Cossistant
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Open-source AI support agent for React and Next.js apps, self-learning from docs and chats
Open-source support framework combining AI and human agents in React apps. Features custom actions, real-time conversations, and shadcn/ui compatibility.
What Cossistant does
Cossistant is an AI-native support infrastructure built specifically for React and Next.js developers — an open-source, embeddable AI agent that lives inside SaaS products and handles repetitive customer support questions autonomously. Based in France, the project is open-source under GPL-3.0 and has accumulated 630+ stars on GitHub.
Features
Rather than being a bolt-on chatbot, Cossistant integrates deeply into the product: a self-learning knowledge base crawls existing documentation and conversations, and the agent improves over time by learning from actual team responses. Pre-built integrations with Linear, Stripe, and Cal.com let the agent take real actions — creating tickets, checking subscription status, booking calls — instead of just sending canned replies. Agent personality, tone, and capabilities are controlled via prompts and configurable skills.
Positioning
Against Intercom Fin or Zendesk AI, Cossistant's pitch is developer-first integration (drop-in React components), open-source transparency, and EU hosting. It's aimed at SaaS teams that want an AI support layer they can inspect, self-host, and extend rather than a black-box SaaS agent. Pricing details are on the product site, with community support via Discord.
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Head-to-head comparisons
See how Cossistant stacks up side-by-side against the non-EU incumbent on jurisdiction, GDPR, pricing, and features.
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