# Decagon vs Sierra

> Decagon: Enterprise AI agents that resolve customer conversations across chat, email and voice
> Sierra: Enterprise AI agents that handle customer conversations across voice, chat and messaging, priced by outcome

- Decagon profile: https://finderatlas.com/tools/decagon
- Sierra profile: https://finderatlas.com/tools/sierra
- Comparison page: https://finderatlas.com/compare/decagon-vs-sierra
- Last reviewed: October 2026

## Verdict

Decagon and Sierra are both AI Customer Support tools. Neither has a free plan.

### Choose Decagon if

- You want a tool built for large companies with high conversation volume that want AI agents handling chat, email and voice with testing and QA built in.
- Covers voice, chat and email in one platform rather than chat only.
- Natural-language AOPs let non-engineers define agent workflows.

### Choose Sierra if

- You want a tool built for large companies automating high-volume customer conversations across voice and digital channels with outcome-based pricing.
- Outcome-based pricing ties cost to results rather than seats or tokens.
- Covers voice, chat, SMS, WhatsApp, email and ChatGPT from one agent build.

## Pricing

| | Decagon | Sierra |
| --- | --- | --- |
| Pricing model | Paid | Paid |
| Free plan or trial | No | No |
| Starting price | Custom | Custom |

## Features

| Feature | Decagon | Sierra |
| --- | --- | --- |
| Agent Operating Procedures (AOPs) | Yes | Not listed |
| Voice, Chat and Email Agents | Yes | Not listed |
| Pre-built Integrations | Yes | Not listed |
| Experiments | Yes | Yes |
| Testing & QA | Yes | Not listed |
| Watchtower | Yes | Not listed |
| Insights & Reporting | Yes | Not listed |
| Suggestions | Yes | Not listed |
| Duet | Yes | Not listed |
| Personal Agent Detection | Yes | Not listed |
| Agent Studio | Not listed | Yes |
| Ghostwriter | Not listed | Yes |
| Voice agents | Not listed | Yes |
| Multi-channel deployment | Not listed | Yes |
| Horizon | Not listed | Yes |
| Context Engine | Not listed | Yes |
| Insights and Explorer | Not listed | Yes |
| Knowledge management | Not listed | Yes |
| Trust and reliability | Not listed | Yes |

## Platforms

| Platform | Decagon | Sierra |
| --- | --- | --- |
| Web | Yes | Yes |
| Windows | No | No |
| macOS | No | No |
| iOS | No | No |
| Android | No | No |
| API | No | No |
| Browser Extension | No | No |

## Decagon strengths

- Covers voice, chat and email in one platform rather than chat only.
- Natural-language AOPs let non-engineers define agent workflows.
- Built-in A/B experiments, simulations and always-on QA support ongoing tuning.
- Large enterprise customer list including airlines, telecoms and fintech companies.
- Offers a per-resolution pricing option where escalations are not charged.

## Decagon limitations

- No published pricing; every deal requires a sales conversation.
- No free tier or trial advertised, which limits evaluation by small teams.
- Reviewers have noted limited transparency into why the AI made a given decision.
- No public API or developer documentation was found on the official site.

## Sierra strengths

- Outcome-based pricing ties cost to results rather than seats or tokens.
- Covers voice, chat, SMS, WhatsApp, email and ChatGPT from one agent build.
- Ghostwriter can create agents from existing SOPs, transcripts or audio interviews.
- Large enterprise customer base named on the homepage, including Uber, Vanguard and Hyatt.
- Broad compliance list, including SOC 2, ISO 42001, HIPAA and FedRAMP.
- Built-in analytics, monitors and experiments for tuning agent behavior.

## Sierra limitations

- No published pricing and no self-serve signup or free trial found.
- Aimed at enterprises; small businesses are not the evident target.
- Outcome-based billing can make monthly cost harder to forecast.
- Public documentation for developers (API or SDK) was not found on the official site.

## FAQ

**Is Decagon better than Sierra?**

It depends on your workflow. Decagon is built for large companies with high conversation volume that want AI agents handling chat, email and voice with testing and QA built in. Sierra is built for large companies automating high-volume customer conversations across voice and digital channels with outcome-based pricing.

**What are the key feature differences between Decagon and Sierra?**

Decagon: Enterprise AI agents that resolve customer conversations across chat, email and voice. Sierra: Enterprise AI agents that handle customer conversations across voice, chat and messaging, priced by outcome.

**Does Decagon or Sierra have a free plan?**

Neither has a free plan. Both Decagon and Sierra are paid products.

**Which is cheaper, Decagon or Sierra?**

Both start at Custom, so the better value depends on which plan's limits fit your usage. See the pricing table above for what each tier includes.