Fixie AI vs Synthflow
Two of the most-asked-about agents in the voice-agents space. Here's how they actually stack up.
Fixie AI
Developer platform for building voice AI agents that handle inbound and outbound phone calls
Free tier
Read full review →Synthflow
No-code voice agent builder with pre-built templates for receptionists, sales, and lead qualification
From $29/mo
Read full review →Side-by-side comparison
| Fixie AI | Synthflow | |
|---|---|---|
| Tagline | Developer platform for building voice AI agents that handle inbound and outbound phone calls | No-code voice agent builder with pre-built templates for receptionists, sales, and lead qualification |
| Pricing | Free tier | From $29/mo |
| Categories | voice-agents, voice, api, developer-tools | voice-agents, no-code |
| Made by | Fixie AI | Synthflow AI |
| Launched | 2023-05 | 2023 |
| Platforms | API, Web | Web, Phone |
| Status | active | active |
Fixie AI highlights
- + Real-time voice agents that handle phone calls with sub-second latency
- + Inbound and outbound call handling with programmable logic
- + Function calling so agents can query APIs, look up data, and take actions mid-call
- + Webhook integration for real-time event handling during conversations
- + Custom voice selection with multiple TTS providers
Synthflow highlights
- + Visual drag-and-drop agent builder with no coding required
- + Pre-built templates for AI receptionist, outbound sales caller, and lead qualifier roles
- + Phone number provisioning included at Pro and above tiers
- + CRM integrations with HubSpot, Salesforce, and GoHighLevel out of the box
- + Calendar integration for real-time appointment scheduling during calls
Frequently Asked Questions
Which is better, Fixie AI or Synthflow?
Neither is universally better. Fixie AI (Free tier) leans into voice-agents, while Synthflow (From $29/mo) is closer to voice-agents. Pick based on which workflow you actually do every day.
What is the price difference between Fixie AI and Synthflow?
Fixie AI is free tier. Synthflow is from $29/mo. See the pricing row in the comparison table.
Can I use Fixie AI and Synthflow together?
In most cases, yes. They serve overlapping but distinct needs, so running them side by side is common until you decide which fits your workflow.