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AI Tool Comparison
Relay.app vs Retell AI
A side-by-side breakdown to help you pick the right tool for your workflow.
Relay.app
Turn plain-language descriptions into working automations across hundreds of apps, with human-in-the-loop approval steps built in.
Automation
freemium
Retell AI
Power phone and chat agents that sound natural in conversation, assembled from any mix of LLM, voice, and telephony provider.
Automation
freemium
Bottom Line
Relay.app and Retell AI are rated evenly — the right pick comes down to which workflow you're running.
Choose Relay.app if…
Automation
Choose Retell AI if…
Voice AI
| Attribute | Relay.app | Retell AI |
|---|---|---|
| Category | Automation | Automation |
| Pricing | freemium | freemium |
| Pricing Detail | Free (500 credits) / $19/mo Professional / $59/mo Team | Pay-as-you-go from $0.07-0.31/min / Enterprise custom |
| Rating |
Key Features
Relay.app
- Human approval steps
- AI actions
- Shared workflow visibility
- Template library
- Collaboration tools
Retell AI
- Inbound and outbound calling
- Visual call flow builder
- CRM integrations
- Call recording and transcripts
- Phone number provisioning
- Real-time analytics
Pros
Relay.app
- •Best for workflows requiring human review
- •Transparent and auditable
- •Good team features
- •Clean interface
Retell AI
- •Full-stack voice solution, less infrastructure than building from components
- •Visual workflow builder requires no code for call logic
- •Strong integrations with healthcare and real estate tools
Cons
Relay.app
- Less powerful than Make for complex flows
- Small app library
- Newer product
Retell AI
- Per-minute costs scale quickly at production volume
- Less model flexibility than raw API alternatives