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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. It is 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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