What is an AI Voice Agent?
An AI Voice Agent is an intelligent software system that understands spoken language and responds in natural speech to complete tasks over phone lines or other voice channels in real time. AI Voice Agent combines automatic speech recognition (ASR), language understanding via NLP/LLMs, and text-to-speech (TTS) to deliver human-like, multi-turn conversations at scale.
AI Voice Agent can handle routine customer service inquiries at scale, shortening queues and improving first-contact resolution in customer service. It can lower operational costs while increasing efficiency and service coverage windows.AI Voice Agents can assist businesses by efficiently scheduling and rescheduling appointments, while also automating transactional workflows such as bookings, payments, and order placements.
Top 10 Best AI Voice Agents in 2025
- SquadStack / Humanoid AI Voice Agent - Voice sales & revenue-oriented agent. Their AI Voice bot is trained on millions of real calls and supports real-time selling, customer support conversations, and full sales workflow automation.
- Osno.ai is a no-code Voice AI platform for lead qualification, appointment booking, and automated follow-ups with fast, human-like conversations and built-in telephony.
- ElevenLabs: It is known for expressive, high-quality speech synthesis and voice cloning.
- Deepgram: It has strong speech-recognition / transcription capabilities, suitable for real-time voice agent ASR needs.
- Twilio: A telephony and voice API provider that can be used to build voice agents when combined with speech recognition/logic.
- Vapi AI: More modern tools focused on connecting LLMs / voice agents more directly; good for prototyping/devs.
- Bland AI: Hosted voice agent platform optimized for outbound calling logic, simpler flows.
- Bandwidth: Telecom API / voice backbone for voice agent system.
- PolyA: Human-like conversational voice agents.
- Yellow.ai: Multilingual voice + chat automation.
SquadStack / Humanoid AI Voice Agent - Voice Sales & Revenue-oriented Agent
What it does:
An AI-powered voice sales agent built for telecalling, lead qualification, and revenue generation. Trained on millions of real sales calls to handle conversations, nurture leads, and close opportunities.
Who it’s for:
Ideal for sales-driven teams and enterprises in industries like real estate, BFSI, and consumer services that handle large outbound call volumes and need consistent, high-quality customer engagement.
Key Features:
- Human-like voice with contextual awareness
- Multi-language support (135+ languages)
- CRM integration & auto-updates
- Lead qualification & appointment booking
- Intelligent dialogue + error-free data handling
Pros:
- Built for sales & revenue generation
- 24/7 availability with high scalability
- Consistent performance, zero data-entry errors
Pricing: Custom (enterprise-level, based on usage)
Osno.ai - No-code Voice AI Platform for Lead Qualification, Appointment Booking, and Automated Follow-ups.
What it does:
- A no-code voice AI platform that automates lead qualification, appointment booking, and follow-ups with natural, human-like conversations.
- Simplifies sales workflows by handling calls, capturing key details, updating your CRM, and ensuring every lead is followed up on without human effort.
- Acts as your AI sales assistant on the phone, making calls, scheduling meetings, and keeping your pipeline warm at all times.
- Outbound + inbound ready: it can answer customer queries, qualify prospects instantly, and schedule callbacks to keep opportunities moving forward.
Who it's for:
- Designed for SMBs, startups, and agencies looking to scale outreach without increasing headcount.
- Ideal for sales teams that struggle with time-consuming manual qualification and scheduling.
- Perfect for businesses with lean teams who need reliable, 24/7 voice automation for lead management.
- Ideal for growing companies seeking affordable, plug-and-play AI solutions to automate repetitive sales calls and admin tasks.
Key Features:
- No-code flow builder
- Real-time lead qualification
- Appointment scheduling + calendar sync
- Automated follow-ups & reminders
- Built-in telephony and integrations
Pros:
- Easy to set up (no-code)
- Affordable for SMBs
- Purpose-built for sales workflows
Pricing:
- 4 rs/Minute,
- $0.13 per connected minute
- No platform fees
- No lock-ins
ElevenLabs
What it does:
Leading platform for expressive, natural-sounding AI voices and voice cloning.
Who it's for:
Developers, content creators, media, and businesses that need hyper-realistic synthetic voices.
Key Features:
- High-quality TTS & voice cloning
- Multi-language & accents support
- Voice design studio for customization
- Realistic intonation & expressiveness
Pros:
- Industry-best natural voice synthesis
- Wide language and accent support
- Great for media, gaming, and narration
Pricing: Free tier + paid plans from ~$5/month
Deepgram - Real-time Voice Agent for ASR needs.
What it does:
Real-time speech recognition platform (ASR) optimized for powering voice agents.
Who it's for:
Companies building real-time transcription, voice agents, and analytics solutions.
Key Features:
- Low-latency, high-accuracy transcription
- Multilingual ASR
- API-first developer platform
- Works with telephony and streaming
Pros:
- Very accurate real-time ASR
- Strong developer APIs
- Suitable for scaling speech-heavy apps
Pricing: Pay-as-you-go (per audio minute)
Twilio
What it does:
Cloud communications API platform for SMS, voice, and programmable calls.
Who it's for:
Developers & businesses building custom telephony-powered voice agents.
