Hopper is the first agentic development environment for the mainframe. It's Cursor for mainframes. It combines a real TN3270 terminal, mainframe-aware panels for datasets, jobs, members, and spool output, and an AI agent that can operate across z/OS workflows. The agent can inspect datasets, read and edit PDS members, write JCL, submit jobs, parse JES output, explain failures, and help developers debug mainframe workflows faster. Hopper is available on Windows, Linux, and macOS.

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Hey Product Hunt 👋

Today we’re launching Hopper, the first agentic development environment for mainframes.

Mainframes running on COBOL are the 60-year-old computing platforms that still quietly run much of the modern economy: banks, payments, insurance, airlines, government systems, and more.

But they were built for expert humans using terminal screens, function keys, batch jobs, datasets, and highly specific workflows, not AI agents.

Modern AI coding tools assume GitHub, shells, files, package managers, and test runners. Mainframes are a completely different computing paradigm.

Hopper combines a real mainframe terminal, context panels for datasets and jobs, and an AI agent that can safely operate across mainframe workflows.

Our goal is simple: bring AI agents to the legacy systems that still run the world without pretending they are modern codebases.

You can request access to a mainframe on our page, and start playing with Hopper to see what an agentic mainframe environment feels like.

Would love to hear any feedback or comments!