HubSpot is permanently removing the ability to create new legacy, non-Project based, private apps through the account UI. Users needing similar functionality should use Service Keys, available via Developer Platform Projects version 2026.09 or later, which supports system-to-system integrations. This sunset impacts customer accounts on two timelines based on their age. All existing legacy private apps are not affected at this time.
What's Changing
Starting in late September 2026, the option to create new legacy private apps will be removed from the HubSpot account UI. The rollout is tiered by account age:
- New HubSpot accounts (created on or after September 28, 2026): Legacy private app creation is disabled on September 28, 2026
- Existing HubSpot accounts (created before September 28, 2026): Legacy private app creation is disabled on October 26, 2026
What is not changing: All existing legacy private apps continue to work as-is. This change only removes the ability to create new ones. Now is your chance to get ahead and migrate existing legacy private apps to the Developer Platform Projects framework. Build on a more modern foundation and be ready for what’s next.
For any new in-account API integration, use Service Keys, HubSpot's modern authentication solution now available. Create a Service Key at Settings > Integrations > Service Keys.
Service Keys provide:
- Scoped access: grant only the permissions your integration needs
- Built-in activity logging: audit trails out of the box
- Easy key rotation: 7-day grace period for safe credential rollover
- Admin-only key visibility: key values restricted to admins by default
For integrations that require the use of webhooks, please see our “Create an app” guide for more information about how to use our new platform tools to support this use case.
When is it happening?
This change goes into effect on September 28, 2026 for accounts created on or after that date, and on October 26, 2026 for accounts created before that date.
Questions or comments? Join us in the developer forums.