Outage in Illustrative Mathematics
PostHog feature flag api errors impacting on accessim.org
Resolved MinorIncident Report
PostHog feature flag api errors are making some features on accessim.org inaccessible. This includes features like math tools that only show up if the relevant feature flag is set to true. Since the app can't get the result of the feature flag, it defaults to false, thus hiding the feature. Engineering is monitoring PostHog status updates, and will update when we have more information.
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Latest Updates ( sorted recent to last )
RESOLVED
7 months ago - at 10/29/2025 02:15PM
The issue with PostHog has been resolved.
MONITORING
7 months ago - at 10/28/2025 10:01PM
PostHog has released a fix and they are monitoring the results. Some functionality may return to accessim.org. We will update when PostHog confirms they've resolved the issue on their end, and we will confirm things should be working on ours.
INVESTIGATING
7 months ago - at 10/28/2025 08:06PM
PostHog feature flag api errors are making some features on accessim.org inaccessible. This includes features like math tools that only show up if the relevant feature flag is set to true. Since the app can't get the result of the feature flag, it defaults to false, thus hiding the feature. Engineering is monitoring PostHog status updates, and will update when we have more information.
Latest Illustrative Mathematics outages
Cloudflare blocking users on illustrativemathematics.org and illustrativemathematics.blog intermittently - 7 months ago
Degraded Performance on AccessIM - about 1 year ago
Illustrativemathematics.org and Illustrativemathematics.blog have major outages. - about 2 years ago
Kendall Hunt instance down - over 3 years ago
DNS issue - over 3 years ago
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