I use Cloud Firestore, it's also serverless and is really easy to use for building SPAs as you can do a lot of things with just frontend code and trigger cloud

I use Cloud Firestore, it's also serverless and is really easy to use for building SPAs as you can do a lot of things with just frontend code and trigger cloud functions when things in the database change. I do wish there was a serverless SQL option like AWS has, but nothing yet. Can always use Cloud SQL, but as others have mentioned you need to access it over a public IP (for now)