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OpenGreet vs Retell AI

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. OpenGreet starts at $163, Retell AI at $0.07. Only Retell AI has a free tier. Only Retell AI ships a public API.

OpenGreetAI phone agents that make and take business calls for Singapore and Malaysia, priced in Singapore dollars.Retell AIBuild and run AI phone agents that book, qualify and transfer calls, billed by the minute.

Side by side

FactOpenGreetRetell AI
CategoryVoice Agents & Phone AIVoice Agents & Phone AI
Pricing modelPaidFreemium
Starts at$163 month$0.07 minute
Public APINoYes
PlatformsWebWeb, API
CompanyOpenGreetRetell AI Inc.
Launched—2023
Last verifiedSep 1, 2026Sep 6, 2026

What our research says

OpenGreet

OpenGreet is built specifically for Southeast Asian phone support with regional accent handling that generic voice-agent platforms tend to skip, which matters for a Singapore or Malaysia-based call operation. The tradeoff is a pricing model that stacks a flat monthly fee on top of per-minute and per-message usage charges, so cost is hard to predict without knowing call volume.

Pros

  • Built-in support for Singapore English, Mandarin, Malay, and Bahasa Indonesia accents
  • Handles both inbound and outbound calls plus SMS and chat follow-up
  • PDPA compliance called out explicitly for the Singapore and Malaysia market

Cons

  • Pricing combines a flat monthly fee with per-minute and per-message usage charges
  • Prices are quoted only in Singapore dollars with no published USD equivalent

Retell AI

One of the more honest voice-agent stacks: the pricing page breaks out infrastructure, TTS and LLM cost per minute so you can predict a call's cost instead of guessing. Telephony choice is wide and the concurrency allowance is generous. The catch is that per-minute billing plus add-ons makes a busy contact centre expensive fast, and the cheap end of the range only holds if you pick the cheap models.

Pros

  • Per-minute cost broken down by voice infrastructure, TTS provider and LLM on the public pricing page
  • Telephony via SIP trunking, Twilio and Vonage plus n8n, HubSpot, Make and Go High Level integrations
  • 20 concurrent calls included before any concurrency charge
  • Voice, chat and SMS agents share one platform and API
  • HIPAA path exists via a signed BAA covered in the terms of service

Cons

  • Cost per minute more than quadruples between the cheapest and most capable model combinations
  • Knowledge base, denoising, PII removal and branded caller ID are all metered extras
  • No flat-rate plan, so a spike in call volume lands straight on the invoice

Which one fits

Choose OpenGreet if you need

  • Singapore or Malaysia businesses automating sales and support calls
  • Companies needing multilingual regional-accent voice agents

Choose Retell AI if you need

  • Teams replacing an outbound qualification or booking script
  • Contact centres that already have Twilio, Vonage or SIP trunking
  • Developers who want per-minute cost visibility before launch

More comparisons

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