Hopper

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Feature	Hopper
STOA Rating	5.0
Description	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
Pricing	Free tier available Free Tier
Best For	Accounting & Tax ServicesProfessional Services / ConsultingInsurance
AI Features	AI-Powered 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.
Categories	Build & ConnectBuild with AI
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.
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Hopper

5.0AI

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
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Hopper

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