AWS cost explorer gives you only the proportions of costs spent for each service you use, and it requires deep understanding of AWS to get the value our of cost explorer (like adding tags, buying reserved instances, etc ..). however this tool, can be used by everyone, its user friendly, it gives you an overview of all services you're using and shows in a map format the regions you're using, and it gives you recommendations and you can even deploy actions like deploying a lambda function to delete unused disks or snapshots (this feature will be added in upcoming days). Also, this tool supports multiple cloud providers, so with one tool you can analyze and detect potential cloud cost savings.