In-browser SCORM debugger · 1.2 & 2004

The microscope for your SCORM package.

and SCORM Lab runs it locally — surfacing the live API transcript, CMI data model, sequencing logic and authoring lint. No upload (unless you share). No install. No black box.

scorm-lab · specimen bay Ready

Drop a package anywhere

.zip · SCORM 1.2 & 2004 · imsmanifest.xml · up to 900 MB unzipped

in-browser

Runs 100% on your machine

The package executes in this tab. No server round-trip.

no upload

Nothing is uploaded unless you share

Your .zip is parsed locally. Only a package you choose to share is uploaded — kept for as long as you decide (7 days by default), then deleted.

no password

Free — verify your email to start

No password, and no account to manage. Running your own package asks for a one-time code by email; the sample runs without one.

// the read-out

A full transcript of the conversation with the LMS.

The same panels the native app's dev chrome uses — the API transcript, CMI tree, snapshot diff and sequencing, live as the package runs.

SCORM Lab — intro-to-safety.zip · attempt 1● Running

Contents

1 Welcome & Objectives

2 Hazard Identification

3 Reporting an Incident

4 Knowledge Check

5 Summary

API transcript

00:00.12Initialize("")→ true

00:00.20GetValue("cmi.completion_status")→ "unknown"

00:04.88SetValue("cmi.location", "page-3")→ true

00:09.41SetValue("cmi.score.raw", "80")→ true

00:09.42SetValue("cmi.score.scaled", "80")→ 405

00:12.07SetValue("cmi.success_status", "passed")→ true

00:12.10Commit("")→ true

00:15.63Terminate("")→ true

CMI data model

completion_statuscompleted

success_statuspassed

locationpage-3

score

.raw80

.scaled0.80

session_timePT15S

exitnormal

// what you'll find

01 — transcript

Read the conversation

Every GetValue, SetValue and Commit, in order, with arguments and return codes. The exact call that returned 405, highlighted.

02 — diff · replay

Inspect & rewind

Browse the full CMI tree, diff snapshots between calls, and time-travel through the attempt to find where state went wrong.

03 — sequencing · lint

See the logic

A live SCORM 2004 sequencing visualiser, plus an authoring linter that flags the quirks before your LMS does.

// consulting · scormspecialist

Some packages need a specialist.

SCORM Lab is built and run by Larry Ioannidis, a UK SCORM consultant — packaging, debugging and LMS integration are the day job, and this tool came out of it. If the read-out above still hasn't explained your package, hand over the broken .zip and you'll get a straight answer on why it breaks.

Talk to Larry →

Native Mac app App Store →

Faster, fully offline, with a complete SQLite history of every attempt. One-time purchase — $99.99 in the US, varies by App Store elsewhere.

Book a SCORM consult book →

Thirty focused minutes with an expert — bring your most stubborn package.