I've used Spot.io in the past and it's fine, but I have a hard time trusting something that is literally a marketing blog post about why X product is better than Y product, from the maker of X product.

[Disclaimer - I'm CAST AI team member] Our savings report is completely free and it takes less than 3 minutes to get the report. To be completely truthful, you could cut your bill 40%+ with the information from it alone. We have some use cases when saved 30-40% on top of what users were saving with spot. Feel free analyze your cluster and see potential savings https://cast.ai/eks-optimizer/

I’ve written lots in the past on Spot + EKS, I’m intimately familiar with it.

This article is too biased. It's very obvious that the author attempted to make what would look like a fair comparison, but the bias shines through every single sentence in favor of Cast AI.