Yes it is. Please refer to below.
What's included in the Office 365 developer subscription?
Your developer subscription includes the following:
Exchange Online (Plan 2)
Flow for Office 365 Plan 2
Microsoft Forms (Plan E5)
Microsoft Stream for Office 365 E5 SKU
Mobile Device Management for Office 365
Office 365 ProPlus
PowerApps for Office 365 Plan 2
SharePoint Online for Developer
Skype for Business Online (Plan 2)
To-Do (Plan 3)