Azure Cosmos DB
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YugabyteDB's multi-model, multi-API and tunable read latency approach is 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 distributed ACID transactions and global consistency across multi-region and multi-cloud deployments makes it much more suitable for enterprises building distributed OLTP apps and hesitant to getting locked into proprietary databases 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.