Compare

Two tools, side by side. Openness included.

Pick two. The table shows their rating, their Openness score and the facts behind it, each from the vendor's own pages.

Platform A

Platform B

Side by side

Retell AISupport & Serve Customers

STOA rating

6.3 / 10

Openness

OPENNESS 8/10API 3/3 · Export 2/3 · Contract 2/2 · Integrations 1/2

Add another tool (up to 4)

Want to compare general tools, like two CRMs or two project tools? Every tool page has a Compare button, with no limit.

Neither one does what you need?

Grab a 15-minute chat. Sometimes the answer is to build the missing piece next to what you run.

Grab a 15-minute chat

API

Retell documents a REST API to manage agents, calls and numbers, and its pricing page says every plan gets full platform access. docs.retellai.com, checked 6 Oct 2026 (opens in a new tab)

Your data

Retell lets you self-serve export call history as a CSV with the columns you choose. docs.retellai.com, checked 6 Oct 2026 (opens in a new tab)

Contract

Retell's self-serve plan is pay-as-you-go with no contracts and no minimum spend. retellai.com, checked 6 Oct 2026 (opens in a new tab)

What it does

AI voice agent platform — deploy human-sounding phone agents for inbound and outbound calls. Drag-and-drop call flow builder, knowledge base connection via RAG, and fast response times. Pay-as-you-go: $0.07+/min. $10 free credit. HIPAA and SOC2 compliant.

Strengths

Voice quality and response speed among the best
Pay-as-you-go — no commitment, only pay for connected calls
HIPAA, SOC2, GDPR compliance for regulated industries
Drag-and-drop builder for non-technical team members

Weaknesses

Per-minute costs ($0.13-$0.31 with LLM/voice) add up at volume
Phone calls only — need other tools for chat, email, SMS
Newer platform with smaller ecosystem
Complex call flows still need technical setup

Key features

AI agents answer calls, book appointments, process payments, transfer to humans
~600ms response latency for natural conversations
Drag-and-drop call flow builder — no coding required
Knowledge base via streaming RAG for accurate answers
Post-call transcripts, analysis, and QA dashboards

AI features

Retell AI uses AI to power phone agents that sound like real people, handling inbound and outbound calls with about 600ms response time. It connects to your knowledge base using RAG (retrieval-augmented generation) so the AI can answer questions based on your specific business information.

STOA verdict

Retail AI is best for small businesses that handle a high volume of phone calls and want to automate them without hiring more staff — think medical offices, real estate agencies, or service businesses. The pay-as-you-go pricing at $0.07+ per minute means you only pay for what you use, and the drag-and-drop builder makes setup approachable without a developer. The catch is that voice AI still makes mistakes, so you'll need to monitor calls closely and it may not be ready to fully replace a human for complex or sensitive conversations.