Plain review

Plain is the support platform most shaped around B2B SaaS. It puts Slack, email, in-app chat and Discord threads in one queue, adds Microsoft Teams on Horizon, and offers headless support, where you build the in-app help UI and Plain runs the threads behind it. Its Customer Agent replies in the channel the customer used, drawing on your knowledge base and past threads, and when it finds a gap it passes the thread on. Plain says the agent resolves more than 60% of threads. Foundation costs $45 per user a month billed annually with 1,000 credits, and each Customer Agent resolution uses 100 credits, so heavy automation means buying credits at $10 per 1,000. Linear, Jira and GitHub links matter for SaaS teams turning questions into bug reports. The constraints are on Foundation: up to 5 member seats, 7 days of reporting history and no Teams channel or SLAs.

Who it is for

B2B SaaS companies that support customers in shared Slack channels as well as in the product.

Price

Foundation $45 per user per month billed annually with 1,000 AI credits; Horizon $99; 7-day free trial.

Foundation $45/user/month billed annually
Quoted from the vendor pricing page on November 9, 2026.

Key features

• Customer Agent that answers from your knowledge and past threads
• Headless support so customers ask for help inside your app with your own UI
• One queue for Slack, Teams, email, Discord and in-product chat
• Linear and Jira links for bugs raised in support threads
• Sidekick agent that checks logs, issue tracker and knowledge base on new threads

Strengths and weaknesses

• Strength: Built for B2B SaaS support in shared Slack channels
• Strength: Extra credits are cheap at $10 per 1,000
• Strength: Importers for Intercom, Freshdesk, Zendesk and Help Scout
• Weakness: Foundation caps member seats at 5 and reporting history at 7 days
• Weakness: Teams, SLAs and CRM sync require Horizon at $99 per user
• Weakness: A resolution uses 100 credits, so 1,000 included credits cover about 10

Key facts

• Plans: Foundation $45, Horizon $99 per user per month billed annually, Frontier custom
• Credits: 1,000 a month on Foundation, 2,500 on Horizon
• Customer Agent: 100 credits per resolution
• Startup offer: 50% off through the startup program

Where it ranks

Plain is No. 4 in our Best Chatbots for SaaS verdict and No. 7 in Best Help Desk Software for Startups and No. 10 in Best Intercom Alternatives.