Is Cal.com or Notion Calendar free?

Both can be used for free. Cal.com: Free plan, paid from $15 a month. Notion Calendar: Free.

Do I need to install Cal.com or Notion Calendar?

No. Both run in a web browser, so you can open either one and start.

Price, ratings and what each one does, side by side. Every fact here comes from their listings on Linkstore.

Open scheduling that you can host yourself.

A fast calendar that sits on top of Google Calendar.

Cal.com

Notion Calendar

Share a booking link, connect your calendars and let people pick a time. Open source and extensible.

Notion Calendar shows several Google calendars at once and can pull dates out of a Notion database.

Apps that do a similar job, closest matches first.

Google Calendar
A calendar for your day, shared with other people.
ProductivityNewFree
Open
FloHub
One calm place for your whole day — and a cat who actually gets it. Tasks, calendar, habits, notes and journal, guided by FloCat.
ProductivityNewFreemium
Open
Calendly
Let people book time with you without the back and forth.
ProductivityNewFreemium
Open
TickTick
A to-do list with a calendar and a pomodoro timer.
ProductivityNewFreemium
Open
Motion
Auto-schedules your tasks onto the calendar.
ProductivityNewPaid
Open
Buffer
Schedule posts across your social accounts.
ProductivityNewFreemium
Open