Kiwi
The whole game here is timing. Any assistant can answer a question, but Kiwi promises to know when you need something before you say it and reach you by text. That's a much harder problem than natural language understanding. It's a prediction problem, and it depends on what's on your calendar, where you are, and what you've been putting off.
I like the ambition, but I'd want to know how Kiwi decides what's worth interrupting you for. The line between a helpful nudge and a nagging notification is razor thin, and the penalty for guessing wrong is high. People mute apps that annoy them, and an assistant that texts too much will get silenced fast.
Still, if it works, it points at a real shift. The assistant that anticipates beats the assistant that waits. I'd also want to know whether Kiwi asks for permission up front or learns by trial and error. Trust is the whole ballgame.