20+ Best Alternatives to Retell AI in 2026
Hire your AI call center for sales, support, and appointment scheduling
Looking for an alternative to Retell AI? Below are 20 AI startups working in the same space — ranked by our Neuron score so the most credible options come first. Each card shows what makes the tool a viable substitute, pricing signals, and funding stage.
- 1View alternative →
PolyAI
$120MThe world's most lifelike voice AI agents for enterprise customer service.
Why it's similar: Shares categories with Retell AI — AI Agents, AI Voice & Speech.
💵 Enterprise · Contact sales
- 2View alternative →
Gnani.ai
UndisclosedAutomate voice, SMS, WhatsApp, chat and email with AI agents that understand intent, trigger workflows, and close the loop.
Why it's similar: Shares categories with Retell AI — AI Agents, AI Voice & Speech.
💵 Enterprise · Contact sales
- 3View alternative →
Sierra
$2.2BConversational AI agents for every business
Why it's similar: Shares categories with Retell AI — AI Agents, AI Customer Support.
💵 Enterprise · Contact sales
- 4View alternative →
Uniphore
$870MEnterprise business AI for conversations, agents, and data
Why it's similar: Shares categories with Retell AI — AI Agents, AI Customer Support.
💵 Custom
- 5View alternative →
Quo
$161MAI-driven business phone and front office for growing teams
Why it's similar: Shares categories with Retell AI — AI Voice & Speech, AI Customer Support.
💵 Free trial · From $15/mo
- 6View alternative →
Parloa
$562MAn AI Agent Management Platform that transforms customer conversations into lasting loyalty for contact centers.
Why it's similar: Shares categories with Retell AI — AI Agents, AI Customer Support.
💵 Enterprise · Contact sales
- 7View alternative →
Crescendo
$50MAI-native contact center blending agents and humans
Why it's similar: Shares categories with Retell AI — AI Agents, AI Customer Support.
💵 Usage
- 8View alternative →
Ada
$190.9MAI customer service automation platform
Why it's similar: Shares categories with Retell AI — AI Agents, AI Customer Support.
💵 Enterprise · From $30000/mo
- 9View alternative →
Avoca AI
$125MThe AI Front Office for Home Services, providing always-on agents to answer calls, fill schedules, and streamline operations.
Why it's similar: Shares categories with Retell AI — AI Agents, AI Customer Support.
💵 Enterprise · Contact sales
- 10View alternative →
Netomi
$110MThe only agentic AI platform built for what comes after the pilot, designed for enterprises that can't afford to get it wrong.
Why it's similar: Shares categories with Retell AI — AI Agents, AI Customer Support.
💵 Enterprise · Contact sales
- 11View alternative →
Yellow.ai
$102.2MTransform CX & EX with Yellow.ai’s Agentic AI platform to autonomously drive human-like conversations at scale.
Why it's similar: Shares categories with Retell AI — AI Agents, AI Customer Support.
💵 Enterprise · Contact sales
- 12View alternative →
Level3AI
$13MEnterprise AI agents that automate customer engagement across APAC
Why it's similar: Shares categories with Retell AI — AI Agents, AI Customer Support.
💵 Enterprise · Contact sales
- 13View alternative →
Numa
$48MAI agents that answer every call and fill the service bay for dealerships
Why it's similar: Shares categories with Retell AI — AI Voice & Speech, AI Customer Support.
💵 Free
- 14View alternative →
11x
$74MDigital workers that don't just automate tasks – they transform your business with human-like intelligence.
Why it's similar: Shares categories with Retell AI — AI Agents, AI Customer Support.
💵 Enterprise · Contact sales
- 15View alternative →
Relevance AI
$37MAI Agents for Sales & GTM Teams to scale results without scaling headcount.
Why it's similar: Shares categories with Retell AI — AI Agents, AI Customer Support.
💵 Enterprise · Contact sales
- 16View alternative →
Voiceflow
$35MBuild, launch, and scale advanced AI agents for support, lead generation, and beyond without code.
Why it's similar: Shares categories with Retell AI — AI Agents, AI Customer Support.
💵 Free
- 17View alternative →
Synthflow AI
$27MNo-code platform for building human-sounding AI voice agents
Why it's similar: Shares categories with Retell AI — AI Voice & Speech, AI Customer Support.
💵 Free trial
- 18View alternative →
Gradient Labs
$13MProcedural AI agents that deliver specialist customer support for regulated industries.
Why it's similar: Shares categories with Retell AI — AI Agents, AI Customer Support.
💵 Pricing not listed
- 19View alternative →
Bolna
$6.3MVoice AI orchestration for Indian-language calling agents
Why it's similar: Shares categories with Retell AI — AI Agents, AI Voice & Speech.
💵 Free
- 20View alternative →
Giga
$61MEnterprise voice AI agents that handle customer support like humans
Why it's similar: Shares categories with Retell AI — AI Voice & Speech, AI Customer Support.
💵 Free
Frequently asked questions
What are the best alternatives to Retell AI?
The top-ranked alternatives to Retell AI on NeuronFeed are PolyAI, Gnani.ai, Sierra, Uniphore, Quo. Rankings are based on our Neuron score, which weighs funding, momentum and editorial signal.
Is there a free alternative to Retell AI?
Yes — Numa, Relevance AI, Voiceflow offer a free plans. See the pricing column for each alternative above.
How is this list ranked?
We rank alternatives by shared categories with Retell AI, then by our proprietary Neuron score (0–100) which combines funding, team quality, momentum, and editorial input. The list refreshes every 30 days.
Retell AI vs PolyAI — which is better?
It depends on use case. PolyAI (The world's most lifelike voice AI agents for enterprise customer service.) is the #1-ranked alternative. See the full side-by-side at /compare/retell-ai-vs-polyai.
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