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Decagon vs Plain

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

Plain logo

Plain

AI-powered support platform for B2B teams, unifying Slack, email and chat in one workspace

Free trial
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Verdict

Decagon is listed under AI Customer Support and Plain under Help Desk Software. Plain scores higher in FinderAtlas's editorial review (7.9 vs 7.6 out of 10), led by ease of use and value for money. Neither has a free plan. Only Plain offers an API.

Best overall

Plain

  • B2B SaaS companies
  • Support teams
  • Customer success teams
  • Startups

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 Plain if

  • You want a tool built for Teams that support business customers through shared Slack or Teams channels and want AI triage, routing and an API-first setup.
  • Built around B2B support, with Slack, Teams and Discord channels alongside email and chat.
  • Ari and Sidekick AI agents are included from the entry plan.
Best for beginners
Plain
Best for business
Decagon

Features

18 features compared.

  • Agent Operating Procedures (AOPs)
    Decagon
    Available
    Plain
    Not available
  • Voice, Chat and Email Agents
    Decagon
    Available
    Plain
    Not available
  • Pre-built Integrations
    Decagon
    Available
    Plain
    Not available
  • Experiments
    Decagon
    Available
    Plain
    Not available
  • Testing & QA
    Decagon
    Available
    Plain
    Not available
  • Watchtower
    Decagon
    Available
    Plain
    Not available
  • Insights & Reporting
    Decagon
    Available
    Plain
    Not available
  • Suggestions
    Decagon
    Available
    Plain
    Not available
  • Duet
    Decagon
    Available
    Plain
    Not available
  • Personal Agent Detection
    Decagon
    Available
    Plain
    Not available
  • Multichannel Inbox
    Decagon
    Not available
    Plain
    Available
  • Ari AI Agent
    Decagon
    Not available
    Plain
    Available
  • Sidekick
    Decagon
    Not available
    Plain
    Available
  • Workflows
    Decagon
    Not available
    Plain
    Available
  • Insights
    Decagon
    Not available
    Plain
    Available
  • Bring Your Own Agents
    Decagon
    Not available
    Plain
    Available
  • API
    Decagon
    Limited
    Plain
    Available
  • Help Center and Knowledge Base
    Decagon
    Not available
    Plain
    Available

Limited means partial support or a paid add-on.

Pricing

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

  • Pricing model
    Decagon
    Paid
    Plain
    Free trial
  • Free plan
    Decagon
    No
    Plain
    No
  • Starting price
    Decagon
    Custom
    Plain
    $45
  • Plans
    Decagon
    1 plan
    Plain
    3 plans

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

Plain plans

  • Foundation

    Most popular

    $45/user/mo

    Small teams getting started with support

    • 1,000 credits/month
    • Sidekick
    • Ari
    • AI workflows
    • Slack
    • email and in-app channels
    • Linear and Jira integrations
    • Help Center
    • Knowledge Base

  • Horizon

    $99/user/mo

    Growing teams with more complex workflows

    • 2,500 credits/month
    • Microsoft Teams
    • SLAs and business hours
    • escalation paths
    • CRM integrations
    • reporting themes
    • AI suggested responses

  • Frontier

    Custom/custom

    Larger organizations needing governance and control

    • Custom credits
    • multiple workspaces
    • custom contracting
    • advanced security
    • SSO and SCIM
    • HIPAA
    • white glove onboarding
    • dedicated customer success manager

Our ratings

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

Decagon
7.6overall
Plain
7.9overall

Decagon leads in 2 categories and Plain in 3.

  • Ease of Use

    Plain leads by 0.5
    Decagon
    7.5
    Plain
    8.0

  • Feature Depth

    Decagon leads by 0.5
    Decagon
    8.7
    Plain
    8.2

  • Value for Money

    Plain leads by 0.5
    Decagon
    6.8
    Plain
    7.3

  • Performance & Speed

    Decagon leads by 0.2
    Decagon
    8.0
    Plain
    7.8

  • Documentation & Support

    Plain leads by 0.8
    Decagon
    7.2
    Plain
    8.0

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.

Plain

Pros

  • Built around B2B support, with Slack, Teams and Discord channels alongside email and chat.
  • Ari and Sidekick AI agents are included from the entry plan.
  • API-first design allows custom workflows and embedding.
  • 7-day trial without a credit card, plus a 50% startup discount.
  • Enterprise options include SSO, SCIM and HIPAA on the Frontier plan.

Cons

  • No permanently free plan; paid plans start at $45 per user per month.
  • AI usage is metered in credits (1,000 per month on Foundation), which makes costs harder to predict.
  • Microsoft Teams and CRM integrations require the $99 Horizon plan.
  • No iOS or Android app was found.

Platforms

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

Integrations

Decagon

No integrations listed.

Plain

6 integrations
  • Slack
  • Microsoft Teams
  • Discord
  • Linear
  • Jira
  • PagerDuty

Company

  • Company
    Decagon
    Decagon
    Plain
    Plain
  • Founded
    Decagon
    2023
    Plain
    2020
  • Headquarters
    Decagon
    San Francisco, CA
    Plain
    London, United Kingdom
  • Listing
    Decagon
    Claimed
    Plain
    Claimed

Frequently asked questions

Is Decagon better than Plain?

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. Plain is built for Teams that support business customers through shared Slack or Teams channels and want AI triage, routing and an API-first setup.

What are the key feature differences between Decagon and Plain?

Decagon: Enterprise AI agents that resolve customer conversations across chat, email and voice. Plain: AI-powered support platform for B2B teams, unifying Slack, email and chat in one workspace.

Does Decagon or Plain have a free plan?

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

Which is cheaper, Decagon or Plain?

Decagon starts at Custom and Plain starts at $45. See the pricing table above for what each tier includes.