The accessibility checks, mapped to WCAG 2.1 AA

• Lesson editor: a warning button with a count appears in the bottom-left corner whenever a lesson has something to fix. Expand it for the list (Accessibility (N issues)) and use Jump to block.
• Slide editor (Scenes): the Accessibility panel checks the current slide; preflight runs its accessibility rules over the whole course as you work; Alt text triage walks through every image, video and hotspot whose description is missing or meaningless, grouping identical ones so you can describe them once.
• Before you have an account: the free scan reads a published course zip or URL and reports the same kinds of problem, plus a transcript of what a screen reader would announce.

• 1.1.1 Non-text Content — images with no alt text; alt text that is only a file name or a default shape name ("Picture 3", "Yellow-BG.png", "image"); hotspot pictures with no description. An image with deliberately empty alt text is treated as decorative and not flagged.
• 1.2.2 Captions (Prerecorded) — videos with no caption track (and, in the scan, audio and video items without one).
• 1.3.1 Info and Relationships — (scan) subheadings that appear before any heading in their lesson.
• 1.4.3 Contrast (Minimum) — text against its background below 4.5:1, or 3:1 for large text (24px, or about 18.7px bold), computed from the actual colors.
• 2.1.1 Keyboard — a slide object that responds to clicks but is set not to take focus, so a keyboard can never reach it; (scan) buttons and hotspots with no action.
• 2.4.3 Focus Order — two controls on a slide claiming the same tab position, or gaps in the tab order.
• 2.4.6 Headings and Labels / 4.1.2 Name, Role, Value — buttons, hotspots and question groups with no name a screen reader can announce; hotspot-question areas named only "Area 2", which leave a learner who cannot see the picture choosing blind.
• 3.1.1 Language of Page — (scan) a course that does not declare its language.

The lesson editor also warns about a multiple-choice question with fewer than two options, which cannot be answered by anyone.

Some criteria are met by how the player works rather than by a check: matching, sequence, hotspot and categorize questions can be answered without dragging, by keyboard and by a single tap (2.1.1, and WCAG 2.2's 2.5.7); right and wrong answers are marked in words, not color alone (1.4.1); focus is visible in exported packages (2.4.7); the course language is declared in the export (3.1.1); and reduced-motion preferences are respected.

No checker can decide whether alt text is a good description, whether captions are accurate, whether reading order makes sense, or whether a course is understandable. Passing every check here means the mechanical problems are gone, not that the course conforms to WCAG 2.1 AA. Test with a screen reader and a keyboard, and for formal conformance get a manual audit. Scormbusters has not yet published a third-party-audited conformance report for its own output.

Two US rules name WCAG 2.1 AA as the standard for web content, which includes online courses:

• ADA Title II (state and local governments, including public colleges and school districts): April 26, 2027 for entities serving a population of 50,000 or more, and April 26, 2028 for smaller ones and special districts. These are the dates after the Department of Justice's interim final rule of April 20, 2026, which pushed back the original ones (Federal Register).
• HHS Section 504 (recipients of HHS funding): May 11, 2027 for recipients with 15 or more employees and May 10, 2028 for those with fewer, after HHS's interim final rule of May 2026 (Federal Register).

Dates have moved before and may move again; check the rule that applies to you.