No, Seint does not charge a monthly fee. In fact, it's completely free to use the service! All you need to do is sign up for an account and you can start using all the features of Seint without any strings attached. The only time you'll have to pay anything is if you decide to upgrade your plan, which unlocks more advanced features such as custom branding options and priority support. Even then, prices are very reasonable and easily affordable for most people. So at no point will you be asked or required to pay a monthly fee if all you want is basic access.