MongoDB's Atlas Device Sync and SDKs are being deprecated, leaving mobile developers without a popular alternative. However, Couchbase Mobile offers similar capabilities, including cloud NoSQL database backend, embedded data persistence for mobile apps, and data synchronization. While both platforms share some similarities, they also have significant differences, such as schema flexibility, SQL support, vector search capabilities, and device platform support. A detailed comparison of the two platforms has been provided, highlighting the advantages and disadvantages of each. Additionally, resources are available to help developers migrate from MongoDB Atlas Device Sync/Atlas Device SDKs to Couchbase Mobile.