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HopperBuild & Connect

STOA rating

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Hopper lets you use AI agents to work inside IBM mainframe (z/OS) environments from a modern desktop app. You can write JCL (Job Control Language), debug failed jobs, query VSAM databases, and navigate TN3270 terminals — all without hunting through legacy interfaces. It connects directly to your own mainframe (LPAR) and runs on macOS, Windows, and Linux.

Strengths

Free Hobby tier requires no credit card and includes all core features
Works on macOS, Windows, and Linux — no platform lock-in
Reduces hours of SDSF job triage to a single tagged command
Built-in TN3270 terminal means you don't lose access to manual workflows
Agent pauses for your approval before making changes — keeps you in control

Weaknesses

Highly niche — only useful if your business runs IBM mainframe (z/OS) infrastructure
Enterprise pricing is custom with no public rates, making budget planning hard
Very new product (v1.3.1) with limited proven track record in production environments
Requires you to already have mainframe access — Hopper does not provide one

Key features

Navigate TN3270 terminals and ISPF panels using AI agents instead of manual commands
Write and submit JCL jobs, then get plain-language diagnostics when they fail
Debug failed jobs by tagging them — the agent surfaces the error code, failing step, and source line
Query VSAM (mainframe file system) data using familiar SQL-style commands
Compile, test, and deploy COBOL programs to CICS in a single prompt

AI features

Hopper uses AI agents to navigate mainframe panels, write column-strict JCL, decode job failures into structured diagnostics, and operate z/OS environments autonomously with human approval checkpoints.

STOA verdict

Hopper is built for businesses that already run IBM mainframe systems and want to speed up developer workflows — think large banks, insurers, or government contractors with legacy z/OS infrastructure. The free tier is genuinely useful and the AI-powered job debugging alone could save your team several hours per incident. That said, this tool is too specialized for most small businesses, and enterprise pricing is a black box — so budget carefully before committing your team.