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Customer Support · head to head

Plain vs Reply.io

Plain logo

Plain

Customer Support

AI support infrastructure built for B2B teams

From
$35/month
Free plan
No
Full reviewWebsite
Reply.io logo

Reply.io

CRM

Multichannel sales engagement platform for email, LinkedIn, calls and SMS outreach

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Only Reply.io has a free tier, so it costs nothing to try first.
  • Each has a real cost: Plain foundation plan limited to 2,000 credits per month may be restrictive for high-volume teams; Reply.io multichannel features and CRM sync require the higher-priced Professional tier or above.
  • They diverge on capability: Plain covers Multi-channel consolidation, Reply.io covers Multichannel sequences.
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Plain and Reply.io actually diverge.

Attributes where Plain and Reply.io differ
AttributePlainReply.io
Starting price$35/monthFree
Pricing modelTiered pricing per seat with credit systemsubscription
Free tierNoYes
CategoryCustomer SupportCRM
FoundedUnknown2014

Identical on both: platforms (Web, API), 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 Plain

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

Only in Reply.io

  • Multichannel sequences
  • Contact database
  • AI email assistant
  • Deliverability tools
  • CRM sync
  • Reporting and analytics

What people use each for

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

Plain

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

Reply.io

  • Running multichannel outbound sequences combining email and LinkedInnot Plain
  • Automating cold calling and SMS follow-ups alongside emailnot Plain
  • Finding new B2B prospects from a built-in contact databasenot Plain
  • Syncing outreach activity into an existing CRMnot Plain

Where each one falls short

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

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

Reply.io

  • Multichannel features and CRM sync require the higher-priced Professional tier or above.
  • LinkedIn and calling/SMS automation are billed as separate per-account add-ons on top of plan pricing.
  • Pricing is per user, which can raise costs quickly for larger sales teams.
  • Monthly (non-annual) billing carries a notable price premium over the advertised annual rates.

Pricing, plan by plan

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

Reply.io

Free
  • FreeFree
    • Limited monthly emails
    • Basic sequence features
  • Starter$49/month
    • Email-only sequences
    • Billed annually per user
  • Professional$89/month
    • Multichannel sequences
    • CRM sync
    • Billed annually per user
  • Ultimate$139/month
    • Full AI suite
    • Highest sending limits
    • Advanced reporting and integrations

Which should you pick?

Choose Plain if

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

Choose Reply.io if

  • You need multichannel sequences.
  • You want to start without paying.
  • You work on web, api.
  • You also want contact database.
Reply.io review

Questions people ask

Is Plain or Reply.io better?
Neither clearly leads. Plain starts at $35/month and Reply.io at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Plain or Reply.io?
Reply.io has a free tier; the other does not. Paid plans start at $35/month for Plain and Free for Reply.io.
Does Plain or Reply.io run on more platforms?
Plain runs on Web, API. Reply.io runs on web, api.
Can I use Reply.io for free?
Yes. Reply.io has a free tier, so you can try it without paying. Plain starts at $35/month.
What is Plain best used for?
Plain is most often used for consolidating support from multiple channels into one inbox, automating support workflows with ai agents, extracting insights and trends from customer conversations, building custom support solutions with api access. Of those, consolidating support from multiple channels into one inbox and automating support workflows with ai agents are not what Reply.io is typically brought in for.
What can Plain do that Reply.io cannot?
Plain covers Multi-channel consolidation, AI agents, Workflow automation, Sidekick assistant. Reply.io covers Multichannel sequences, Contact database, AI email assistant, Deliverability tools.

Answered from the vendors’ own pages

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
Plain: Can I use Plain with Microsoft Teams?

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

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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