Key Features:
- Programmable Voice APIs
- Call routing & IVR flows
- SIP trunking + telephony infrastructure
- Integrates with AI speech & NLU models
Pros:
- Huge developer ecosystem
- Reliable telephony infrastructure
- Flexible for custom solutions
Pricing: Pay-as-you-go, per call/minute
Vapi AI - Voice Agents for Prototyping/devs.
What it does:
A developer-first platform to prototype and deploy AI voice agents quickly.
Who it's for:
Startups, devs, and teams experimenting with LLM-powered voice agents.
Key Features:
- Voice agent APIs
- Connects with OpenAI/LLMs
- Easy prototyping & rapid testing
- Outbound and inbound calling
Pros:
- Great for prototyping ideas
- Developer-friendly APIs
- Fast to get started
Pricing: Usage-based, developer-friendly pricing
Bland AI - Hosted Voice Agent platform for Outbound calling
What it does:
Hosted voice agent platform focused on outbound calling and voice automation.
Who it's for:
Sales & marketing teams are doing cold calls, surveys, and outreach.
Key Features:
- Outbound call automation
- Custom voice creation
- Call tracking & analytics
- Simple workflows for outreach
Pros:
- Strong outbound call automation
- Easy-to-use dashboard
- Affordable compared to enterprise tools
Pricing: Tiered subscription + per-call pricing
Bandwidth
What it does:
Enterprise telecom & voice infrastructure provider powering AI agents behind the scenes.
Who it's for:
Large enterprises and platforms need a scalable, compliant voice backbone.
Key Features:
- SIP trunking & VoIP APIs
- Telephony infrastructure at scale
- Regulatory compliance (911, STIR/SHAKEN, etc.
- White-label support for AI platforms
Pros:
- Enterprise-grade reliability
- Built-in compliance features
- Strong U.S. coverage
Pricing: Enterprise contracts
PolyAI - Human-like Conversational AI Voice Agents
What it does:
Specializes in human-like conversational AI voice agents for customer service.
Who it's for:
Enterprises handling large-scale inbound support & customer conversations.
Key Features:
- Realistic voice conversations
- Handles complex queries naturally
- Industry-trained voicebots
- Integrates with contact centers
Pros:
- Industry leader in natural inbound conversations
- Proven enterprise deployments
- Works at scale
Pricing: Enterprise-level contracts
Yellow.ai - Multilingual Voice + Chat Automation
Multilingual voice and chat automation platform for customer experience.
Who it's for:
Enterprises needing omnichannel (voice + chat + digital) automation.
Key Features:
- AI-powered voice + chatbots
- 80+ languages
- Pre-built industry solutions
- CRM & ERP integrations
Pros:
- Strong multilingual support
- Omnichannel (voice + chat)
- Scales for enterprise CX
Pricing: Custom enterprise pricing
Comprehensive Comparison of the Top 10 AI Voice Agents in 2025
In 2025, the market will offer a wide range of solutions, from no-code platforms for SMBs to enterprise-grade conversational AI. Each tool differs in strengths such as voice realism, pricing, ease of setup, and scalability.
This comparison highlights the top 10 AI voice agents, outlining their pros, ideal use cases, and cost models. Use this table to identify the right voice agent for your business needs.
How to Choose the Best AI Voice Agent Company for Your Business Needs?
The best AI voice agent company matches specific use cases to measurable outcomes with low-latency, human-like voice performance, and enterprise-grade governance. For sales, onboarding, activation, service, and collections at scale, Osno’s AI–human orchestration, 0.8s median latency, and proven BFSI and non‑BFSI results make it a leading fit for outcome-driven deployments.
What to prioritize
Selecting a vendor should start with the top two or three intents to automate and augment. These may include use cases such as lead qualification, onboarding, activations, collections, renewals, feedback, and cross‑sell, ensuring the platform covers the complete customer stages rather than isolated call flows. Platforms that integrate AI agents, human agents, and workflow orchestration will include communication across omnichannel methods such as voice, WhatsApp, SMS, email, and live transfer, reducing leakage between channels and handoffs.
Technical must‑haves
Natural, interruption-friendly conversations require barge-in, loop-free dialogue, and responsive back-channels. These channels need to be supported by a voice activity detector and micro‑optimizations tuned for telephony noise. Latency should target near‑human turn‑taking, with SquadStack reporting a 0.8s median response time versus typical 1–1.5s industry baselines for smoother exchanges.
Superior Voice Quality
Voice quality and personalization should include 20+ human‑like voices, language switching, background ambience when appropriate, CRM‑aware personalization, and seamless live transfers with preserved context for complex cases.
Data and Model Strength
Companies that have AI voice Agents trained on real telephony deliver better results than those fine‑tuned on generic datasets. Osno.ai has an AI Voice agent trained on 500K hours of proprietary telephonic audio, 400M interactions for model evaluation and selection, and 100K high‑resolution clips powering thousands of natural voices.
Improved Voice Recognition
Training on these large and domain-specific datasets improves voice recognition and generation in high-noise environments. It enables accurate intent capture, outcome tagging, and call summarization under real-world conditions.
Security, Compliance, and Data Residency
Best AI Voice Agent companies use strong safety rules to keep data safe, such as special safety norms like ISO 27001 and SOC 2 Type II. Security experts regularly test the computer system to find and fix weak spots early, which is called VAPT testing.
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