Sundial is free to use. The free tier offers 35 uses per month and adds "Scheduling by Sundial" to your emails.
For trials and casual users of Google Calendar who schedule a few times a month.
For professionals who frequently schedule multi-timezone meetings.
For teams who need more security, support, and enterprise-grade procurement.
To start, install Sundial from the Chrome Web Store. After installing, you can use Sundial for free or upgrade to Sundial Pro from within the extension.