I'm biased of course - but CAST AI solution is way better :)
First huge difference - CAST AI Kubernetes cost monitoring is free with no limits to the number of clusters you can connect or nodes as Kubecost;
CAST AI also has automation module:
-rightsizing
-autoscaling
-bin packing
-spot instances automation with fallback
-...
On average companies saves ~63% of their current cloud cost with CAST, take a look, it's FREE
On average companies saves ~63% of their current cloud cost with CAST, take a look, it's FREE