I hope to have a more detailed analysis to share when we have more accurate data. We launched individual instances recently and although I don't have exact numbers, the price difference will be significant. Just imagine how much it would cost to have 1 RDS instance per tenant (we have thousands).

We haven't open-sourced any of this work yet but we hope to do it soon. Join us on discord if you want to follow along (https://nhost.io/discord).