12 Best Free AI Voice Assistants for Call Centers (2026)

The short answer

Our recommended AI voice tools for call centers with free tiers for 2026 are Amazon Lex, AssemblyAI, Deepgram, Dialogflow CX, ElevenLabs Agents, LiveKit Agents, Pipecat, Rasa, Retell AI, Twilio, Vapi and Voiceflow (listed alphabetically, not ranked). Most offer free credits, free tiers or open-source licences; production call volumes are billed per minute.

At a glance

#	Name	Made by	Best for
1	Amazon Lex	Amazon Web Services	AWS and Amazon Connect users
2	AssemblyAI	AssemblyAI	Call transcription and analytics
3	Deepgram	Deepgram	Speech-to-text and voice agent API
4	Dialogflow CX	Google Cloud	Enterprise contact centers
5	ElevenLabs Agents	ElevenLabs	Realistic voices
6	LiveKit Agents	LiveKit (open source)	Real-time voice infrastructure
7	Pipecat	Daily (open source)	Open-source voice agent framework
8	Rasa	Rasa	On-premise conversational AI
9	Retell AI	Retell AI	Natural-sounding phone agents
10	Twilio	Twilio	Telephony building blocks
11	Vapi	Vapi	Developer-built voice agents
12	Voiceflow	Voiceflow	Designing voice and chat flows

Listed alphabetically, not ranked.

The 12 picks in detail

1Amazon Lex

Amazon Web Services

Voice and chat bots with a free tier for new AWS customers.

Made by: Amazon Web Services
Best for: AWS and Amazon Connect users
Category: AI voice tools for call centers with free tiers

2AssemblyAI

AssemblyAI

Speech-to-text with summaries and sentiment, with free credits.

Made by: AssemblyAI
Best for: Call transcription and analytics
Category: AI voice tools for call centers with free tiers

3Deepgram

Deepgram

Fast transcription and voice agent APIs, with free credits.

Made by: Deepgram
Best for: Speech-to-text and voice agent API
Category: AI voice tools for call centers with free tiers

4Dialogflow CX

Google Cloud

Google’s conversational AI for virtual agents, with free trial credits.

Made by: Google Cloud
Best for: Enterprise contact centers
Category: AI voice tools for call centers with free tiers

5ElevenLabs Agents

ElevenLabs

Conversational voice agents with ElevenLabs voices; free tier minutes.

Made by: ElevenLabs
Best for: Realistic voices
Category: AI voice tools for call centers with free tiers

6LiveKit Agents

LiveKit (open source)

Open-source framework for real-time voice and video AI agents.

Made by: LiveKit (open source)
Best for: Real-time voice infrastructure
Category: AI voice tools for call centers with free tiers

7Pipecat

Daily (open source)

Python framework for real-time voice AI agents.

Made by: Daily (open source)
Best for: Open-source voice agent framework
Category: AI voice tools for call centers with free tiers

8Rasa

Rasa

Conversational AI with an open-source core you can host yourself.

Made by: Rasa
Best for: On-premise conversational AI
Category: AI voice tools for call centers with free tiers

9Retell AI

Retell AI

Voice agents for inbound and outbound calls with free trial credits.

Made by: Retell AI
Best for: Natural-sounding phone agents
Category: AI voice tools for call centers with free tiers

10Twilio

Twilio

Phone numbers, calls and voice AI integrations; pay-as-you-go with trial credit.

Made by: Twilio
Best for: Telephony building blocks
Category: AI voice tools for call centers with free tiers

11Vapi

Vapi

Platform to build phone voice agents with your choice of models; free starting credits.

Made by: Vapi
Best for: Developer-built voice agents
Category: AI voice tools for call centers with free tiers

12Voiceflow

Voiceflow

Visual design of AI agents for phone and chat; free starter plan.

Made by: Voiceflow
Best for: Designing voice and chat flows
Category: AI voice tools for call centers with free tiers

Free plans, prices and features change often. Check each provider’s website for current terms before you sign up.

What to know before you choose

Compliance

Follow call recording consent laws and disclose AI to callers.

Escalation

Always provide a route to a human agent.

Latency

Test response speed; delays feel unnatural on calls.

Cost

Per-minute pricing adds up; model it before scaling.

How to choose

Test two or three tools on a real task before you commit.
Read the free plan limits: usage caps, features, file sizes and commercial use.
Check privacy: whether your data is used for training and where it is stored.
Make sure you can export your work if you switch tools.
For business use, check admin controls, security and compliance on paid plans.

Red flags

Free plans that require a card and auto-renew.
Vague privacy policies on how your data is used.
No way to export your data.
Claims of perfect accuracy.
Unknown developers with no company details.

How we chose

These are iCreativez Technologies’ own recommendations, based on research and experience of the market. We looked at a usable free plan or free tier, quality of results, privacy and reputation of the developer. The list is listed alphabetically, not ranked. Details such as services, prices, plans and locations change, so confirm them directly before you decide. No one paid to appear.

Frequently asked questions

What are the best AI voice tools for call centers with free tiers?

Are these AI tools really free?

Each has a free plan or free tier at the time of writing, but limits apply, such as monthly usage caps, fewer features or watermarks. Free plans change often, so check the current terms on each tool’s website.

Is it safe to put business data into free AI tools?

Be careful. Some free plans may use your inputs to improve their models. Avoid entering confidential, personal or client data unless the provider’s terms and settings allow you to opt out, or use a business plan with data protection commitments.

How did you choose this list?

These are iCreativez Technologies’ own recommendations, based on research and experience of the market. The list is listed alphabetically, not ranked, and nobody paid to appear. iCreativez publishes this page and is not part of the list.