Canvas LTI

Angstroma integrates with Canvas LMS via LTI 1.3 — the current IMS Global standard for external tool integrations. Once installed, every student in the course sees an Accessibility Tools link in the course navigation that loads their personal accessibility toolbar inside Canvas.

How it works

1. Canvas sends a signed LTI launch JWT to Angstroma when a student opens the tool
2. Angstroma validates the JWT and extracts the Canvas user ID and course context
3. The student's accessibility profile is loaded and features applied in the Canvas iframe
4. Feature usage is logged back to your Angstroma analytics

Step 1 — Register in Canvas Admin

Go to Canvas Admin → Developer Keys → Add Developer Key → Add LTI Key and fill in the following values:

After saving, enable the Developer Key and note the Client ID — you'll need it in the next step.

Step 2 — Configure your Angstroma account

In the Angstroma Portal, go to Settings → Integrations → Canvas LTI and enter:

• Your Canvas platform URL (e.g. https://school.instructure.com)
• The Client ID from step 1
• The Deployment ID (from Canvas after adding the tool to an account/course)

Step 3 — Install in Canvas

After enabling the Developer Key, add the tool to an account or course:

• Go to Account/Course Settings → Apps → +App
• Select By Client ID
• Enter the Client ID and click Submit

Students will see Accessibility Tools in course navigation.

LTI configuration reference

The full LTI 1.3 tool configuration in Canvas JSON format:

{
  "title": "Angstroma Accessibility",
  "description": "WCAG 2.2 accessibility tools — reading mask, text-to-speech, dyslexia font, high contrast, AI hints, and 20+ more features for students with disabilities.",
  "oidc_initiation_url": "https://api.angstroma.com/api/lti/login",
  "target_link_uri": "https://api.angstroma.com/api/lti/launch",
  "scopes": ["https://purl.imsglobal.org/spec/lti-nrps/scope/contextmembership.readonly"],
  "extensions": [
    {
      "platform": "canvas.instructure.com",
      "privacy_level": "public",
      "settings": {
        "placements": [
          {
            "placement": "course_navigation",
            "message_type": "LtiResourceLinkRequest",
            "text": "Accessibility Tools",
            "icon_url": "https://cdn.angstroma.com/icon-32.png",
            "enabled": true
          },
          {
            "placement": "global_navigation",
            "message_type": "LtiResourceLinkRequest",
            "text": "Accessibility",
            "icon_url": "https://cdn.angstroma.com/icon-32.png",
            "enabled": true
          }
        ]
      }
    }
  ],
  "public_jwk_url": "https://api.angstroma.com/api/lti/jwks",
  "custom_fields": {
    "canvas_user_id": "$Canvas.user.id",
    "canvas_user_login_id": "$Canvas.user.loginId",
    "canvas_course_id": "$Canvas.course.id",
    "canvas_course_name": "$Canvas.course.name"
  }
}