Build agents on any framework.
OpenAI, Anthropic, Google ADK, LangGraph, CrewAI, n8n, Zapier — build with the tools you already love. Then list on the Agent21 marketplace and deploy into HubSpot, Slack, Salesforce, or directly into a company's operating layer.
We don't compete with builder platforms — we send you traffic to build on the framework of your choice, and you list the finished agent with us. Friends with everyone.
Build agents in CodeNow Agent Studio.
List on Agent21 in one click.
CodeNow IDE is a free desktop app for building production-grade agents — visual graph editor, live debugger, full Claude / GPT / Gemini support. When your agent is ready, hit Publish to Agent21 and it lands in our marketplace, manifest pre-filled, billing pre-wired. No copy-paste, no manifest hand-writing.
Available for macOS, Windows, and Linux · No account required to download · Frictionless listing flow handled by Agent21
Or pick any other framework — we're friends with all.
Pick the stack that fits your problem. We don't care whether your agent runs on LangGraph, CrewAI, OpenAI Assistants, or a custom Claude SDK script — if it speaks HTTP, it lists.
Build there. List, run, and sell here.
Agent21 is the marketplace and operating layer — not a builder. You stay on the framework you trust; we handle distribution, billing, safety wrappers, and deployment into the systems your buyers actually use.
What you get for the 30%.
Marketplace distribution
Get in front of founders, operators, and ops teams running their companies on Agent21. We bring the buyers; you bring the agent.
70 / 30 revenue share
You keep 70% of every install. Pricing in your control — flat monthly, per-seat, or usage-based via Stripe Connect.
Safety wrappers, free
Every imported agent automatically gets the Agent Firewall and Human Co-Pilot — the things that turn a prototype into something a CEO will trust in production.
Deploy beyond Agent21
List once, deploy anywhere. Buyers can install your agent into HubSpot, Slack, Salesforce, n8n, Zapier, or directly into their Agent21 company dashboard.
Ready to list?
If you've already built something, importing takes a few minutes. If you haven't built yet, pick a framework above and start there — we'll be here when you're ready.