The process of building custom applications and tools that interact with Microsoft SharePoint, including SharePoint Online in Microsoft 365.
The classic site you are seeing is most likely your tenant’s Apps site, traditionally called the App Catalog site. Although it looks like a standard classic SharePoint site, it provides the underlying catalogs and lists used to deploy and manage organization-approved solutions.
You should not decommission or delete this site solely because SharePoint Add-Ins have been retired. Microsoft explicitly states that tenant and site collection App Catalogs will remain because they are also used to deploy SharePoint Framework, or SPFx, solutions. SPFx is not affected by the Add-In retirement and remains Microsoft’s recommended SharePoint extensibility model.
Please refer to this article : SharePoint Add-Ins and Azure ACS retirement FAQ | Microsoft Learn
The different interfaces serve related purposes:
- The new Manage apps page is the modern administrative interface opened through SharePoint admin center > More features > Apps > Open.
- The classic experience exposes the underlying App Catalog site and its classic libraries and lists.
- The two pages may not display information in exactly the same way because they are different management experiences.
What exactly was retired?
As of April 2, 2026, the legacy SharePoint Add-In extensibility model stopped working in SharePoint Online. Acquiring new legacy SharePoint Add-Ins from the public marketplace had already stopped on July 1, 2024. The retirement affects SharePoint-hosted and provider-hosted Add-Ins, but it does not affect SPFx solutions. SharePoint Add-In retirement in Microsoft 365
Please refer to this article : SharePoint Add-In retirement in Microsoft 365 | Microsoft Learn
Is the SharePoint Store still usable?
Yes. The SharePoint Store/public marketplace remains available because it also distributes SPFx-based solutions. Only the acquisition of legacy SharePoint Add-Ins has ended. Microsoft’s FAQ explicitly confirms that SPFx solutions can continue to be acquired from the Store after the Add-In retirement. SharePoint Add-Ins and Azure ACS retirement FAQ
What is the new Manage apps page for?
The new page remains relevant for:
- Uploading and managing custom SPFx .sppkg packages
- Acquiring supported SPFx solutions from the SharePoint Store
- Making approved solutions available under From Your Organization
- Enabling, disabling, or deleting catalog solutions
- Deploying eligible solutions across all SharePoint sites
- Adding eligible solutions to Microsoft Teams
- Managing solution properties and related permission requests
These functions are documented in Microsoft’s updated Manage apps using the Apps site article. Manage apps using the Apps site
I hope this information helps clarify the situation. Thank you for your understanding.