Ask HN: What dev utilities do you use daily?

I am developing the most engineer friendly utility toolkit that there is online.

https://ray.run/tools

Highlights:

* no data is sent to server

* easy to switch tools using cmd+k (or ctrl+k)

* no ads

* preferences persisted in URL query parameters

I even listed which packages I've used to build each utility so you could do it locally if you need to.

What tools have I missed?

How would you like to see this improved further?

This is a very early version. So please be accepting of rough edges. Let me know what you find and I will fix it.