Relay Agents vs Vapi: 2026 comparison
Human-in-the-loop workflow agents that connect 100+ apps with approvals.
Relay Agents vs Vapi — specs
| Spec | Relay Agents | Vapi |
|---|---|---|
| Agent Rank | 72 / 100 (A) | 68 / 100 (B) |
| Autonomy | Semi-autonomous | Autonomous |
| Pricing | Freemium · from $18 | Pay per task · Free tier |
| Open source | No | No |
| Capabilities | Tool use, Memory | Voice, Tool use, Memory |
| Integrations | 4 apps | 2 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
- 2
- Pricing value
- 9
- 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
- +Most developer-friendly voice agent in 2026 — SDK-first, well documented
- +BYO model gives full cost + behavior control
- +Pay-as-you-go makes prototyping nearly free
- −You build the conversation logic — not a turnkey product
- −Voice quality depends heavily on which provider you wire in
- −Less polished than Parloa for contact-center deployments
Pricing
- +200 runs/mo
- +All app integrations
- +2,000 runs/mo
- +Multi-step approvals
- +Conditional branching
- +Shared workflows
- +Audit log
- +Role-based access
- +$0.05/min base
- +BYO LLM provider
- +Full SDK + dashboard
- +Volume discounts
- +Dedicated infra option
- +SLA + support
Which one should you pick?
Pick Relay Agents if its specific capabilities (Tool use, Memory) match what you need.
Try Relay Agents →Pick Vapi if cost is the main constraint or if you want the highest autonomy and the verification loop is in place.
Try Vapi →Affiliate links. We may earn a commission at no extra cost to you.
Frequently asked
Should I pick Relay Agents or Vapi in 2026?+
Pick Relay Agents if its specific capabilities (Tool use, Memory) match what you need. Pick Vapi if cost is the main constraint or 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 Vapi for the workflows where its specific strengths matter.
What's the price difference between Relay Agents and Vapi?+
Relay Agents starts at Freemium · from $18; Vapi starts at Pay per task · Free tier. Vapi 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 Vapi?+
Vapi 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.