Plain
AI support infrastructure for B2B teams to build custom workflows.
Plain is the strongest AI-first support infrastructure for B2B teams that live in Slack and want API-driven customization. Sidekick and multi-agent orchestration are genuinely useful, but the credit system can surprise teams with volume. Evaluate your ticket count before committing.
- B2B product teams needing consolidated multi-channel support (Slack, Teams, Discord, email)
- Engineering-heavy support teams that want API-first, customizable workflows
- Scaling startups requiring AI agents to triage and resolve common issues
- Teams automating complex routing and workflows with AI decision-making
- Small teams with very low ticket volume and simple email-only support
- Organizations needing a traditional ticketing system with strict out-of-box structure
- Teams that require phone or voice channel support (not mentioned)
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Skip Plain if you need a simple, low-cost, email-only helpdesk or if your team requires phone support.
Credits overage: Foundation includes only 2,000 AI credits/month; Horizon includes 15,000. Exceeding may require upgrade or additional costs.
Plain starts at $35/seat/month (Foundation, 1 seat) and scales to $299/month (Horizon, 3 seats) + $99/additional seat. This is premium compared to alternatives like Front ($15/seat/month) or Intercom ($74/seat/month for Starter). However, for B2B teams needing API-first extensibility and multi-channel AI orchestration, Plain's pricing reflects its flexibility. The startup program offers 50% off. Smaller teams on a budget may find cheaper alternatives suffice.
In short
Plain — AI support infrastructure for B2B teams to build custom workflows. Best for B2B product teams needing consolidated multi-channel support (Slack, Teams, Discord, email), Engineering-heavy support teams that want API-first, customizable workflows, Scaling startups requiring AI agents to triage and resolve common issues. Free to start; paid plans from $35/mo.
What's new in Plain
Checked 14 days agoAcross the latest 6 updates: 2 feature updates, 1 pricing change and 3 news mentions.
Thread fields now passable via chat widget
Thread fields can now be set via chat widget initialization, so context arrives with the conversation.
Customer Support on Discord: The B2B Guide (2026)
Covers how 141 of 2,216 B2B support conversations happened on Discord; best practices for multi-channel support.
Customer Support SLAs for B2B SaaS: How to Set, Measure, and Actually Hit Them (2026)
Guide on setting SLA targets by priority, measuring across channels, and hitting them at scale.
AI Ticket Deflection for B2B SaaS: Cut Volume Without the Per-Resolution Penalty (2026)
Discusses per-resolution AI pricing pitfalls and how n8n reduces ticket volume without penalties.
Sidekick can now take actions across tools with approval
Sidekick actions allow creating Linear issues, updating Notion, and acting on threads; requires user approval.
Sidekick is free for your whole team until 13 July
Until July 13, Sidekick is free with no usage allowance for the entire team.
Viability Score
How likely is Plain to still be operational in 12 months? Based on 4 signals — momentum (how recently it shipped), wrapper dependency, revenue model, and web presence.
Last calculated: July 2026
How we score →Key Features
- Consolidate Slack, Teams, Discord, email, in-app into one workspace
- Ari AI agent for triage and resolution
- Sidekick AI assistant in-app and in Slack
- Sidekick actions across tools (Linear, Notion) with approval
- Custom AI agents with own models and data
- Multi-agent orchestration with human handoff
- AI-driven auto-label, urgency detection, thread summaries
- Automated trend detection and daily digests
- Pause threads indefinitely
- Machine users link Linear issues via API
- AI workflow automation with manual triggers
- Help Center with Ask AI self-service
- CSAT surveys and sentiment analysis
- SLAs, business hours, customer tiers
- API-first: GraphQL, webhooks, events
About Plain
Plain is AI-powered support infrastructure built for B2B product teams that need flexibility over rigidity. It consolidates Slack, Microsoft Teams, Discord, email, and in-app forms into a unified workspace, then layers on AI agents (Ari, Sidekick, and custom agents) to triage, resolve, and automate. The platform is API-first, so teams can extend every piece—no-code or all-code. Sidekick, now free for the whole team until July 13, 2026, can draft replies, summarize threads, and even take actions across tools like Linear and Notion with user approval. Multi-agent orchestration lets you run Ari alongside custom agents, each with its own models and data, while automated trend detection and daily digests surface insights without manual effort. On the workflow side, Plain offers AI routing, auto-labeling, urgency detection, and thread summaries. You can pause threads indefinitely, set SLAs and business hours, and build custom automation with triggers and actions. The Foundation plan ($35/seat/month, 2,000 credits) covers Slack, email, in-app, Ari, Sidekick, and Linear/Jira integrations. Horizon ($299/month for 3 seats, 15,000 credits) adds Microsoft Teams, SLAs, Help Center, CRM integrations, and priority Slack support. Frontier is custom with Discord, custom AI, SSO/SCIM, and a dedicated CSM. Where Plain stands out is its refusal to lock you into rigid workflows. Traditional tools like Zendesk or Intercom impose opinions; Plain gives building blocks. Companies like Sourcegraph and Prisma use it to cut response times and keep teams happy. If you want an AI-driven support stack that grows with your code and your channels, Plain is worth a serious look.
