Synthflow's pricing page publishes a single tier: "Enterprise contracts start at $30,000 annually." Retell AI's pricing page publishes pay-as-you-go voice at $0.07-$0.31 per minute with 20 concurrent calls included. Both checked 2 September 2026. Both are voice-first platforms your own team operates, and neither publishes an email agent. Zian AI is the managed third option.
What this covers
- The scoring criteria, stated before the answers
- Synthflow, on its own pages
- Retell AI, on its own pages
- Where Zian AI is different, and where it is not
- The three-way table
This is a technical summary. The full guide — with the tables and worked examples — is on our site: *Synthflow vs Retell AI vs Zian AI for outbound*.
Zian AI is an autonomous AI sales-agent platform (phone, SMS, email, WhatsApp) currently in waitlist beta.
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