Alternatives to Calltree

PolyAI builds enterprise voice AI agents that handle complex customer calls in 40+ languages

Decagon is an enterprise AI concierge platform for omnichannel customer support across chat, voice, and email.

Enterprise Voice AI platform with in-house telephony and the BELL deployment framework for automating phone calls at scale.

AI phone answering built only for restaurants — it takes inbound calls, answers guest questions, and books reservations 24/7.

SkipCalls is a 24/7 AI receptionist that answers your existing phone line, books jobs, and blocks spam for $19.99/mo.

No-code AI voice agents that automate phone calls, book meetings, and handle customer interactions 24/7.

AI agents that answer patient calls, book visits, and recover no-shows across voice, SMS, email, and web.

Inworld is a realtime voice AI platform for developers building full-duplex voice agents with TTS, STT, and zero-markup LLM routing.

Build real-time conversational AI voice and chat agents that listen, understand, and act in 70+ languages.

Enterprise voice AI agents running on Synthflow's own telephony network, from $30,000/year

Open-source, self-hosted voice AI platform with a visual workflow builder, MCP-native design, and bring-your-own-key model support.

Beckon AI admissions rep calls every career school inquiry in under a minute and books the appointment

Bland AI runs enterprise voice AI phone agents for regulated calls, with a per-minute rate that bundles LLM, STT, and TTS.

Agentic AI for property management and healthcare that answers every lead, resident, and patient 24/7.

Vapi is an API-first platform for building voice AI agents that answer and place real phone calls at sub-500ms latency.

Omnichannel generative AI platform for voice and messaging automation

Realtime voice AI platform: top-ranked TTS-2, speech-to-speech, and zero-markup LLM routing for consumer apps.

Resolve is an AI-native CRM built only for debt settlement teams, with six named AI workers automating intake, servicing, and negotiations.

AI-native operating system for Medicare and ACA agencies, staffing sales, retention, and revenue work with AI employees.

Low-latency text-to-speech API and AI voice agents — Murf AI runs real-time phone conversations at 1 cent per minute.

ElevenLabs turns text, audio and images into speech, music, dubbing and conversational agents, all billed from one shared credit pool.

Real-time voice AI platform: Sonic-3.6 text-to-speech and Ink-2 speech-to-text models plus Managed Agents for building production voice agents.

Branded, customizable AI voice ordering for restaurant chains

Build and deploy LLM voice agents with 500-600ms low latency, from no-code to low-code.

Real-time voice AI platform with sub-100ms text-to-speech, 38-language speech-to-text, and native speech-to-speech agents

Open-source voice AI framework for building real-time voice agents you host yourself

AI phone answering for home services that books jobs 24/7, not just takes messages

Real-time AI voice changer, cloning, TTS, and AI voice agents for gaming, content, and enterprise.

API-first platform for real-time AI video agents with expressive avatars, vision, memory, and sub-500ms latency.

Turbo is Bland AI's all-in per-minute voice API covering LLM, STT, and TTS in one rate