Plain experienced a minor incident on September 16, 2026 affecting app.plain.com, lasting 25m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Sep 16, 2026, 10:33 AM UTC
Status: Investigating We're currently investigating degraded performance in AI powered thread processing. If you have AI features enabled, you may see delays or missed updates to: • AI generated thread descriptions and categories • AI label assignment • AI priority setting • AI title updates • Autoresponder replies (some threads may not receive an automatic response) Core messaging, thread creation, and manual actions are unaffected. We've identified the cause and are working on a fix. We'll post another update shortly. Affected components app.plain.com (Degraded performance)
- identified Sep 16, 2026, 10:39 AM UTC
Status: Identified We've identified the cause of the degraded AI thread processing and are working on a fix. If you have AI features enabled, some threads may still see delays or missed updates to AI generated descriptions/categories, label assignment, priority setting, title updates, and autoresponder replies. Core messaging, thread creation, and manual actions remain unaffected. We'll update this page once the fix is deployed. Affected components app.plain.com (Degraded performance)
- resolved Sep 16, 2026, 10:58 AM UTC
Status: Resolved This incident has been resolved. The underlying issue affecting AI thread processing has been fixed and we're now working through the backlog of affected threads. AI generated descriptions/categories, label assignment, priority setting, title updates, and autoresponder replies are back to normal. Affected components app.plain.com (Operational)