Voice Agent Platform Picker: Retell vs Kallflow vs Build Your Own

Answer 6 questions about your client and get a tier recommendation, with the specific reasoning behind it.

retellkallflowlivekitvoice-agentsplatform-comparison

Platform Picker

0 / 6 questions answered

Does this client have data privacy or compliance requirements?

Healthcare, legal, financial services, GDPR-strict EU clients, enterprise procurement with data residency clauses

Does the client want to own the agent infrastructure?

'We want it running on our servers', 'we want the keys when you're done', 'this is our IP'

What is the expected monthly call volume?

Estimate total minutes per month across all use cases for this client

Does the client have an in-house engineering team for ongoing maintenance?

A dev team that can own infrastructure, debug platform-specific issues, and handle 2am incidents

What is the client's budget model preference?

No right answer. Their preference between predictable fixed costs vs. usage-based billing.

Is a white-labelled or branded system a requirement?

'We want to present this as our own product', agency wants to resell under their brand

The Ownership Matrix: quick reference

Dimension	Retell	Kallflow	LiveKit DIY
Cost structure	Per-minute	Fixed sub + AI at cost	Infra only
Typical cost / min	$0.13 – $0.25	~$0.063 variable	~$0.05 – $0.08
Agent ownership	Retell's infra	Agency / client infra	Full
Data residency	Retell's servers	Client-controlled	Full control
Setup time	Days	Days – 1 week	Weeks – months
Maintenance	Low (platform)	Moderate	High
White-label	No	Yes	Yes
Best for	Standard SMB	Privacy, ownership, scale	Very high vol / custom

The kitchen, not the door

You know which tier fits the client. Here's how to set it up and close the deal.

Retell onboarding checklist, Kallflow deployment playbook, ownership pitch script, compliance pitch script, and the breakeven script for high-volume clients. Free trial.

Get the 3 setup playbooks + 3 pitch scripts