Hello hello, first of all, welcome to the community. By reading about your usecase, I really think you made a great choice by going with WeWeb as it offers the most flexbility among the no-code tools.
Supabase is a really solid choice as well, but I tend to advice people to consider whether they are ready for the commitment that it brings. In terms of no-code, even though WeWeb has a fantastic integration that lets you do a lot, you still might need to code in order to use Supabase, or you’ll need to introduce one more tool into your toolbelt, something like a no-code API builder, like Buildship, or Fastgen to handle the heavy lifting when it comes to more complex business logic.
While I really love Supabase, during the years I spent consulting in this no-code space, I understood that it is not for everyone, especially if you don’t feel comfortable touching code, even though there is alternative solutions, such as using it with Buildship to “avoid the code”.
Supabase is really powerful, safe and production grade, and the costs are simply unbeatable. The second best option is Xano, which while way more expensive, offers everything you need to handle your business logic and database, and this is what I usually tend to lean towards for people who come to me to consult and don’t want to deal with code almost at all.
I think you might have some more research to do, e.g the legal binding of the e-signatures, and the e-signature requirements so it actually is legally binding, as I’m sure there is some things that might be “industry specific”. Overall I think you’re on the right path to approach this MVP project and your niche is really nice, I feel though that you might need to plan a little more, which is what I always suggest to everyone.
If you’d like to dive a little deeper, or stil have doubts about things in the no-code space, e.g what tool would be the best, I also offer 1:1 consulting, where very often people come to me with questions like the ones I answered for you above, but we dive a little deeper into the specific project’s needs. Very often the no-code founders who come to me end up with a whole different plan/POV on how they’re gonna be building their apps, so I think the few bucks might be worth the hundreds saved in the long run.
If the consulting doesn’t cut it for you, you might try asking in my community Brocode Land where I have founders of no-code agencies but also no-code founders like you and of course people who build no-code apps for living.