Decagon vs Siena AI
Which Customer Support AI tool is better in 2026?
Decagon
AI agents that actually solve customer problems
Siena AI
Empathic autonomous AI customer service agent for commerce brands
Side-by-side
Decagon is the more established option (raised $546M); pricing is comparable on both sides.
| Metric | Decagon | Siena AI |
|---|---|---|
| Taglinei | AI agents that actually solve customer problems | Empathic autonomous AI customer service agent for commerce brands |
| Foundedi | 2023 | 2022🏆 |
| HQi | San Francisco, US | San Francisco, US |
| Employeesi | 50-200 | 11-50🏆 |
| Neuron scorei | 64🏆 | 53 |
| Total fundingi | $546M🏆 | $11.1M |
| Latest roundi | Series D · Jan 2026 | Seed |
| Valuationi | $4.5B🏆 | — |
| Cheapest paid plani | — | Pricing not disclosed |
| Free plani | ✗ | ✓ |
| Free triali | ✗ | ✓ |
| Top tier pricei | Enterprise · Contact sales | Pricing not disclosed |
| Pricing summaryi | 1 published plans | Free |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Decagon and Siena AI.
| Capability | Decagon | Siena AI |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✓ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✗ | ✓ |
| Free trial | ✗ | ✓ |
| Verified | ✓ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Decagon
- Has raised more capital ($546M vs $11.1M)
- Higher Neuron score (64 vs 53)
- Newer company (2023)
- Verified profile
🔵 Strengths of Siena AI
- Offers a free plan
- Offers a free trial
- More mature (2022)
Which should you choose?
Choose Siena AI if price matters most — it starts at Free, which is friendlier for teams watching burn. Both AI Customer Support tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Decagon if you want the most established option — it has raised $546M, suggesting more runway for enterprise features, support, and long-term roadmap. For mission-critical workflows or larger teams, that stability often outweighs a lower monthly price.
Frequently asked questions
Decagon vs Siena AI — which is better?
It depends on your priority. Decagon has raised more capital and is the more established option; Siena AI has broader feature depth. See the side-by-side table above.
Is Decagon cheaper than Siena AI?
No — Siena AI's cheapest paid plan is Free, while Decagon's is Enterprise · Contact sales.
Do Decagon and Siena AI offer free plans?
Decagon: Paid only. Siena AI: Yes, has a free plan.
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