What's one piece of tech you can't live without, and why?

I love reading. I believe the quality of my mind is the quality of my life. Reading is an effective way to find truth for the mind, which in turn improve the quality of life. There are various reading tools I used, such as kindle, readwise, pocket etc, to improve the reading experiences. But I found there are some frictions of using these tools as they have their own usability problems in various aspects. So I made wuko.ai fulfill my own reading needs with the minimalist mindset. It allows anyone to bookmark web pages via email. It doesn't simply bookmark the links, instead it emails the summaries of them and supports answering questions about the web page through your email. No additional apps required. All it needs is sending an email to read@wuko.ai with the web page url you want to read later. It supports multiple platforms as long as you can access your email inbox. Also it support answer your questions in your native languages regardless of the language of the web page.