Decagon vs Sierra (2026): which should you pick?
As of Nov 12, 2026, Decagon and Sierra share a 1.6 GPA, neither has a free plan and their prices can't be set side by side, so the choice depends on which features you need.
Checked Nov 12, 2026 · graded Nov 12, 2026 by ToolGPA
They get the same grade on all five counts.
Price, platforms and features side by side. The table says where each price was read and when.
Decagon
AI concierge agents for customer support across voice, chat and email
Paid
Which one is for you
Pick Decagon if
- Fits if you run a support team and want agents on voice, chat and email
- Works for a company that buys through a demo
Look elsewhere if
- Skip it if you want a price: none is published and there is no pricing page
- Not for you if you want to try it free, as no self-serve plan or trial is shown
- Tight if you want integrations named: the site gives no list
Pick Sierra if
- Fits if you are a large brand with heavy customer service volume
- Makes sense if you want to pay by outcome rather than seat
Look elsewhere if
- Not for you if you want a price, as none is published
- Not for you if you want to try it, since there is no self-serve sign-up or free plan
- Skip it if you are small, because the site is aimed at large brands
- Watch out: no integrations are listed, so ask what it connects to
How we grade them
| 1.6GPADecagonWeak | 1.6GPASierraWeak | |
|---|---|---|
| Value for money | CNo prices are published and the site has no pricing page, so it sits in the middle by default. | CNo price is published; the site says pricing is outcome-based and points to a sales call. |
| Free plan and trial | FNo self-serve plan or free trial is shown. | FNo free plan and no sign-up. The route is a sales conversation. |
| Features | CAgent procedures, voice, chat and email, testing, experiments and insights. | CAn agent builder, channels, insights and observability are listed, but nothing in the listing says how far each goes. |
| Ease of use | CNo store rating on record. Procedures are written and tested by you, with onboarding through sales. | CNo store rating on record, and a large brand has to onboard it with the vendor. |
| Platforms and integrations | CWeb only, and the site gives no list of integrations by name. | CWeb only, and the site lists no integrations. |
| Best for | AI customer support agents | big consumer brands buying a service agent from the vendor |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Decagon and Sierra. How we grade
Where they differ
- Decagon also covers a/B testing.
In commonWebAI agentsAI support agentChatbots
At a glance
| Decagon | Sierra | |
|---|---|---|
| Pricing | Paid | Paid |
| Starts at | Not published | Not published |
| Free plan | None | None |
| Free trial | None listed | None listed |
| Web | ||
| Made by | Decagon | Sierra |
| Price read from | Not confirmed | Not confirmed |
| Checked | Nov 12, 2026 | Nov 12, 2026 |
Worth knowing
Decagon
- No prices are published and the site has no pricing page; the call to action is Get a demo.
- No self-serve plan or free trial is shown.
- The site gives no list of integrations by name.
Sierra
- No prices are published; Sierra says pricing is outcome-based and points visitors to a sales conversation.
- No self-serve sign-up or free plan is shown on the site.
- The site gives no list of integrations.
Key features
Decagon
- Agent Operating Procedures
- AOPs describe an agent's workflows in natural language instead of a configuration language, so behavior can be changed quickly.
- Voice, chat and email
- Agents work across voice, chat and email, and the site says they keep memory across channels.
- Testing and experiments
- Simulations run at scale before launch, and live A/B experiments compare versions of an agent.
- Watchtower and insights
- Watchtower is an always-on quality check, and reporting covers the voice of the customer.
- Duet
- An AI partner for building and improving agents.
Sierra
- Ghostwriter agent builder
- Builds an agent from uploaded SOPs, transcripts and recordings or a plain-English description, with guardrails and multilingual support.
- Channels
- A single agent can be deployed on chat, SMS, WhatsApp, email, voice and ChatGPT.
- Insights
- Explorer analyzes conversations, Monitors flags the ones that need attention, and Experiments runs multivariate tests.
- Observability
- Shows each agent action, including tool calls and knowledge lookups, along with latency.
- Horizon
- Plans multi-step outcomes over days or months, using memory of the customer across conversations and systems.
Plans
Decagon
Pricing could not be confirmed. See decagon.ai.
Sierra
Pricing could not be confirmed. See sierra.ai.
Common questions
Which is cheaper, Decagon or Sierra?
As of Nov 12, 2026, Decagon has no price we could confirm, and Sierra has no price we could confirm.
Which has a free plan, Decagon or Sierra?
As of Nov 12, 2026, neither Decagon nor Sierra has a free plan.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.