Hibi

Runs your calendar: plans already settled in emails and messages go into your connected calendar, without duplicating what's there, and clashes are flagged with a suggestion for what to move. When you want to meet someone it checks when you're free and drafts the invite or reschedule email into your drafts; invites that go out to other attendees are shown to you first. It reminds you ahead of what matters, with what to bring and how long it takes to get there.

• Add the events confirmed in my email to my calendar, skip any that are already there, and tell me about clashes.
• I'd like 30-minute coffees with Lisa and Tom next Tuesday to Thursday. Find three open slots on my calendar and draft the invites into my drafts.
• Every Sunday at 8 pm, send me next week at a glance: the busiest day, which meetings could move, and which mornings I need to leave early.

Add it, then pick one to start its chat with.

• Google Calendar
• Gmail
• Outlook

Connect these when it asks. It works without them too.