Plain is a customer support tool for Developers and Small businesses, offered as freemium ($45/mo). Founded in United Kingdom in 2020.
About Plain
Plain is a customer support platform built for B2B and technical companies, based in London. Instead of assuming customers will submit tickets through a form, it is designed around the channels B2B customers actually use: shared Slack Connect channels, Microsoft Teams, Discord, email, in-app chat and forms, all flowing into one fast, keyboard-driven inbox.
Plain's API-first design lets companies enrich every thread with customer data such as plan, account owner or usage, so routing and prioritization can use tiers, SLAs and customer importance. Threads can be linked to Linear and Jira issues so engineering and support stay in sync, and status updates flow back to customers. AI features triage incoming messages, summarize long Slack threads, suggest replies and power an AI agent that answers routine questions from documentation. Pricing is per seat: Foundation covers small teams with Slack, email, in-app chat and the AI agent; Horizon adds Microsoft Teams, SLAs, a help center and CRM integrations; and custom-priced Frontier adds SSO, SCIM and advanced security.
Plain suits developer-tool, infrastructure and B2B SaaS companies whose customers expect support in shared Slack channels and whose support engineers want a modern tool. It is less suited to high-volume consumer support and has fewer integrations than Zendesk or Intercom. Pylon is its closest competitor for Slack-based B2B support, Thena covers similar ground, and Front works well for email-heavy B2B teams.
Key features of Plain
- Unified inbox for Slack, Teams, email, Discord, chat
- Customer context via API
- Tiers, SLAs and routing
- AI triage and drafting
- Linear and Jira integration
- API-first architecture
Pros and cons
Pros
- Built for B2B support in Slack
- Developer-friendly API
- Modern, fast UI
- Engineering issue linking
Cons
- Per-seat pricing
- Less suited for B2C volume
- Younger product
- Fewer integrations than Zendesk
Plain pricing
Plain uses a freemium model. A 14-day free trial is available.
| Plan | Price | Includes |
|---|---|---|
| Foundation | $45 / user/mo | Billed annually; up to 5 seats, 1,000 AI credits/mo |
| Horizon | $99 / user/mo | Billed annually; 3-10 seats, 2,500 AI credits, SLAs, Teams |
| Frontier | Custom | Multiple workspaces, SSO/SCIM, HIPAA |
Source: www.plain.com · checked on Oct 20, 2026
How Plain compares in Customer support
- Rank by votes
- #1 / 25
- Starting price
- $45
- Free alternatives
- 2
0 votes from members
55% above the category median ($29/mo)
Free or open-source tools in Customer support
Plain ranks #1 of 25 customer support tools by community votes and is priced above most tools in the category.
Common use cases
- 1Developer tool supporting customers in Slack Connect
- 2B2B SaaS with SLA tiers
- 3Escalating bugs to Linear
- 4Consolidating Discord and email support
Best for
B2B and developer-focused SaaS.
Not ideal for
High-volume consumer support (Zendesk, Gorgias).
Integrations
- Slack
- Microsoft Teams
- Linear
- Jira
- HubSpot
- Salesforce
- Discord
- GraphQL API
Our take
Plain is the modern support tool for B2B companies living in Slack.
FAQ
- What is Plain?
- Plain is a Customer support tool: Support tool built for B2B and technical teams.
- How much does Plain cost?
- Plain uses a Freemium model; paid plans start at $45 per month.
- Does Plain have a free trial?
- Yes, Plain offers a 14-day free trial.
- What does Plain integrate with?
- Plain integrates with Slack, Microsoft Teams, Linear, Jira, HubSpot, Salesforce and more.
- Which platforms does Plain support?
- Plain is available on web.
- Who is Plain for?
- B2B and developer-focused SaaS.
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