Sunset of Legacy Public App Creation

What it is

HubSpot has permanently turned off the ability to create new legacy public apps through the Developer Platform UI. New developer accounts lost it on May 26, 2026, and existing accounts lost it on June 23, 2026. New public app development now runs on HubSpot's Projects-based app platform. Existing legacy public apps are not affected and keep working as they are.

Why it matters

If you are not building public apps, this one does not change your day. If you are, the path forward is the Projects-based platform, which comes with CLI-based workflows, UI extensions, app cards, and better deployment tooling. This is part of the same developer-platform modernization that tightened marketplace listing requirements earlier this spring, and the direction is consistent: older app architecture is being retired in favor of the newer toolset.