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Capacity vs Plain

Capacity logo

Capacity

Live Chat

AI-powered customer service automation platform

From
On request
Free plan
No
Full reviewWebsite
Plain logo

Plain

Customer Support

AI support infrastructure built for B2B teams

From
$35/month
Free plan
No
Full reviewWebsite

The short version

  • Each has a real cost: Capacity two-part pricing, an annual platform fee plus usage, so the bill is not knowable from the tier alone; Plain foundation plan limited to 2,000 credits per month may be restrictive for high-volume teams
  • They diverge on capability: Capacity covers AI chatbot, Plain covers Multi-channel consolidation.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Capacity and Plain actually diverge.

Attributes where Capacity and Plain differ
AttributeCapacityPlain
Starting priceOn request$35/month
Pricing modelsubscriptionTiered pricing per seat with credit system
PlatformsWeb, Mobile, Chat widgets, APIWeb, API
CategoryLive ChatCustomer Support
Founded2016Unknown

Identical on both: free tier (No), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Capacity

  • AI chatbot
  • Knowledge management
  • Multi-channel support
  • Analytics
  • Salesforce
  • Zendesk
  • Slack
  • ServiceNow

Only in Plain

  • Multi-channel consolidation
  • AI agents
  • Workflow automation
  • Sidekick assistant
  • Insights engine
  • Linear and Jira integration
  • Help Center and Knowledge Base
  • API-first extensibility

What people use each for

The jobs each tool is most often brought in to do.

Capacity

  • Knowledge base and helpdesk deflectionnot Plain
  • AI agents answering across chat, voice, email and SMSnot Plain
  • Real-time assistance for human agents on a callnot Plain
  • Automating multi-step support workflowsnot Plain
  • Regulated support environments needing the HIPAA packagenot Plain

Plain

  • Consolidating support from multiple channels into one inboxnot Capacity
  • Automating support workflows with AI agentsnot Capacity
  • Extracting insights and trends from customer conversationsnot Capacity
  • Building custom support solutions with API accessnot Capacity
  • Implementing AI-assisted customer support at scalenot Capacity

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Capacity

  • Two-part pricing, an annual platform fee plus usage, so the bill is not knowable from the tier alone
  • AI usage is metered by channel: per response on chat and email, per minute on voice and per message on SMS
  • Agent Assist and conversation intelligence are charged per hour of agent time on top
  • Live chat, agent assist and conversation intelligence require the Pro tier
  • The HIPAA package and advanced workflows are Enterprise only
  • No prices are published for any tier

Plain

  • Foundation plan limited to 2,000 credits per month may be restrictive for high-volume teams
  • Pricing increases significantly from Foundation to Horizon ($35 to $299 per month)
  • No published pricing for Frontier (custom) plan
  • Additional seat costs ($99 per seat) add up for larger teams
  • Credit-based system requires monitoring usage to avoid overages

Pricing, plan by plan

Capacity

On request
  • Starter$125/month
    • AI chatbot
    • Up to 50 articles
  • Professional$300/month
    • Unlimited articles
    • Advanced AI
  • Enterprise$undefined/month
    • Full customization
    • Dedicated support

Plain

$35/month
  • Foundation$35/month
    • 2,000 credits per month
    • Slack and email channels
    • Ari AI agent
  • Horizon$299/month
    • 15,000 credits per month
    • All Foundation features
    • Microsoft Teams integration
  • Frontier$null/custom
    • Custom credit allowance
    • All Horizon features
    • Discord channels

Which should you pick?

Choose Capacity if

  • You need ai chatbot.
  • You work on Web, Mobile, Chat widgets, API.
  • You also want knowledge management.
Capacity review

Choose Plain if

  • You need multi-channel consolidation.
  • You work on Web, API.
  • You also want ai agents.
Plain review

Questions people ask

Is Capacity or Plain better?
Neither clearly leads. Capacity starts at On request and Plain at $35/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Capacity or Plain?
Capacity starts at On request and Plain at $35/month.
Does Capacity or Plain run on more platforms?
Capacity runs on Web, Mobile, Chat widgets, API. Plain runs on Web, API.
What is Capacity best used for?
Capacity is most often used for knowledge base and helpdesk deflection, ai agents answering across chat, voice, email and sms, real-time assistance for human agents on a call, automating multi-step support workflows. Of those, knowledge base and helpdesk deflection and ai agents answering across chat, voice, email and sms are not what Plain is typically brought in for.
What can Capacity do that Plain cannot?
Capacity covers AI chatbot, Knowledge management, Multi-channel support, Analytics. Plain covers Multi-channel consolidation, AI agents, Workflow automation, Sidekick assistant.

Answered from the vendors’ own pages

Capacity: How much does Capacity cost?

Capacity does not publish pricing on their website. The company uses a tiered platform model with usage-based add-ons, stating customers pay a platform fee plus usage-based pricing for AI Agents. Interested customers must contact their sales team or use the ROI calculator for custom quotes.

Source
Plain: What is included in the Foundation plan?

The Foundation plan ($35/month per seat) includes 2,000 credits per month, support for Slack and email, Ari AI agent, Linear and Jira integrations, and Help Center access. Up to 5 seats are included.

Source
Capacity: What is Capacity's pricing model?

Capacity charges a platform fee for three tiers (Core, Pro, Enterprise) plus usage-based fees for Chat Agents (per response), Voice Agents (per minute), Email Agents (per response), SMS Agents (per message), and Agent Assist features (per hour of agent time).

Source
Plain: Can I use Plain with Microsoft Teams?

Yes, Microsoft Teams integration is available on the Horizon plan ($299/month) and higher.

Source
Capacity: What are Capacity's available tiers?

Capacity offers Core tier (essential tools to launch AI support), Pro tier (most popular, with live chat and conversation intelligence), and Enterprise tier (full suite with advanced compliance, HIPAA compliance available). Pricing requires contacting sales.

Source
Plain: Is there a free trial for Plain?

Yes, Plain offers a 7-day free trial with no credit card required. You can also get 50% discount through their startup program.

Source
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