Skip to main content

Documentation Index

Fetch the complete documentation index at: https://developers.hubspot.com/docs/llms.txt

Use this file to discover all available pages before exploring further.

Legacy apps are still supported by HubSpot, but don’t have access to the latest app features. Learn more about the new developer platform.

Any app created before the 2025.2 release of the HubSpot developer platform is considered a legacy app. Although creating legacy apps is still supported, the available features are limited compared to apps created using the HubSpot CLI. The articles below provide guidance on legacy apps, but it’s highly recommended that you create apps on the latest version of the developer platform (2026.03), or migrate an existing legacy app to 2026.03.

​
Access existing legacy apps

To review any previously created legacy private apps or public apps:
  • In your HubSpot account, navigate to Development.
  • In the left sidebar menu, click Legacy apps.
legacy-apps-in-new-development-navigation
Last modified on April 23, 2026