Behind the Verdict
We'd reach for Plain when your support team already operates across Slack, Discord, and email, and you're frustrated by rigid ticket systems that force your workflow into their mold. Plain's API-first approach means you can build custom automations, embed support data anywhere, and let AI handle triage without dictating how you work. Sidekick is a real time-saver—it's always there with a keyboard shortcut, knows customer history, and can now take actions like creating a Linear issue (with your approval). The free trial through July 13 for Sidekick is a nice touch for teams to test it risk-free. Where it bites: the credit system. Each AI action (Sidekick query, Ari resolution, workflow AI routing) consumes credits. Foundation includes 2,000 credits/month, which sounds fine until you have a high-volume week. Horizon gives 15,000 credits, but at $99 per extra seat, the cost adds up fast. If you're handling thousands of conversations, the Frontier custom plan with unlimited everything is the safe choice, but you'll need to negotiate pricing. Compared to Intercom, Plain is more open and engineer-friendly. Intercom has better out-of-box reporting and a larger app ecosystem, but Plain's API and workflow builder let you replicate those capabilities with your own stack. Compared to Zendesk, Plain is a generation ahead on AI and Slack integration—Zendesk's Slack experience feels bolted on, while Plain was built for it from day one. In practice, teams that love Plain are engineering-heavy and value customization over hand-holding. If you want a set-it-and-forget-it help desk, look elsewhere. If you want to build your own support stack with AI as the core, Plain is a strong bet. Just watch those credits.
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Real-world workflow fit
Concrete scenarios for the personas Plain actually fits — and what changes day-one when you adopt it.
A critical customer reports a bug via Slack. The engineer @mentions Plain's Sidekick in Slack to get context from past threads, then uses Ari to triage and create a Linear issue automatically. Workflow auto-assigns the bug label and notifies the engineering team.
Outcome: First response time drops from 1 hour to under 5 minutes; engineering team gets a structured issue with full context within seconds.
CSM wants to identify churn risks. They use Plain's Insights to see trending topics and daily summaries. They spot a spike in billing-related complaints and proactively reach out to affected customers via the in-app chat.
Outcome: CSM reduces churn by addressing issues before escalation; gains a data-driven view of customer sentiment across all channels.
The team uses Plain to consolidate Slack, email, and Microsoft Teams. They set up AI workflows to auto-route urgent threads to senior agents based on sentiment and customer tier. Sidekick drafts replies, cutting manual response time by half.
Outcome: Team handles 2x ticket volume with same headcount; consistent, fast responses across all channels.
Use Cases
- Manage support across Slack, email, and in-app chat from a single workspace with AI triage.
- Build custom AI agents that autonomously resolve common tier-1 questions before escalating to humans.
- Automate routing of support tickets to engineering teams by creating Linear issues directly from conversations.
- Embed a support portal and customer cards into your SaaS product using Plain's GraphQL API and UI components.
- Track churn signals and product feedback by analyzing support themes with Plain's Insights reporting.
