Hi all - I'm not sure how I got added here..so sorry for the naïvety, but is Prisma similar to Hasura, just on MySQL?

Prisma is not only for MySQL. I don't know Hasura, but it seems to be strongly coupled with Heroku. It's not the case for Prisma as it only requires Docker.

Hasura is not coupled to Heroku. The difference is Hasura is intended to be used from the frontend directly (can still be used on the backend with schema stitching) where Prisma is used as a data layer, replacing ORMs for the backend. It's GraphQL over SQL in both cases but the usecase is different. I use one or the other depending on the project (Hasura for a quick prototype or a small project that needs to get out rapidly, Prisma for more involved, highly customized backends with a lot of business logic).

Would you say then Hasura is a bit like the graphcool of old except you host it yourself?

Hasura GraphQL engine is more like a front-facing Prisma (with authentication). Hasura Platform is comparable to GraphCool (don't know to what extent, I didn't try GraphCool yet, but from my understanding that's the same kind of approach)