Free Plan is available completely free of charge.
No credit card registration is required.
However, the Free Plan is limited in some useful features, such as "schedule adjustment based on multiple people's schedules" and "customizable questions when adjusting the schedule.
The "Schedule Adjustment for Multiple Schedules" function allows you to adjust the schedule of up to two people with the Free Plan.
If you want to consider the schedule of more than 3 people, you need the Basic or Premium Plan.
If you want more convenient schedule adjustment, please try the Basic and Premium Plans.