I just started trying Kagi today and I'm very impressed with it in a desktop browser. I do find it a little frustrating getting quick access to it on my Android phone, though. I have it configured as the default search engine in Firefox, but that doesn't support search suggestions (yet), which I find pretty important on a phone where I want to minimize typing.
I would find a dedicated Android app very useful, even if it was simple. The primary features that would be useful to me are:
- A homescreen widget so I can start a search immediately
- Native UI for the search box and autosuggest items
- A results page that opens my default browser when I click an outgoing link
That's it - not a full browser, no tabs or anything, just a simple search box and results page that I could trigger from my homescreen, very similar to the main search feature of the Google app.