This looks great, and I'm always eager for competition for Google sheets and friends. Supporting python directly makes it seem great for a massive variety of use cases, and python is incredibly accessible.
Connecting this up to databases seems like it would provide a great deal more value - excited to see that come to fruition.
Additionally, from the demo video, I have to say the performance is impressive. I haven't seen a similar product yet from that respect - curious if this is due to my ignorance or your ingenuity.
At any rate, congratulations!
What are some of the useful things you've used it for recently?