+350hs although with all the code I wrote and later deleted it could have taken me way less time haha
Ruby and Rails mostly, you can see the source
About -7US$ / month in Heroku fees
The project is frozen, as it was replaced with the official mods app (which I worked and was paid to build)
It's alright, you can take your time to amaze at the sheer beauty of the project. Take a deep breath, and relax. I know, I know, I love it too!
But seriously, I really put a lot of effort on the design, and learned a few new things in the process. I don't like to use CSS frameworks because I always end up touching it up just to my liking, so everything is hand crafted with SASS.
Factorio is an automation game where you land on a planet and have to build automated stuff. I love it too, that's why I made the app.
The app currently still lives in factoriomods.com (yeah, I snatched the domain really soon), but it's in the process to be decommissioned, as there is an official mod database now, so I'll host it silently in a subdomain of this blog to be displayed here.
I think people liked it, I posted it on the forum and on the Factorio subreddit and people seemed to like it.
Afterwards I got in touch with the Factorio devs and they contracted me to make an official web app and API as they already had a plan to do it.