There would be a number of differences with these products. First, Kubecost does not egress any data from your infrastructure, it's based on open source technologies (e.g. Prometheus), and because it is build specifically for Kubernetes it takes a pretty different approach for determining the cost of a tenant, workload, etc.
>The default installation of Kubecost includes an optimized Prometheus server that only contains metrics that are useful to Kubecost. This optimized version retains 70-90% fewer metrics than a standard Prometheus deployment. You can also use an existing Prometheus installation.
I really like this approach. What do customers say about it?
With a growing number of teams using Prometheus-based observability solutions, we've seen more and more integrating Kubecost with their existing Prometheus. The majority still use our bundled offering, which is typically a little easier to setup, but many likely the flexibility to switch if desired.
Disclaimer: I'm a founder of Kubecost.