Alternatives to Rebuff

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

Synthflow AI runs enterprise voice AI agents on its own telephony network for automated phone calls at scale.

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

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

No-code AI voice agents that run outbound and inbound phone calls, book meetings, and take call-time actions for you.

AI voice admissions rep that calls every career-school inquiry within 60 seconds and books the appointment

AI voice and chat support agents that chase a metric — resolution rate, escalation rate, or CSAT — not just answer calls.

Inworld is a research lab and inference provider for realtime voice AI, offering first-party TTS-2 and STT models plus a zero-markup LLM router for developers

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 into ultra-realistic AI voice, music, dubbing and conversational voice agents from one 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.

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

Enterprise AI concierge platform for customer support agents that work across chat, voice, and email.

Voice AI that answers restaurant phone and drive-thru orders with a customizable, branded persona.

Modular LLM agentic AI platform that automates enterprise contact centers across voice and text in Swiss-German, German, French and Italian.

Emotionally expressive text-to-speech and speech-to-speech voice AI with human-judged evaluation built in.

Build voice and chat agents that hold real conversations in 70+ languages, live in about five minutes.

Agentic AI for property management and healthcare that answers every lead, resident, and patient 24/7 across SMS, email, chat, and voice.

Voctiv is an omnichannel generative AI platform that handles calls, messages, and appointments for enterprises, SMBs, and solo professionals.

Inworld AI is a research lab and inference provider for realtime voice — first-party TTS-2 and STT models plus zero-markup routing across 220+ LLMs.

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

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

Millis AI (by TMate Inc.) builds LLM voice agents you can deploy to phone numbers, web, mobile or desktop with claimed 500–600ms latency.

Smallest.ai is a developer-first voice AI platform with TTS, STT, speech-to-speech models, telephony and hosting on one API-first bill.

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

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

SkipCalls is a 24/7 AI receptionist that answers your existing business line, books jobs, blocks spam, and texts you every call summary for $19.99/mo.

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

One no-code platform for AI chatbot, outbound voice calling, WhatsApp broadcast, and sales analytics agents.

Upfirst is an AI phone receptionist that answers calls 24/7, books appointments into your calendar, and texts you the details.