Relay vs Siena AI: side-by-side comparison of AI email drafting, pricing, and features. Which tool is better for teams managing support over Gmail or Outlo
| Feature | Relay | Siena AI |
|---|---|---|
| AI Email Drafting | Multi-LLM AI drafts | Autonomous AI agent |
| Human-in-the-Loop | Draft & review workflow | Autonomous with escalation |
| Knowledge Base | Built-in KB for AI | AI trained on brand voice |
| Multi-LLM Support | GPT-5, Claude, Gemini | Proprietary AI |
| Starting Price | $49/mo | Contact Sales |
Relay
AI drafts for human approval
Siena AI
Fully autonomous AI agent
Relay for human control; Siena for autonomy
Relay
Choose from multiple LLMs
Siena AI
Proprietary brand-voice AI
Relay has model flexibility; Siena has brand focus
Relay
Transparent from $49/mo
Siena AI
Contact sales for pricing
Relay is more accessible
Siena AI uses sales-based pricing. Relay offers transparent pricing from $49/mo.
Relay uses AI drafting with human review. Siena AI is a fully autonomous AI agent. Different automation philosophies.
Siena aims for full autonomy. Relay keeps humans reviewing each draft for quality assurance.
Relay at $49/mo with transparent pricing. Siena requires sales conversations.
Start your free trial and see why teams choose Relay over Siena AI for AI email support.