Complete FAQ covering AI voice agent pricing: per-minute costs, platform fees, hidden costs, free tiers, ROI calculations, and budgeting.
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How much does an AI voice agent cost per month?
For a typical small local business, $50-$200/month all-in. This includes platform subscription ($0-$299/month), per-minute call costs ($0.05-$0.15/min), phone number ($1-$5/month), and ongoing maintenance.
Is there a free AI voice agent?
Synthflow offers 100 minutes/month free forever — enough for very small businesses. Beyond that, all platforms require payment for production use.
What's the per-minute cost?
$0.05-$0.15 per minute depending on platform and TTS voice used. Vapi is cheapest at $0.05-$0.12; Retell AI is most expensive at $0.07-$0.15.
Are there hidden costs?
Yes — premium TTS voices ($0.02-$0.04/min), LLM tokens ($0.02-$0.10/call), Zapier bridges ($29-$100/month), HIPAA BAA ($200-$500/month). Budget 1.5-2.5x the headline price.
How much should I budget for setup?
$0 (DIY with Synthflow) or $500-$2,500 (freelancer for Vapi/Retell). Plus 15-25 hours of your time valued at $50-$100/hour.
What's the ROI?
Typically 20-50x return for service businesses. Most companies recover their annual AI cost in 2-6 weeks.
Should I sign an annual contract?
Only after 30+ days of testing. Annual contracts save 15-20% but lock you in. Read early-termination clauses carefully.
What's the cheapest platform?
At low volume (under 30 calls/day), Synthflow's free tier. At moderate volume, Vapi. At high volume (500+ calls/day), Bland AI with volume discounts.
What's the most expensive platform?
Retell AI — ~25-35% premium over Vapi and Synthflow. Worth it for high-stakes conversations where call quality matters.
Do I need to pay for HIPAA compliance?
Yes, if you're in healthcare. HIPAA BAA costs $200-$500/month extra on enterprise plans. Required for any healthcare, dental, or medical use.