- Migrate from Zendesk, Intercom, or Help Scout to an API-first support stack that your team can extend.
- Use Sidekick in Slack to instantly get answers from help center, threads, and connected tools without leaving Slack.
- Orchestrate multiple AI agents alongside humans, with Plain's infrastructure coordinating handoffs.
Models Under the Hood
as of 2026-07-05
Limitations
- Credits cap AI usage per plan (2,000/mo on Foundation, 15,000/mo on Horizon).
- AI features on Foundation are limited; advanced AI like custom agents require Frontier.
- Some integrations (e.g., Sidekick actions) are in beta and require approval.
- Foundation plan caps at 5 user seats, Horizon at 10 seats, which may limit scaling without upgrading to custom Frontier.
as of 2026-06-24
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published Plain tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Foundation
$35/seat/month, billed yearly
Ideal for
Small B2B teams (1-5 seats) getting started with multi-channel support; need Slack, email, and in-app chat with basic AI triage via Ari.
What this tier adds
Starting tier at $35/month (1 seat) + $35/additional seat. Includes 2,000 AI credits/month, Slack/email/in-app channels, Ari agent, Linear/Jira integrations, AI workflows, and Sidekick assistant.
Horizon
$299/month for 3 seats, billed yearly
Ideal for
Growing B2B teams (3-10 seats) needing Microsoft Teams, SLAs, escalation paths, CRM integrations, and AI suggested responses. Scales support with confidence.
What this tier adds
Adds $299/month (3 seats) + $99/additional seat, 15,000 credits/month, Microsoft Teams, SLAs/business hours, escalation paths, help center/knowledge base, CRM integrations, reporting themes, AI suggested responses, and priority Slack support.
Frontier
Custom, billed yearly
Ideal for
Large or complex B2B teams requiring custom AI agents, bring-your-own-model, custom workspaces, advanced security (SSO/SCIM), and dedicated support.
What this tier adds
Custom pricing with custom credits, Discord channels, Lookup with Cursor, custom workspaces/contracting, advanced security, custom AI + BYO agent, dedicated CSM, and white-glove onboarding.
Where the pricing makes sense
The company stage and team size where Plain's pricing actually pencils out — and where peers do it cheaper.
Plain starts at $35/seat/month (Foundation, 1 seat) and scales to $299/month (Horizon, 3 seats) + $99/additional seat. This is premium compared to alternatives like Front ($15/seat/month) or Intercom ($74/seat/month for Starter). However, for B2B teams needing API-first extensibility and multi-channel AI orchestration, Plain's pricing reflects its flexibility. The startup program offers 50% off. Smaller teams on a budget may find cheaper alternatives suffice.
Setup time & first value
How long it actually takes to get something useful out of Plain — broken out by persona, not the marketing-page minute.
For a small team (1-5 seats), you can connect Slack, email, and in-app forms and start receiving threads within 30 minutes. AI agents and workflows require a few hours to configure, depending on complexity. Self-serve onboarding with docs and API gets you to first value in a day. For larger teams with custom integrations, white-glove onboarding (Frontier plan) may take 1-2 weeks.
Switching to or from Plain
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- →From Zendesk: Use Plain's Zendesk importer to migrate tickets, customers, and history. Sourcegraph saw 67% faster first response post-migration.
- →From Intercom: Plain's Intercom importer transfers conversations and customer data. Teams report 120% satisfaction improvement.
- →From Help Scout: Direct importer available for conversations, customers, and mailboxes.
- →From Front: Manual migration via API; Plain's team assists with data mapping and validation.
- →From Salesforce Service Cloud: Use Salesforce importer with support from Plain's onboarding team.
- ↗To Zendesk: Export data via Plain's API (GraphQL) or CSV export of threads, customers, and attachments. No dedicated exporter; requires custom script.
- ↗To Intercom: Use Intercom's import API; pull data from Plain's GraphQL API or CSV export.
- ↗To Front: Export via Plain's API; Front's import tool accepts CSV/JSON. Plan for field mapping.
- ↗To any platform: Use Plain's API and webhooks to stream data; generic CSV export also available.
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