SteelFrame · by Agentyx

A real mainframe environment,running in your browser.

Sign in, click launch, and you're on a live 3270 screen in seconds — a complete mainframe-compatible system with the AWS CardDemo application preloaded: submit JCL, drive CICS transactions, browse VSAM, run the batch cycle. Your own private instance. Nothing to install.

See pricing

Free — no signup required · sign on inside with IBMUSER / SYS1 · instances retire after 2 hours

  z/OS-COMPATIBLE EMULATION ENVIRONMENT  --  READY

  $HASP426 SPECIFY OPTIONS - V1R0
  $HASP400 ENTER REQUESTS

  TSO LOGON:  IBMUSER
  READY
    SUBMIT 'AWS.M2.CARDDEMO.CNTL(POSTTRAN)'
  JOB POSTTRAN(JOB00042) SUBMITTED
  $HASP395 POSTTRAN ENDED - RC=0000

  CC00 → Credit Card Demo · Sign-on · Account View · Reports
  Tran: CC00   Date: mm/dd/yy   Time: hh:mm:ss

Everything is in there

Not a syntax highlighter — a running system. Every capability is proven by battle suites against real, unmodified applications, and every deviation is documented on the conformance page.

JCL / JES2COBOLPL/IHLASMCICS + BMS (real 3270)VSAM / IDCAMSDB2-style SQLIMS DL/I + TMMQREXX / CLIST / ISPFEasytrieveSCM (Endevor-style)Scheduler (CA-7 / Control-M import)RACF importREST admin APISQL views for BI tools

Measured, not promised

Published numbers from the committed, reproducible benchmark — real CardDemo workloads only, no synthetic programs.

199

batch jobs/min

real CardDemo POSTTRAN jobs through the full JES2 lifecycle

997

transactions/sec

VSAM-validated batch transactions — measured on a fanless laptop

~$2.20

per million txns

at the published $0.99/core-hour — reproduce it: the benchmark driver is committed

Published pricing. No “contact sales” wall.

The incumbent rehost runtime lists at $5.55 per core-hour — and everything else in this category hides its price. SteelFrame publishes it.

Community

Free

forever

✓The full emulator, self-hosted
✓Every subsystem, no feature gates
✓Non-production license
✓Open docs + conformance page

Hosted sandbox

Free

with your account

✓Your own private instance
✓CardDemo estate preloaded
✓Sleeps when idle, wakes on login
✓This trial is the first step

IDE

$99

seat / month

✓Equivalence runs + evidence packs
✓Assessment & documentation
✓In-browser COBOL debugger
✓BMS screens: 3270 + HTML5

Production

$0.99

core / hour

✓$6,000/core/year committed (~31% off)
✓ALL non-production cores free
✓Dev, test, CI, HA, DR: $0
✓Dedicated company environment +$199/month

A dedicated environment for every company

Not a slice of a shared system — your own. Every company runs its own complete system image, isolated from everyone else's.

Your own system image

A dedicated JES2, CICS region, queue manager, catalog and spool — started for you, shared with no one.

Your own estate

Datasets, jobs and definitions live only in your environment. There is no shared database underneath.

Your own backups

Consistent snapshots of your whole environment, restorable as a unit — a DR story per company, not per platform.

Your own access

Scoped API tokens and users per environment; scale out by application behind your own router when you grow.

The trial you can launch above is exactly this — a dedicated environment, provisioned in seconds. Company environments add persistence, backups, and your own estate.

Your mainframe is 10 seconds away.

One click launches a private instance with CardDemo running — no signup — then bring your own estate with the modernization workbench.

IBM, z/OS, CICS, IMS, Db2, MQ, RACF and AS/400 are trademarks of International Business Machines Corporation. Agentyx and SteelFrame are not affiliated with, endorsed by, or sponsored by IBM. Compatibility references are factual statements about the applications this independent implementation can run.