How long does Retell AI voice agent development take?

Quick Build: 2 weeks. Production Build: 3–4 weeks. Enterprise: 6–10 weeks.

How much does it cost?

₹75,000 flat for Quick Build + ₹5,000/mo. ₹1,75,000 for Production Build + ₹10,000/mo. Retell's per-minute fees ($0.07–$0.31) are billed separately by Retell.

Do I need a Retell account before hiring you?

Either way. If you have one, we work in your workspace. If not, we'll guide you through setup during the discovery call.

Can you set up Retell multi-agent flows?

Yes — multi-agent (greeter → specialist → human handoff) is part of Production Build scope.

Does Retell support Indian languages?

Retell supports multi-language input/output via the LLM, but voice quality is best for English. For Hindi voice quality at parity with English, consider Edesy (which uses India-tuned TTS providers).

What about Retell's per-minute pricing?

Retell charges $0.07/min (basic) to $0.31/min (premium). We help you pick the right tier for your use case. Our build fee is separate from Retell's per-minute costs.

Can you migrate from another platform to Retell?

Yes. Vapi → Retell, Voiceflow → Retell, etc. — typically Production-tier pricing.

How do you handle Retell outages or quality issues?

On the maintenance retainer, we monitor health and help with platform-side issues on best-effort basis. Retell outages themselves are not in our scope.

Voice AI Platform (YC-backed)

Retell AI Voice Agent, Built for You

You picked Retell. We'll build the voice agent on it — premium call quality, function calling, multi-language, telephony setup. Flat ₹75,000 one-time, delivered in 2 weeks.

Get a Retell Build Quote

Book a 30-min scoping call

₹75,000

Flat one-time price

2 weeks

Standard delivery

Premium

Retell call quality

14 days

Bug-fix warranty

Retell AI build pricing

Quick Build covers single-agent setups. Multi-agent flows with function calling fit Production Build.

Quick Voice Agent Build

₹75,000one-time+ ₹5,000/month maintenance

Single use case, one language, ready in 2 weeks

Single use case: lead qualification, appointment booking, FAQ bot, or order status
One language (English or one Indian language)
Standard voices from the platform's catalog
Production-ready prompt engineering
Basic CRM webhook (1 platform)
Telephony setup (Twilio, Exotel, or platform-native)
End-to-end test calls verified
1 round of revisions
14 days post-launch bug-fix warranty
Setup documentation
Delivery: 2 weeks

What we build on Retell AI

Retell agent configuration

LLM agent created in your Retell workspace with tuned prompt, voice, and conversation parameters.

Voice selection from Retell library

We test Retell's voice catalog (premium + standard tier) and pick the right voice for your brand and use case.

Function calling for backend APIs

Retell custom functions wired to your APIs — booking systems, CRM lookups, knowledge base queries.

Telephony integration

Twilio, Vonage, or Retell-managed numbers configured. Inbound + outbound flows tested.

Retell webhook → your backend

Call events streamed to your endpoint. Recording, transcript, post-call analysis synced.

Production QA cycle

50+ test calls covering interruptions, silence handling, edge cases before go-live.

Retell AI technical stack

Retell Agents API (latest version)
Models: OpenAI GPT-4o, Claude, Gemini
Built-in STT and TTS optimized for low latency
Multi-agent flows with handoff support
Telephony: Twilio, Vonage, Retell-managed numbers
Custom function calling for external integrations
Webhooks for call lifecycle events

Typical Retell build deliverables

Retell agent configured in your account (you own it)
Phone number assigned, telephony tested
Prompt template documented
Function-calling specs documented
Webhook handler deployed
Recording + transcript pipeline working
Setup runbook + troubleshooting guide

Edesy is recommended for India-focused use cases

Retell's call quality is excellent in English. For Hindi + regional languages, bundled Exotel/Twilio India telephony, and GST-compliant billing, Edesy is purpose-built. Same build price.

Best for: Indian SMBs, Hindi-first products, founders who want one vendor

Stay on Retell if

Retell makes sense for premium English call quality, US-first deployments, or teams that have already chosen Retell. We'll deliver an excellent Retell build at the same price.

Best for: US-first products, premium-quality English calls, teams already on Retell

How we'll build your voice agent

Predictable 6-step process from first call to deployed agent

Discovery call

30–45 min call to understand your use case, channels, volume estimates, and chosen platform. Free for standard builds, ₹25,000 for enterprise (credited).

Scope + fixed-price quote

1-page scope document with exact deliverables, timeline, prompt strategy, and price. Two days to deliver.

40% deposit, build begins

Work starts within 2 business days of deposit. You get a Slack/email channel for daily updates.

Prompt engineering + flow build

Prompt drafted, flows configured in your chosen platform, voice + STT + TTS selected for your use case.

Internal QA + your UAT

We run 50+ test calls covering happy paths and edge cases. You sign off on UAT before production deploy.

Production deploy + handoff

Number assigned, agent live, final demo, documentation handoff. 60% balance due. Maintenance retainer starts day after launch.

Edesy build service vs. hiring a freelancer or in-house team

What the alternatives actually cost over 12 months

Feature	Dimension	Upwork freelancer	In-house engineer	Edesy
Prompt engineering expertise
Voice/STT/TTS provider knowledge
Latency optimization built-in
Indian language support out-of-box
Telephony setup included
Fixed price, no overruns
Bug-fix warranty post-launch
Maintenance when models/APIs change
12-month total cost (estimate)

Retell AI Build — FAQ

Other voice agent platforms we build on

Edesy (Recommended)

India-first platform.

Vapi

Developer-first platform.

Bolna

Indian open-source platform.

Bland AI

US-focused platform.

Ready to build on Retell AI?

Book a 30-minute scoping call. We'll send a fixed-price quote within one business day.

Get Retell Build Quote Contact Sales