title: Cloud datastore as a mongodb replacement
body: <p>I'm looking to use a fully managed mongodb substitution (outside of <a href="https://www.mongodb.com/cloud/atlas/pricing" rel="nofollow noreferrer">Cloud Atlas</a>).</p>
  
  <p>What would be the closest equivalent? My first thought was Google's <a href="https://cloud.google.com/datastore/" rel="nofollow noreferrer">Cloud Datastore</a>, but I've never used that. How close is that to mongo? And are their others that are perhaps even closer that could be used on GCP, Azure, or AWS?</p>