You can get started with ConvertKit completely free of charge. However, you will want to be on a paid plan to use all its powerful tools and integrations.
ConvertKit costs from $9/month, which covers you for up to 300 subscribers. Make sure you use our special ConvertKit deal link and select the Yearly plan to get the lowest price.
You can send as many emails as you like to those subscribers. You only pay more if you have a larger number of subscribers.