Notepad Calculator is a web-app for mixing plain text notes with calculations. Inspired by the idea of Soulver (I hadn’t actually used Soulver when I first created it).
I open sourced the very first version of it back in 2015. At that point it was a very simple static web-app with no back end. Later that year I added a backend to the version hosted at notepadcalculator.com, but not the open source version. 7 years later, in 2022, I rewrote the whole thing with a backend (Node.js + PostgreSQL), user accounts, and a way to create multiple notes. It got some attention on Hacker News which took me by surprise while home that Christmas.
That rewrite wasn’t open source… until now!
It includes a docker compose config so if you’re so inclined, running it locally yourself is as simple as docker compose up.