Absolutely. It's your site, so you choose the theme and plugins you activate. Our plan levels come with different access to themes and plugins. Our approach is pretty straightforward: our lowest priced plan has a limited selection of themes and plugins, and more expensive plans provide access to a wider selection of themes and plugins. You have complete control over switching themes and activating plugins among those offered for the plan you choose. For example, if you are deciding between two themes, you can try them both out by first activating one, then the other. When you've made up your mind, just stick with the theme that suits your needs. The same applies to plugins. You can upgrade your account at any time to get immediate access to those themes or plugins on a more expensive plan. Likewise, if you find that you don't need those themes or plugins on a more expensive plan, you can downgrade at any time and save money.