Retell AI
Voice AI for phone-call automation
Overview
Retell AI builds voice AI agents that handle inbound and outbound phone calls — low-latency conversation, multi-turn handling, integrations with Twilio and major contact-center platforms. Strong fit for SMB customer-support automation and outbound qualification. Pay-as-you-go pricing per call minute.
Use cases
What you can produce with Retell AI
- Build a voice agent that answers your business phone line, handles multi-turn questions, and books appointments into your calendar.
- Run outbound calling campaigns that qualify leads and log outcomes to your CRM automatically.
- Connect an agent to a real phone number via Twilio or your existing contact-center platform in minutes.
- Design conversation flows with function calling so the agent can look up orders, check availability, or create tickets mid-call.
- Transfer a call to a human agent with context when the AI hits the limits of what it can resolve.
- Test agents against simulated conversations before putting them on live customer calls.
- Review call transcripts, recordings, and analytics to audit agent performance and refine prompts.
ASEAN Perspective
Retell AI in Southeast Asia
ASEAN-region availability and pricing notes coming soon. Drop the editorial team a note via /contact/ if you can supply local context (Singapore/Malaysia/Indonesia/Thailand/Vietnam).
Retell AI is a developer-first platform for building production AI voice agents that handle real phone calls, with low-latency conversation, interruption handling, telephony (Twilio/SIP) integration and post-call analytics. It abstracts the hard real-time audio plumbing so teams can ship inbound/outbound call agents for support, scheduling and qualification fairly quickly.
It suits engineering teams and agencies building voice automation for contact centres and SMBs. Caveats: it requires developer effort and good prompt/flow design, per-minute costs plus underlying LLM/telephony fees stack up, and voice-agent reliability in messy real calls still needs guardrails. API and docs are strong; ASEAN telephony coverage and SEA-language quality vary by region.
What people say
Retell AI, founded in 2023 and Y Combinator-backed, has become one of the most visible platforms for AI phone agents and remains independent. It provides the full stack for voice agents that answer or place real phone calls - low-latency speech, multi-turn conversation handling, Twilio and contact-center integrations - billed per minute of talk time. It won a Best Agentic AI Software award in the 2026 G2 Best Software Awards.
User sentiment is strongly positive: it holds around 4.8/5 on G2 across well over a thousand reviews. The most consistent praise is call quality and latency - reviewers say conversations feel like talking to a human rather than a bot, with natural turn-taking and few awkward pauses. Developers also rate the documentation, API-first design, and the speed with which a working agent can be stood up and connected to a phone number.
The dominant complaint is pricing complexity. The headline $0.07/minute voice-engine rate is only one component; once you add a decent LLM, premium voices, and Twilio telephony, real-world costs typically land around $0.13-$0.31 per minute, and G2 reviewers flag cost concerns in dozens of mentions - the gap between estimated and actual spend stings on high-volume campaigns. Reviewers also note that non-English voice quality (German is cited specifically) is inconsistent, and that Retell is fundamentally a developer toolkit: teams wanting a turnkey, no-code revenue-ops solution find it a less obvious fit.
Retell suits developers and technically-staffed SMBs automating inbound support lines, appointment booking, and outbound lead qualification, especially those who want low-level control over the agent's logic. Buyers should model all-in per-minute economics honestly before committing, and multilingual deployments deserve a careful pilot first.
Summary of public user & expert reviews, compiled by RECATOOLS.
About this listing
This entry was compiled from publicly available data including Retell AI's official website, press releases, documentation, and reputable third-party publications. RECATOOLS is not affiliated with Retell AI unless explicitly stated.
Third-party AI tools update their pricing, features, availability, and policies frequently. Information here may be outdated by the time you read this — we make reasonable efforts to keep listings current, but cannot guarantee absolute accuracy.
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