This is a small project I worked on for a few weeks and just deployed last weekend. I found that the domain unitconversion.com was on sale for dozens of thousands of dollars, and also noticed that the .io was available. Picked it up and decided to write a quick app for the domain.
I'm hoping that the site will get lots of SEO traffic in the long run. I will most likely add more features and possibly languages.
The concept of the site is pretty simple, it's an easy-to-use tool that lets you convert almost any unit to any other unit.
Have a look if you have a minute, the url is https://unitconversion.io
Please leave your feedback, thanks!
PS: Quick tip, and something I've noticed lately. A lot of really valuable .com domains that are available as .io. Also just picked up percentages.io which I will probably do something similar with (throw up some kind of reasonable percentage calculator in the next few weeks).