Voice AI agents: 2026 solutions compared
Callbots, voicebots, voice AI agents: offers are multiplying. Here is what each vendor offers, who it is for, how it is priced, and the gap none of them covers yet.
A voice AI agent answers the phone instead of, or in support of, your advisers: it understands the request, answers, books an appointment, qualifies, and hands over to a human when needed. Offers have multiplied in two years, from turnkey solutions for very small businesses to platforms for large contact centres.
This comparison is based on each vendor's public information, consulted on 20 October 2026. It helps you make an initial selection according to your size and needs.
Callbot, voicebot, voice AI agent: what do these mean?
All three terms describe a bot that answers the phone. Callbots and voicebots mainly follow predefined scenarios (intelligent voice menus, frequently asked questions). A voice AI agent, supported by recent language models, understands freely worded requests and leads a real conversation. In practice, most vendors now use all three terms.
The solutions at a glance
| Vendor | What the agent does | Who it is for | Public pricing |
|---|---|---|---|
| Aircall (AI Voice Agents) | Answers 24/7, handles FAQs, transfers to a human; several languages, some in beta | Businesses already using Aircall telephony, of all sizes | Usage-based, announced minimum US$100 per month; euro amount not specified |
| Ringover (Airo) | Inbound and outbound calls, qualification, contextual transfers; customisable language and voice | High-volume sales and customer service teams | Per-conversation billing, amount not specified |
| AirAgent | Answers 24/7, books appointments, qualifies, transfers, sends reminders | Very small businesses to large accounts, all sectors | From €89 excl. VAT per month + €0.30 excl. VAT per minute |
| Yelda | Callbot: appointments and reservations, reception and routing, identity verification, FAQs | Local authorities, hospitality, insurance, healthcare, retail, call centres | Not specified; contact sales |
| Volubile | 24/7 reception, appointments with SMS confirmation, tickets, follow-ups; over 50 languages announced | Very small businesses to large groups | From €49 per month, 120 minutes included; enterprise by quotation |
| Zaion | Voice and text AI agents for customer relations: qualification, routing, handover to an adviser | Large customer-service accounts (banking, mutual insurers) | Not specified; contact sales |
| ViaDialog | Callbots and voicebots for contact centres, SaaS, on-premise or hybrid | Contact centres: banking, insurance, healthcare, energy | Bespoke callbot modules; amount not specified |
| Salesforce (Agentforce Voice) | Reads and updates the CRM, qualifies, books appointments, transfers with context; English and French, other languages in beta | Salesforce customers | Credits: US$500 for 100,000 Flex Credits; depending on the offer |
| Vizalia | Voice agent with vision: it sees what the customer shows during the call; or vision added to your existing agent | Customer service, after-sales support, telesales for large accounts | Based on call volume and the option |
Public prices recorded on vendors' websites on 20 October 2026, excluding tax unless stated otherwise. They change frequently: check with each vendor.
How to choose
Your size. For a practice, agency or SME that wants to stop missing calls, monthly subscription offers (AirAgent, Volubile) can be set up quickly. For a contact centre, platforms designed for large accounts (Zaion, ViaDialog), or integrated with your telephony (Aircall, Ringover) and CRM (Salesforce), are often natural choices.
Your tools. An agent that cannot read your CRM or calendar remains an improved telephone switchboard. Check native integrations and the transfer of context to the adviser.
Your languages. If you serve customers abroad, compare languages actually available in production, not just announced.
Your data. Where are conversations hosted? Are they used to train models? What certifications (ISO 27001, HDS for healthcare)? Answers vary considerably between vendors.
Your calls. Appointments, order tracking, FAQs: almost all agents can handle them. But if some of your calls require seeing something, a light, label, document, part, look closely at the next point.
The gap none covers: sight
Among the other vendors studied, the ability for the agent to see what the caller shows during the call is not specified in the sources consulted. This does not prove the capability does not exist: check with each vendor.
In after-sales support, insurance or sales, customers often struggle to describe what is in front of them. An agent that cannot see asks ten questions, or guesses. Why a voice AI agent gets stuck in after-sales support
This is Vizalia's speciality. During the call, the agent sends an SMS link; the customer opens it without an app and films what they want to show; the agent sees, reads a serial number, recognises a product and answers based on what it sees. Two options:
- You do not have a voice agent yet: Vizalia provides the voice agent and visual agent, ready to answer on your overflow and off-peak hours.
- You already have one: if it is built on a platform such as Twilio, Vapi or Retell, or developed in-house, it connects to Vizalia through our MCP server and gains eyes while keeping its voice.
For data: hosting in France or installation on your premises, open-source models, no customer data to train models, ISO 27001 certification. Discover the voice AI agent with vision
Frequently asked questions
What is the best voice AI agent? There is no single best agent for everyone. An SME that wants to stop missing calls does not have the same needs as a contact centre with 300 advisers. Start with your calls: how many, for what reasons, with which tools, and in which languages.
How much does a voice AI agent cost? Public prices range from around €50 per month for a small offer to per-minute or per-conversation billing for large volumes. Enterprise offers are almost always by quotation.
Can a voice AI agent see what the customer shows? This capability is not specified in the sources consulted for the other vendors studied. Vizalia adds it: the agent sends an SMS link, the customer films, the agent sees.
Can we keep our current voice agent and add vision? Yes, if your agent can connect to an MCP server (this is the case for agents built on Twilio, Vapi or Retell, or developed in-house). Let's discuss it in 20 minutes.
