What Inbox Hero asks Google for, and why

Google's next screen lists these permissions. Here is what each one is used for.

Read and organize your GmailTo check every new email for scams and sort clutter into InboxHero/ folders inside your Gmail.
Write drafts and send emailTo save suggested replies in your Gmail Drafts, and to send a reply only when you tap Send.
See your calendar (read-only)To spot dates in your email and check them against your schedule. It can't change your calendar.
Your name and email addressTo create your account.

Inbox Hero never sends anything unless you tap Send, and never deletes your mail on its own. Filed mail stays in Gmail, and you can undo any move.