Azure Cosmos DB
YugabyteDB’s multi-API and tunable read latency approaches are similar to that of Azure Cosmos DB. However, it’s underlying storage and replication architecture is much more resilient than that of Cosmos DB. Support for fully distributed SQL and global consistency across multi-region and multi-cloud deployments makes it much more suitable for enterprises building scale-out RDBMS as well as internet-scale OLTP apps but do not want to get locked into a proprietary database such as Cosmos DB.
A post on our blog titled Practical Tradeoffs in Google Cloud Spanner, Azure Cosmos DB and YugabyteDB goes through some of above topics in more detail.