As tenants pay a fee when processing a deposit, mietwise is free for landlords.
However, there is one exception that relates to landlord initiated transfers. This is whereby a landlord transfers a deposit that they currently hold on behalf of a tenant from their own bank account.
In the event that a landlord transfers an existing deposit from their own bank account, mietwise will charge a processing fee. In this case, the fees are the same as they are for a tenant, which you can find here.