Just some quick feedback. When clicking on the link in medium to translate the spanish text, it went to the readlang library page and I could click around on the words to get translation.

This wasn't immediately obvious to me because I accidently clicked a phrase first and it told me I had to sign up. I considered leaving at that moment, but pushed through and got the one word translation so I understood what it did. I liked that a lot. But reading through the comments, I realized I missed out on the core product. That it is a browser extension and I could do this anywhere on the web.

Without HN comments, I would've never gotten that from the example because I thought it was a bit cool, but didn't see the use case and thus didn't visit the splash page.

I'm not your target market, but now that I know what it does I will probably tell people I know who would be interested. My recommendation would be to make it super easy to understand what is going on in any of your demo's. Especially if you plan on going that route in the future.

Best of luck!