Relay Agents vs Synthflow: 2026 comparison
Human-in-the-loop workflow agents that connect 100+ apps with approvals.
Relay Agents vs Synthflow — specs
| Spec | Relay Agents | Synthflow |
|---|---|---|
| Agent Rank | 72 / 100 (A) | 75 / 100 (A) |
| Autonomy | Semi-autonomous | Autonomous |
| Pricing | Freemium · from $18 | Freemium · from $29 |
| Open source | No | No |
| Capabilities | Tool use, Memory | Voice, Tool use, Memory |
| Integrations | 4 apps | 4 apps |
| Verified | Verified | Verified |
| Released | Mar 2025 | Feb 2025 |
Agent Rank breakdown
- Autonomy fit
- 8
- Capabilities
- 4
- Integrations
- 8
- Pricing value
- 8
- Polish & maturity
- 5
- Verifiability
- 10
Auto-computed from autonomy, capabilities, integrations, pricing, maturity and editorial verification. Updated every deploy. How is this computed?
- Autonomy fit
- 9
- Capabilities
- 6
- Integrations
- 8
- Pricing value
- 7
- Polish & maturity
- 5
- Verifiability
- 10
Auto-computed from autonomy, capabilities, integrations, pricing, maturity and editorial verification. Updated every deploy. How is this computed?
Pros & cons
- +Strongest human-in-the-loop pattern of any no-code agent
- +Connects 100+ apps with conditional logic and approval gates
- +Free tier is real — not a trial in disguise
- −AI features are lighter than purpose-built agent platforms
- −Per-seat pricing scales fast for larger teams
- −No native phone / voice support
- +Truly no-code — non-developers can ship a working voice agent in an afternoon
- +Templates cover most common voice-agent use cases (appointment scheduling, lead qual, surveys)
- +White-label option lets agencies resell to clients
- −No-code abstractions can hit ceilings for advanced logic
- −Voice quality slightly behind ElevenLabs-based stacks
- −Pro tier pricing is steep at $375/mo for 1,500 minutes
Pricing
- +200 runs/mo
- +All app integrations
- +2,000 runs/mo
- +Multi-step approvals
- +Conditional branching
- +Shared workflows
- +Audit log
- +Role-based access
- +50 minutes
- +Basic templates
- +1,500 minutes
- +CRM integrations
- +Outbound campaigns
- +3,500 minutes
- +Custom voice cloning
- +White-label option
- +Custom volumes
- +Dedicated CS
- +SSO
Which one should you pick?
Pick Synthflow if you want the highest autonomy and the verification loop is in place.
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Frequently asked
Should I pick Relay Agents or Synthflow in 2026?+
Pick Relay Agents if cost is the main constraint. Pick Synthflow if you want the highest autonomy and the verification loop is in place. Most working teams running both can use Relay Agents for primary work and Synthflow for the workflows where its specific strengths matter.
What's the price difference between Relay Agents and Synthflow?+
Relay Agents starts at Freemium · from $18; Synthflow starts at Freemium · from $29. Relay Agents is the cheaper entry option. For team deployments the TCO can differ — use the AI Agent Rank TCO calculator for your specific volume.
Which is more autonomous, Relay Agents or Synthflow?+
Synthflow is the more autonomous of the two (Autonomous vs Semi-autonomous). Higher autonomy ships throughput faster but requires verification loops in place — see our autonomous-vs-copilot framing for when each tier wins.