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Comparison of Canvas Accessibility Tools: Accessibility Checker vs. UDOIT
It is important to note that the Canvas Accessibility Checker can only check content edited in the Rich Content Editor. UDOIT will conduct a scan most areas of Canvas.
Instructors should use both tools to ensure their content is accessible as possible.
| Issue | Canvas Accessibility Checker | UDOIT* |
|---|---|---|
| Links | ||
| Links do not contain text | No | Yes |
| Link text is not meaningful | No | Yes (Suggestion) |
| Adjacent links do not have separators | Yes | No |
| Link anchors with images are missing alternate text | No | Yes |
| Image Alternate Text | ||
| Non-decorative images are missing alternate text | Yes | Yes |
| Images alternate text is the filename | Yes | Yes |
| Images alternate text is too long | Yes | Yes |
| Decorative images incorrectly have alternate text | No | Yes |
| Audio/Video | ||
| Multimedia objects are missing text equivalents | No | Yes |
| Animated GIFs may have been used | No | Yes (Suggestion) |
| Video is missing captions | No | Yes (Suggestion) |
| Videos are "not found" | No | Yes (Suggestion) |
| Captions do not match the language of the course | No | Yes (Suggestion) |
| Transcripts/captions does not change when media changes | No | Yes (Suggestion) |
| Multimedia requires a plugin | No | Yes (Suggestion) |
| Headings | ||
| Heading length is greater than 120 characters | Yes | No |
| Heading does not contain text | No | Yes (Suggestion) |
| Heading may be needed for course structure | No | Yes (Suggestion) |
| Headings are not sequential | Yes | No |
| Tables | ||
| Table is missing captions | Yes | No |
| Table is missing heading cells | Yes | Yes |
| Table headings are missing scope | Yes | Yes |
| Color and Design | ||
| Color contrast is not adequate | Yes | Yes |
| Color may be used for emphasis | No | Yes (Suggestion) |
| Styles may be used for structure | No | Yes (Suggestion) |
| Miscellaneous | ||
| Lists are not properly marked in HTML | Yes | No |
| Content length is more than 3000 words | No | Yes (Suggestion) |
* When UDOIT can programmatically identify an issue, an Error is displayed in the course. When UDOIT can identify that something may be relevant, the issue is shown as a suggestion.
UDOIT Advantage
In June 2025, the Universities of Wisconsin incorporated UDOIT Advantage into the UDOIT Accessibility Checker. This expands accessibility checks beyond the text added via the rich text editor to include files uploaded to Canvas courses. UDOIT Advantage allows you to:
- Rapidly scan PDF and Word files in a course to detect potential accessibility issues such as scanned or untagged PDFs or outdated Word document formats.
- View, sort, and filter all files in a course by content type, accessibility issue or other filters.
- Auto-generate alternate formats of a file including web page (HTML), Audio File (MP3), ePUB Digital Book, Plain Text, and Auto Tagged PDF.
- Take actions to remediate a course file to improve accessibility such as replacing the file with a UDOIT-generated Canvas page, uploading a more accessible file, or deleting the file from the course – all within the UDOIT interface.
For more information. Please see our UDOIT and TidyUp Resources page.