For the last 6 months I've been working on a local-first replacement for accounting and business management software. I just finished building a modular system that I'm pretty proud of, which lets users develop their own modules and import them into a running instance without having to fork the repo.

https://github.com/celerp/celerp

After 10 years of building on AWS infra I still had no idea what anything would cost. At some point it just became clear to me that they intentionally designed it this way and that complexity is the feature. I switched to digital ocean last year and really haven't had to think about infrastructure again.

Just a note I thought i'd add, they actually have your estimated next months bill on the upper right hand corner of the page at all times.