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AI phone assistants and voice agents compared

Voice agents hold conversations with a synthetic voice, for example on the phone for appointment booking or customer service. Listed here are the platforms in our catalog whose vendors describe voice agents or AI phone agents.

The order is alphabetical and not a rating. It is based on our catalog entries and the vendors' official sources.

Tools in this overview

Bland AI

Voice & speech

Programmable AI phone agents for inbound and outbound calls, with per-minute billing and separate telephony costs.

Free accessOne-off free allowance
Paid fromStart · 0 USD + 0.14 USD/minUSD 0 monthly base fee; USD 0.14 per connected call minute
  • Build and Scale raise concurrency and daily caps while lowering minute rates. Limits are not free minutes included in the base fee.
  • 10 concurrent calls; 100 calls per day and 100 per hour

Details Visit site (opens in a new tab)

Cartesia

Voice & speech

Real-time text-to-speech, speech-to-text and managed voice agents through a usage-based API.

Free accessFree plan20000 credits per month, plus 1 USD of agent credit, which covers about 27 minutes with Sonic or about 1 hour 51 minutes with Ink. Concurrency limits are 2 for text-to-speech (TTS) and 8 each for speech-to-text (STT) and agents.
Paid fromPro · 5 USD100000 credits/month, 5 USD agent credit; Sonic ~133 min, Ink ~9h16; TTS 3, STT/agents 12/12 concurrent
  • TTS, STT and managed voice agents with separate consumption types
  • Zero Data Retention only for Enterprise TTS/STT

Details Visit site (opens in a new tab)

Deepgram

Voice & speech

Developer API platform for speech-to-text, text-to-speech, and voice agents, billed on a usage basis.

Free accessFree plan
Paid fromPay As You Go · contact sales$200 free credit, no minimums
  • Real-time transcription (Nova-3) with the lowest latency for live applications
  • Batch transcription for recorded audio and video files

Details Visit site (opens in a new tab)

ElevenLabs

Voice & speech

Generate speech, voiceovers, dubbing, and voice agents with synthetic voices.

Free accessFree plan10,000 credits per month. The pricing table lists about 10 minutes of TTS (text-to-speech) use in the interface.
Paid fromStarter · $6 / $530,000 credits
  • Text-to-speech (TTS) with expressive voices in 70+ languages via web and API
  • Instant Voice Cloning and Professional Voice Cloning from short audio samples

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Retell AI

Customer service & chat

Platform for AI voice agents that handle phone calls (appointment booking, lead qualification, customer service), billed per call minute on a pay-as-you-go basis.

Free accessFree trial
Paid fromPay-as-you-go (voice agents) · 0,07-0.31 $$10 free starter credit on sign-up, full platform access with no commitment
  • AI voice agents handle phone calls for bookings, lead qualification, and customer service
  • Billed per call minute on a pay-as-you-go model

Details Visit site (opens in a new tab)

Smallest.ai

Voice & speech

Voice AI platform offering low-latency (sub-100ms) text-to-speech, speech-to-text, and voice agents for enterprises.

Free accessFree plan
Paid fromEnterprise · contact sales99.99% SLA, on-premise, SSO, SOC2/HIPAA
  • Text-to-speech API with latency below 100 milliseconds for real-time voice applications
  • Speech-to-text transcription for conversations and recordings

Details Visit site (opens in a new tab)

Vapi

Voice & speech

Developer platform for building and deploying voice AI agents (phone call bots) that handle customer calls, support, and appointment scheduling.

Free accessFree plan
Paid fromScale · contact salesVolume-based per-minute pricing, SOC 2, HIPAA, PCI, SSO
  • Pay-as-you-go call minutes from $0.05 per minute
  • 10 concurrent calls included at no extra cost in the Build plan

Details Visit site (opens in a new tab)

Voice.ai

Voice & speech

TTS, voice agents, and audio tools.

Free accessFree plan5,000 credits: 5 TTS minutes or 3 audio-tool uses.
Paid fromStarter · $5 / $4.1715,000 credits/month
  • Text-to-speech and voice agents in a shared credit system
  • Instant voice cloning from the Starter plan

Details Visit site (opens in a new tab)

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This page provides general information and is not legal advice. The vendors' own information and terms apply.