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Decagon vs Sierra

Features, pricing, ratings, and pros and cons, side by side.

Sierra logo

Sierra

Enterprise AI agents that handle customer conversations across voice, chat and messaging, priced by outcome

Paid
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Verdict

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

Best overall

Decagon

  • Customer Support Leaders
  • CX Operations Teams
  • Enterprise Support Organizations
  • Contact Center Managers

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.
Best for beginners
Decagon
Best for business
Decagon

Features

19 features compared.

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

Pricing

Plans as listed by each vendor. Check their sites for current prices.

  • Pricing model
    Decagon
    Paid
    Sierra
    Paid
  • Free plan
    Decagon
    No
    Sierra
    No
  • Starting price
    Decagon
    Custom
    Sierra
    Custom
  • Plans
    Decagon
    1 plan
    Sierra
    1 plan

Decagon plans

  • Enterprise

    Most popular

    Custom/contact sales

    Quote-based contracts for support organizations

    • Chat
    • email and voice agents
    • AOPs
    • Experiments
    • Testing & QA
    • Watchtower
    • Insights & Reporting

Sierra plans

  • Enterprise

    Most popular

    Custom/custom

    Outcome-based pricing quoted through Sierra sales

    • Agent Studio
    • Ghostwriter
    • Insights
    • Multiple channels
    • Context Engine

Our ratings

Scored out of 10 by the Finder Atlas editorial team. Last reviewed October 2026.

Decagon
7.6overall
Sierra
7.6overall

Decagon leads in 2 categories and Sierra in 1, with 2 tied.

  • Ease of Use

    Tied
    Decagon
    7.5
    Sierra
    7.5

  • Feature Depth

    Decagon leads by 0.2
    Decagon
    8.7
    Sierra
    8.5

  • Value for Money

    Sierra leads by 0.2
    Decagon
    6.8
    Sierra
    7.0

  • Performance & Speed

    Tied
    Decagon
    8.0
    Sierra
    8.0

  • Documentation & Support

    Decagon leads by 0.2
    Decagon
    7.2
    Sierra
    7.0

Scores weigh documented features, plan value, platform coverage, integrations and user feedback. A missing score means we have not rated that area yet.

Pros and cons

Decagon

Pros

  • 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.

Cons

  • 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

Pros

  • 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.

Cons

  • 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.

Platforms

  • Web
    Decagon
    Supported
    Sierra
    Supported
  • Windows
    Decagon
    Not supported
    Sierra
    Not supported
  • macOS
    Decagon
    Not supported
    Sierra
    Not supported
  • iOS
    Decagon
    Not supported
    Sierra
    Not supported
  • Android
    Decagon
    Not supported
    Sierra
    Not supported
  • API
    Decagon
    Not supported
    Sierra
    Not supported
  • Browser Extension
    Decagon
    Not supported
    Sierra
    Not supported

Integrations

Decagon

No integrations listed.

Sierra

9 integrations
  • Snowflake
  • Databricks
  • Redis
  • AWS
  • Google Cloud
  • Slack
  • Microsoft Teams
  • WhatsApp
  • ChatGPT

Company

  • Company
    Decagon
    Decagon
    Sierra
    Sierra Technologies, Inc.
  • Founded
    Decagon
    2023
    Sierra
    2023
  • Headquarters
    Decagon
    San Francisco, CA
    Sierra
    San Francisco, USA
  • Listing
    Decagon
    Claimed
    Sierra
    Claimed

Frequently asked questions

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.