AI-powered voice assistants and phone agents for customer service and sales.
7 Tools Reviewed
Expert Curated
Regularly Updated
#1 Best Overall
ElevenLabs
AI voice generator, voice agents, and audio creation platform
Free / $5/mo
Free Tier
ElevenLabs provides AI-powered audio generation covering text-to-speech, voice cloning, music composition, sound effects, and conversational voice agents. It serves content creators producing audiobooks, podcasts, and videos, as well as enterprises deploying customer-facing voice agents with telephony and CRM integration. The platform supports 70+ languages and offers both a web interface and developer APIs with Python and TypeScript SDKs.
Pros
Supports 70+ languages with highly expressive, natural-sounding speech synthesis
Comprehensive platform combining TTS, voice cloning, music, SFX, and voice agents in one place
Extensive integration ecosystem for agents including Twilio, Salesforce, Zendesk, and major telephony providers
Cons
Pricing can scale quickly for high-volume usage with per-character or per-minute costs
Voice cloning raises ethical concerns and requires trust in ElevenLabs' safety measures
Free tier is quite limited in credits, making it mainly useful for evaluation
Best for:Content creators and enterprises needing lifelike AI speech and voice agents
AI agents for customer and employee experience automation at enterprise scale
Freemium
Free Tier
Yellow.ai is an enterprise agentic AI platform that automates customer service and employee support through AI agents capable of handling voice, chat, email, and SMS conversations. It uses a multi-LLM architecture (15+ models) and offers 150+ pre-built integrations with enterprise systems like Salesforce, Zendesk, and ServiceNow. The platform is primarily used by large enterprises (1,300+ global brands) seeking to reduce customer service costs while maintaining high-quality, human-like interactions at scale.
Pros
Multi-LLM architecture avoids vendor lock-in and lets you choose the best model per task
150+ pre-built integrations enable fast deployment without replacing existing tech stacks
Supports voice, chat, email, and SMS in a single platform with omnichannel context retention
Cons
Enterprise pricing is opaque and requires contacting sales, making cost planning difficult
Free tier is heavily limited with only 1 AI agent and restricted features across all capabilities
Primarily designed for large enterprises — likely overkill and cost-prohibitive for SMBs
Best for:Large enterprises automating customer service across voice, chat, and email channels
Build trustworthy AI agents for real-world enterprise use
Freemium
Free Tier
Rasa is an enterprise-grade conversational AI platform that enables organizations to build AI agents for customer support, sales, and internal operations across text and voice channels. It uses a proprietary CALM architecture that combines LLMs with deterministic business logic, giving teams full control over agent behavior without relying on black-box AI. The platform offers both no-code (Studio) and pro-code development interfaces with on-premise or cloud deployment options.
Pros
CALM architecture separates language understanding from business logic, reducing hallucinations and unpredictable behavior
Flexible deployment options including on-premise, self-hosted, and partner-managed for regulated industries
Dual build modes: no-code Studio for business teams and pro-code interface for developers
Cons
Enterprise pricing is opaque — requires contacting sales for any paid tier details
Complex platform with steep learning curve requiring conversational AI and potentially ML knowledge
Free Developer Edition has unclear feature limitations and requires a license key request
Best for:Enterprise teams building production-grade conversational AI agents at scale
Build, launch, and scale AI agents for customer experience without code
Freemium
Free Tier
Voiceflow is a no-code platform for building and deploying AI-powered chat and voice agents, primarily targeting customer support and lead generation use cases. It offers a visual workflow builder, 300+ integrations, and an agentic context engine for handling multi-turn conversations. The platform is used by 250,000+ users and serves enterprises like Turo, StubHub, and Trilogy.
Pros
No-code visual workflow builder makes agent creation accessible to non-technical team members
300+ app integrations allow connection to existing tech stacks like Zendesk, Shopify, and HubSpot
Supports both chat and voice channels with low latency (500ms for voice)
Cons
Pricing details for paid tiers are not transparently listed on the website, requiring a demo or sales contact
Advanced customization may require engineering involvement despite the no-code positioning
Platform is heavily focused on customer support — other agent use cases may have less out-of-the-box support
Best for:Teams building production AI support chatbots and voice agents without coding
AI customer service agents that autonomously resolve conversations at scale
Contact Sales
Ada is an enterprise-grade AI customer service platform that deploys autonomous AI agents to resolve customer conversations across voice, email, chat, social media, and messaging channels. It uses a unified Reasoning Engine powered by large language models to deliver consistent, multilingual support with built-in safety controls. Ada is designed for mid-to-large enterprises seeking to automate high volumes of customer interactions while maintaining quality and compliance.
Pros
Unified AI agent works consistently across voice, email, chat, SMS, and social channels from one reasoning layer
Deep integration ecosystem with 20+ CRM, helpdesk, and telephony platforms including Zendesk, Salesforce, and Genesys
Enterprise-grade compliance (HIPAA, SOC2, GDPR) with multi-layer safety controls and zero data retention with LLM providers
Cons
No self-serve pricing or free tier—requires sales engagement, making it inaccessible for small businesses or startups
Heavily enterprise-focused platform likely requires significant setup, integration work, and ongoing optimization with Ada's team
Limited transparency on costs means it's difficult to budget without going through the sales process
Best for:Enterprise CX teams automating high-volume, multichannel customer support
Ultra-realistic AI voice generator for text-to-speech, voiceovers, and dubbing
Freemium
Free Tier
Murf AI is a text-to-speech and voice generation platform that converts text into natural-sounding speech across 150+ voices in 35 languages. It offers a studio for voiceover creation, AI dubbing for video localization, and a low-latency TTS API (Falcon) designed for building voice agents at scale. It is used by over 6 million users and 300+ Forbes 2000 companies.
Streamline freight email operations with AI workflow automation
Contact Sales
Levity is a workflow automation platform designed for the freight and logistics industry. It automates email operations, phone calls, and data entry between emails and TMS systems, enabling brokerages and logistics companies to handle more volume without proportionally increasing headcount. The platform combines email analytics, AI-powered workflow builders, and voice AI agents in one solution.
Pros
Purpose-built for freight/logistics with domain-specific workflows like load building and appointment scheduling
Combines email automation, phone AI, and operations analytics in a single platform
Enterprise-grade security with ISO 27001, SOC 2, and GDPR compliance hosted in Europe
Cons
Narrowly focused on freight and logistics; not suitable as a general-purpose automation tool
No self-serve pricing or free trial — requires demo and sales engagement
Limited public information on specific TMS and tool integrations supported
Best for:Freight brokerages and logistics teams automating email and phone workflows
