ISO 27001:2022, SOC 2 Type 1 and 2, PCI DSS, HIPAA and DORA, and its homepage shows an EU AI Act badge under the line "Born in the EU". Pricing is consumption based and tied to task complexity and effort, with no amounts published.

The limits: the pages we checked do not name hosting regions, and a consumption model without a unit makes budgeting a question for the proposal.

Sources: [16][4]

3. Yellow.ai: Nexus Vox claims 500 languages and a free plan for chat

Yellow.ai announced Nexus Vox on May 5, 2026 as a voice engine built as one integrated system, with claims of more than 500 languages and dialects, response latency under 400 milliseconds, and deployment across telephony (SIP and PSTN), web widgets and REST APIs. It says voice cloning needs 10 seconds of audio and that Nexus Vox is available to enterprise customers.

Yellow.ai is the only platform here with a free plan, but the plan covers one AI agent and 500 chat sessions a month, then $0.99 per resolution; the Enterprise plan lists VoiceX and is on request. The security page names SOC 2 Type II, ISO 27001, ISO 27701, PCI DSS v4.0.1 and HIPAA.

The limits: the language and latency figures are the vendor's launch claims, and the pricing page calls the voice product VoiceX while the launch calls it Nexus Vox, so ask which product your quote covers. No voice price is published.

Sources: [6][5][17][18]

4. Fin: seven named phone systems, but voice only on custom terms

Fin is the AI customer agent formerly sold as Intercom. Salesforce announced on September 10, 2026 that it completed the acquisition, and Fin operates inside Salesforce AI Labs and keeps serving existing customers. Fin Voice handles identity verification, refunds, appointments and bookings, supports 30 languages and offers live transfer, callback scheduling and custom escalation rules.

Fin works with Twilio, Genesys, RingCentral, Five9, 8x8, Aircall and Mitel through call forwarding or deeper SIP integration. Chat and email are priced from $0.99 per outcome with a 50 outcomes a month minimum on other helpdesks, and a 14-day trial; Fin Voice is on a custom plan for select customers who work with sales. Fin names SOC 2 Type II, ISO 27001, ISO 27701, ISO 42001, AIUC-1 and HIPAA, and offers hosting in the US, the EU or Australia.

The limits: voice is not self-serve and has no published price, and the owner changed three weeks before this check, so roadmap and terms may move.

Sources: [8][7][19][20]

5. NiCE Cognigy: eight CCaaS systems and outbound calling, no price

Cognigy is a Düsseldorf company that NiCE acquired on September 8, 2025 and that now sits next to NiCE's CXone Mpower platform. Its Voice Gateway handles inbound and outbound calls with answering machine detection and routes calls using SIP headers and metadata.

Cognigy lists Amazon Connect, Genesys, Avaya, NiCE CXone, 8x8, Five9, Twilio and RingCentral, lets you choose your own speech-to-text and text-to-speech services, and claims more than 100 languages through built-in machine translation and more than 1,000 synthetic voices. It says the platform supports more than 25,000 concurrent conversations. The only compliance statement on the page is GDPR-compliant voice infrastructure.

The limits: no pricing model, no certificates named on the voice page, and language coverage that relies on translation, which differs from native speech recognition in each language.

Sources: [9][21]

6. Ada: 42 listed languages and six named telephony platforms

Ada is a Canadian customer service platform whose voice agents handle account inquiries, balance checks, appointment scheduling, order status, payments and policy lookups. Its page describes barge-in, background noise suppression and multi-step calls that combine authentication, account lookup and a transaction.

Ada is the one platform that lists its voice languages in full: 42, from Albanian to Vietnamese. It names Twilio, Genesys, NICE CXone, Avaya, Amazon Connect and Aircall, plus Zendesk and Salesforce. Its trust center names SOC 2, SOC 3, HIPAA, GDPR, CCPA, CPRA, PIPEDA and PCI compliance.

The limits: Ada publishes no pricing, and the trust center we read names a SOC 2 reporting period ending in September 2024, so ask for the current report.

Sources: [10][22]

7. Decagon: 70 languages and outbound calls, but no telephony list

Decagon builds support agents for chat, email, voice and SMS. Its voice page claims more than 70 languages with automatic detection and switching, hundreds of voices, handling of interruptions and background noise, transfer to a human with a short summary, and outbound calling for sales, support and customer updates.

Decagon sells per conversation at a fixed rate or per resolution at a higher rate with no charge for escalations; most customers choose per conversation, according to its own pricing article, and no amounts are published. Its security page lists HIPAA, SOC 2, ISO, PCI, CCPA, GDPR and EU AI Act requirements, and it offers zero data retention with its language model providers.

The limits: the voice page names no telephony platforms, and the security page does not say which ISO standard it means.

Sources: [11][12][23]

8. Sierra: payments by phone, 55 languages, outcome pricing

Sierra's voice agent handles interruptions, background noise and accents, detects sentiment, and offers more than 55 languages with switching in mid-conversation. It can collect card and ACH payments over the phone without an IVR handoff.

Sierra prices by outcome: resolved conversations, saved cancellations, upsells and cross-sells, with criteria agreed upfront and, in most cases, no charge for an unresolved conversation. No amounts are published. Its trust page names SOC 2, HIPAA, GDPR, PCI DSS Level 1 Service Provider, FedRAMP High, CCPA, CSA STAR, ISO 27001 and ISO 42001.

The limits: the voice page names no telephony platform, and outcome pricing means you must agree what counts as an outcome before you can compare it with a per-minute price.

Sources: [13][14][24]

Rules to check before an AI answers your phone line

Two rules matter for most buyers. In the EU, Article 50(1) of the AI Act requires systems that talk to people to tell them they are dealing with an AI system unless that is obvious from the context; it applies from August 2, 2026. A greeting that names the AI is the simple way to meet it.

In the United States, the FCC ruled on February 8, 2024 that AI-generated voices are artificial voices under the Telephone Consumer Protection Act, so robocalls that use them need the called party's prior express consent. That matters most for outbound campaigns, which Cognigy and Decagon describe. If the vendor processes call data for you, GDPR Article 28 also requires a processor agreement.

Sources: [25][26][27][28][21][6][20]

Which voice agent fits which situation

Start with the phone system you already run. If it is Genesys, Five9, NICE CXone, Avaya or Amazon Connect, PolyAI, Parloa, Cognigy, Fin and Ada name it, which shortens the integration questions. If you need a language outside the common ones, Parloa, Cognigy and Yellow.ai claim the most, though only a pilot in that language shows how good the speech is.

Then ask each shortlisted vendor for a per-call or per-minute price for your volume in writing. Because no vendor publishes it, the answer decides the shortlist as much as any feature.

Sources: [3][4][9][10][8][11][13][6][25][26]

Tools we checked and left out

Cresta and Forethought have full profiles in our directory and offer voice. Cresta's AI Agent automates voice conversations with transfer to humans, but the pages we checked name no languages, no telephony platforms and no prices. Forethought lists a Voice channel in Solve and claims more than 100 languages, but names no telephony platform and no price.

The niche also contains speech-to-text and text-to-speech infrastructure, conversation quality tools and research projects. These are building blocks or analytics, not finished agents that answer a business phone line, so we did not rank them. We will add Cresta or Forethought once their pages state enough to score.

Sources: [29][30][31]