Illustrative Mathematics Outage History

Illustrative Mathematics is up right now

Illustrative Mathematics had 2 outages in the last 2 years totaling 34h 3m of downtime — averaging 0.1 incidents per month.

There were 2 Illustrative Mathematics outages since October 27, 2025 totaling 34h 3m of downtime. Each is summarised below — incident details, duration, and resolution information.

Source: https://status.illustrativemathematics.org

Minor October 28, 2025

PostHog feature flag api errors impacting on accessim.org

Detected by Pingoru
Oct 28, 2025, 08:06 PM UTC
Resolved
Oct 29, 2025, 02:15 PM UTC
Duration
18h 9m
Affected: AccessIM
Timeline · 3 updates
  1. investigating Oct 28, 2025, 08:06 PM UTC

    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.

  2. monitoring Oct 28, 2025, 10:01 PM UTC

    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.

  3. resolved Oct 29, 2025, 02:15 PM UTC

    The issue with PostHog has been resolved.

Read the full incident report →

Notice October 27, 2025

Cloudflare blocking users on illustrativemathematics.org and illustrativemathematics.blog intermittently

Detected by Pingoru
Oct 27, 2025, 10:20 PM UTC
Resolved
Oct 28, 2025, 02:14 PM UTC
Duration
15h 53m
Affected: IM Website (uptime monitoring)IM Blog (uptime monitoring)
Timeline · 4 updates
  1. investigating Oct 27, 2025, 10:20 PM UTC

    We are currently investigating this issue.

  2. investigating Oct 27, 2025, 10:21 PM UTC

    We are aware the users are experiencing intermittent issues accessing the site due to a CloudFlare block warning. We are investigating and recommend that users re-try the site if they receive the error or clear their cache if the issues persists for them.

  3. investigating Oct 27, 2025, 10:39 PM UTC

    Update: the issue lies with a 3rd party service and we are awaiting for their teams to address the issue. Engineering is monitoring status updates and will notify the organization once we have more information.

  4. resolved Oct 28, 2025, 02:14 PM UTC

    Resolved: last night, the web hosting company for illustrativemathematics.org and illustrativemathematics.blog resolved an issue with their security feature that was preventing users from accessing those websites.

Read the full incident report →