I scanned the comments to see if anyone had mentioned Causal[1] yet. I’d describe it as a spreadsheet specifically for modelling.

I used it to build a cost model for the startup I work at, consisting of around 100 different inputs, and it was rather enjoyable.

I was able to (reasonably easily) insert the different AWS costs for (for example) SD vs. HD video transcoding and see how that affected the costs of encoding and storing video 12 months from now.

[1] https://www.causal.app/