What if it is not a fit — can I stop?

Yes, any time. A Klasku subscription is monthly with no contract: stopping simply means the next renewal is not billed, with no penalty. Before you go, your school's data can be exported to a spreadsheet file on the Pro plan.

The 14-day trial also runs without a credit card, so using it to the last day issues no invoice at all. The school you fill in during the trial is the same school you keep once you subscribe — nothing is migrated halfway through.