Here is one third party link I found which still shows old pricing: https://www.g2crowd.com/products/firebase/pricing https://www.g2crowd.com/products/firebase/

Here is one third party link I found which still shows old pricing: https://www.g2crowd.com/products/firebase/pricing https://www.g2crowd.com/products/firebase/pricing If this link is correct the new plans have a changed a bit, but pricing per GB seems to be more or less the same. A few dollars here and there. But this shows that the plans can and will change. Smaller services like Compose.io (https://www.compose.io/pricing/ https://www.compose.io/pricing/) and mLab (https://mlab.com/plans/pricing/ https://mlab.com/plans/pricing/) seem to be charging around USD 15-18 per GB of DB for MongoDB. So either Firebase is less resource hungry for Google or Google's scale is allowing them to reap better efficiency or Google is subsidising Firebase and giving it almost at cost.