There's not much detail on the page, but from the screenshots I'm guessing this is mobile only? (Guessing iOS only but maybe there just aren't Android screenshots...)
Mobile app only systems are a huge pain (literally) for me as due to some wrist issues, typing on a tiny screen instead of an ergonomic keyboard is difficult.
Tangent here, and possibly not helpful, but just in case: I use handwriting (Gboard includes this) with a cheap touch pen on my mobile b/c I hate typing on these screens. Works like a charm (in comparison).
I'm afraid as you guessed it, iOS-only for launch on Jan 10th but we want to get Android and web as quickly as we find product market fit (PMF). This decision is so we can iterate and improve the product based on our users feedback as quickly as possible, the more platforms we support the slower can move. We suspect though we're going to hear this a lot more and PMF for a new calendar service might only be possible with apps on all your devices!
Mobile app only systems are a huge pain (literally) for me as due to some wrist issues, typing on a tiny screen instead of an ergonomic keyboard is difficult.