What are some alternatives?
When comparing Up Next and Meetingbird for Gmail, you can also consider the following products
Meetingbird - Powerful meeting scheduling and notes — right in your calendar
Meekan - Connecting the world's calendars
Mixmax Calendar - The fastest way to schedule meetings with anyone, anywhere
MeetFox - Seamless meetings, online scheduling, video calls & payments
Worklife Slackbot - Your personal meeting assistant, in Slack
Clara - Clara is a virtual employee that schedules your meetings, getting you to the work that matters, faster.