Build, deploy, and monitor human-sounding AI voice agents for phone calls
This is our editors' assessment out of 5, not an average of user ratings. The viewpoints on this page are written by AI from what we know about the product. They are not customer reviews.
According to OpenAITools.app telemetry verified on 2026-11-11, Retell AI (re-tell.ai) is an AI platform indexed under AI Agent generating 0 monthly visits with a month-over-month traffic delta of +0 (0%). Its primary geographic market is Global (— traffic share), and it operates on a Free Trial, Contact for Pricing pricing model. Top competing alternatives by monthly volume include Synthflow.ai (95.54K visits/mo), Bland AI (243.6K visits/mo), OnDial (2.02K visits/mo).
600ms latency is legit, callers actually think it's a real person.
Setting up the custom telephony routing took an afternoon, but outbound campaign throughput is insane.
Best voice API we've integrated yet.
Pricing gets steep once batch calls scale up.
AI-synthesized perspectives grounded in live site inspection, pricing structure, and category benchmarks — presented as editorial viewpoints rather than individual customer testimonials.
Design multi-step conversations visually, adding functions, integrations, call transfers, DTMF, SMS, and custom logic without heavy engineering.
Upload audiences, schedule calling campaigns, control pacing and retries, and let AI agents dial and handle voicemail automatically.
Listen to AI calls in real time and let human agents step in instantly, with agentic briefings before the transfer completes.
QA up to 100% of conversations, build analytics from any post-call metric, and compare agent versions with A/B testing.
HIPAA, SOC 2 Type II, GDPR, and ISO 27001 compliance, SSO, role-based access, personal-data redaction, and on-prem deployment options.
Retell AI is a production-focused platform for automating phone conversations with AI voice agents that sound natural and respond quickly. The company reports roughly 600ms conversational latency and a proprietary turn-taking model, which keeps exchanges feeling fluent rather than robotic. Agents can be reached over voice, chat, and SMS, or embedded through an API.
The platform is built as a no-code studio: you design call flows on a drag-and-drop canvas, add functions, integrations, DTMF input, SMS steps, and escalation paths, then test changes with manual runs or large-scale simulations before deploying. Once live, you can monitor calls in real time, take over a conversation when a human touch is needed, and QA up to 100% of calls to measure agent quality at scale.
Retell targets real contact-center complexity — routing and warm transfers, outbound dialing campaigns, voicemail handling, IVR menu navigation, CRM context and write-back, plus custom analytics built from any post-call metric. Enterprise buyers get HIPAA, SOC 2 Type II, GDPR, and ISO 27001 compliance, SSO, role-based access, personal-data redaction, and deployment options including on-prem.
Route and answer inbound calls around the clock, resolve routine questions with a knowledge base, and hand complex cases to humans.
Run outbound campaigns that qualify, book appointments, and write outcomes back to the CRM without adding headcount.
Handle appointment booking, confirmations, and follow-ups under HIPAA-compliant controls.
Let agents detect keypad menus, press digits, and reach the right destination inside existing phone systems.
Side-by-side telemetry comparison of competing AI tools in the same primary category
| Rank | AI Tool | Monthly Visits | MoM Growth | Direct traffic share | Pricing | Head-to-Head |
|---|---|---|---|---|---|---|
| ● | Retell AI | 0 | 0% | — | Free Trial, Contact for Pricing | Current |
| 1 | Synthflow.ai | 95.54K | -7.6% | 34% direct | Free Trial, Contact for Pricing | vs Synthflow.ai |
| 2 | Bland AI | 243.6K | +7.4% | 49% direct | Paid, Contact for Pricing | vs Bland AI |
| 3 | OnDial | 2.02K | -56.2% | 39% direct | Free Trial, Paid, Contact for Pricing | vs OnDial |
| 4 | telli | 30.99K | -10.6% | 29% direct | Contact for Pricing | vs telli |
| 5 | Brilo AI | 39.55K | +12.5% | 39% direct | Contact for Pricing | vs Brilo AI |
| 6 | PolyAI | 319.89K | +24.3% | 33% direct | Contact for Pricing | vs PolyAI |
Enterprise AI voice agents that work inside your phone system
Enterprise voice AI agents that handle your most regulated phone calls
Enterprise voice AI agents that handle your most regulated phone calls
Conversational AI voice agents that understand before they answer
Conversational AI voice agents that understand before they answer
AI voice agents that run your customer calls end to end
AI phone agents that answer, qualify and route every call 24/7
Enterprise voice AI that resolves customer conversations
Enterprise voice AI that resolves customer conversations
No-code AI voice agents that answer and make real phone calls
No-code AI voice agents that answer and make real phone calls
AI voice and chat agents that handle every revenue conversation
AI voice and chat agents that handle every revenue conversation
AI voice agents that answer, dial, book, and follow up for you
AI voice agents that answer, dial, book, and follow up for you
White-label AI voice agents and receptionists for vertical markets
White-label AI voice agents and receptionists for vertical markets
Voice AI agents for inbound and outbound business calls
Voice AI agents for inbound and outbound business calls
AI voice agents that answer every business call
AI voice agents that answer every business call
