--- title: "Debug any SCORM package in your browser, free | SCORM Lab" canonical_url: "https://scorm-lab.com/" last_updated: "2026-09-23T11:50:27.635Z" meta: description: "Free in-browser SCORM debugger. Drop a SCORM 1.2 or 2004 .zip to inspect the API transcript, CMI data model, sequencing and lint. Nothing uploaded unless you choose to share." "og:description": "Free in-browser SCORM debugger. Drop a SCORM 1.2 or 2004 .zip to inspect the API transcript, CMI data model, sequencing and lint. Nothing uploaded unless you choose to share." "og:title": "Debug any SCORM package in your browser, free" "twitter:description": "Free in-browser SCORM debugger. Drop a SCORM 1.2 or 2004 .zip to inspect the API transcript, CMI data model, sequencing and lint. Nothing uploaded unless you choose to share." "twitter:title": "Debug any SCORM package in your browser, free" --- ![SCORM Lab](https://scorm-lab.com/icon-192.png)SCORM Lab by scormspecialist 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 00:00.12**Initialize**("")→ true 00:00.20**GetValue**("cmi.completion\_status")→ "unknown" 00:04.88**SetValue**("cmi.location", "page-3")→ true 00:09.41**SetValue**("cmi.score.raw", "80")→ true 00:09.42**SetValue**("cmi.score.scaled", "80")→ 405 00:12.07**SetValue**("cmi.success\_status", "passed")→ true 00:12.10**Commit**("")→ true 00:15.63**Terminate**("")→ 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 →](https://scormspecialist.co.uk/) [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.](https://apps.apple.com/app/scorm-lab-debug-inspect/id6777097626?mt=12) [Book a SCORM consult book → Thirty focused minutes with an expert — bring your most stubborn package.](https://calendar.lostendfound.com/larry/scorm-consulting)