Yes, your first 14 days are free, no credit card required. There are never any hidden costs. There is no setup fee. You only pay for tours after your 14 days have ended.
Once the trial period has ended, you will continue to have access to any tours you created during the trial, you just won't be able to create any new tours (or edit the address of the existing tours).
Please Note: during your trial, entering a payment method in your account and purchasing credits will effectively transition you to being a customer, and your trial will end at that point. We recommend waiting until the end of your trial period to take full advantage of the free tour publishing opportunity.