Azure Cosmos DB
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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.