Keep these considerations in mind when working with apps in either Lightning Experience or Salesforce Classic.
Available in: both Salesforce Classic and Lightning Experience
Available in: Contact Manager, Group, Professional, Enterprise, Performance, Unlimited, and Developer Editions
You can delete custom apps, but not standard apps. Deleting a custom app removes it from the Force.com apps menu and the App Launcher, but doesn't delete any associated objects. If you've created objects for an app, consider deleting them as well.
Salesforce console apps are custom apps.
You can’t change the label, description, or logo for a standard app.
You can’t change an app’s type—such as standard to connected or vice versa—after you’ve created it.
For Salesforce Platform and Salesforce Platform One license users, the Platform standard app is the only app listed in the Force.com app menu and the Lightning Experience
App Launcher. For details about specifying a unique label for the Platform standard app in Salesforce Classic, see Create Custom Apps for Salesforce Classic.
To assign apps to user profiles in Professional Edition, you must have user profiles enabled for your org.
Consider these requirements when choosing a custom app logo for a Classic app from the document library:
The image must be in GIF or JPEG format and less than 20 KB.
If the image is larger than 300 pixels wide by 55 pixels high, then it is scaled to fit.
For the best on-screen display, we recommend that you use an image with a transparent background.
The Externally Available checkbox must be selected on the document’s properties so that users can view the image.
The number of Lightning Apps you can create in an org varies by edition.
Lightning Apps Limit
In Salesforce Classic, users can customize the tabs that display in each app they have access to. Customize My Tabs functionality isn’t supported in Lightning Experience. Any customized tab settings a user has made to a Classic app aren’t reflected in Lightning Experience.
If you enable Lightning Voice or other default utility bar items in an app, you can’t disable them. You also can’t go back and enable them after you’ve created the app.
A Lightning app’s description displays in the App Launcher, so we recommend that you keep the description concise.
Consider these requirements when choosing a custom app image for apps in Lightning Experience:
App images represent your app in both Lightning Experience and Salesforce1.
Choose a JPG, PNG, BMP, or GIF image that's smaller than 5 MB.
For best results, upload an image that's 128 by 128 pixels. Images larger than the maximum display of 128 by 128 pixels are automatically resized.
Not all objects that appear in the App Launcher can appear in an app, but it’s easy to figure out which ones can. When you start the wizard from the Lightning Experience App Manager, you see all available items for a navigation bar.