Classic CRM cards are sunset on November 2, 2026 and must be rebuilt as app cards; the migration UI and migrate API run until December 1, 2026. This replaces the earlier October 31 date.
Corrected
This fact corrects an earlier one: Classic CRM cards stop working on October 31, 2026.
More facts from this area
- App cards (UI extensions) have no REST API; they are built as a developer project with the HubSpot CLI on platform 2026.09.Source pending
- Classic CRM cards (the
/crm/v3/extensions/cardsAPI) were deprecated on June 16, 2025.Documented - App cards can't use
windoworfetch; outbound calls go throughhubspot.fetchto URLs listed inpermittedUrls.fetch.Source pending - Classic CRM cards stop working on October 31, 2026.Documented
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