Retell AI publishes the numbers you can plan an outbound campaign with: 20 concurrent calls by default on pay-as-you-go and $0.10 a minute to Australian destinations over Twilio, in a currency its page does not state. Synthflow gates campaigns to Enterprise and scopes concurrency in the contract. Checked 8 September 2026.
What this covers
- The criteria that decide an outbound campaign, before any vendor names
- Synthflow vs Retell AI: the outbound decision table
- The verdict
- The seven-day campaign test: does your list fit inside Australian calling hours?
- Where each option is wrong for you
This is a technical summary. The full guide — with the tables and worked examples — is on our site: *Synthflow vs Retell AI for Outbound Calling*.
Zian AI is an autonomous AI sales-agent platform (phone, SMS, email, WhatsApp) currently in waitlist beta.
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