The free trial is 30 days and does not require a credit card to start. During the free trial, teams get unlimited access to all Matter Pro features listed here.
At the end of the free 30-day trial, you will automatically move to the Free Forever plan. For example, you will only be able to send 5 kudos per week.
At any time during the free trial, you can add a payment method to upgrade to Pro and keep using Matter past the free trial. You will be notified when your trial is coming to an end.
Note: If a free trial ends, you can still add a payment method and retain your team's information (kudos, feedback, etc.) saved inside the Matter-based Slack/Teams channel and web app.