Alternatives to TalkStack AI

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

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

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

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

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

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

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

Dograh is an open-source voice AI platform for building speech-to-speech agents you self-host with BYOK model keys.

Myna builds AI voice and SMS agents that answer calls, qualify leads and book appointments for service businesses.

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

Agentic AI that answers every prospect, resident, and patient message across SMS, email, chat, and voice for housing and healthcare operators.

Voctiv runs AI call and message handlers that answer, qualify, and book for businesses of any size.

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.

SkipCalls is a 24/7 AI receptionist for small businesses that answers your existing line, books jobs into your calendar, and texts you a summary of every call.

Stellar's Beckon AI voice assistant calls every career-school inquiry within 60 seconds and books the appointment.

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

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

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.

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

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

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

AI-native CRM built for debt settlement teams, with six named AI workers automating intake, servicing, and negotiation.

AI receptionist that answers calls in two rings, qualifies the caller, and books the appointment into your calendar and CRM.

Bizzy AI is call infrastructure for banks and fintechs: its Otto agent phones service providers, negotiates with a live rep, and returns a transcript-verified

ElevenLabs generates ultra-realistic AI voice, music, dubbing, and voice agents from one shared credit pool.

Turbo is Bland AI's per-minute voice API that bundles LLM, speech-to-text, and text-to-speech into a single rate.

Voice AI that takes restaurant phone, drive-thru, text and kiosk orders in your brand's voice.

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.

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