Google has announced that the Google Realtime API has been deprecated, and the API will be shut down on January 15, 2019. The API provides applications and websites collaboration capabilities similar to that of Google Docs and Sheets. Documents created and modified with Realtime are stored in Google Drive.
The company is currently developing other products such as Google Cloud SQL, Firebase Realtime Database, and Google Cloud Firestore, each of which should be able to meet most of the needs of developers who are currently using the Realtime API.
Google Cloud Firestore (beta) was launched last month, and it’s a NoSQL document database that is fully-managed. Google Firebase Realtime Database is a NoSQL cloud database that has capabilities similar to Cloud Firestore but is not as scalable. It also lacks some of the features available in Firestore such as expressive queries and scalable queries. Google Cloud SQL is a fully-managed, PostgreSQL and MySQL database service. The PostgreSQL service is currently in beta.
Applications using the Google Realtime API will work as expected until December 11, 2018; however, the company is not accepting new API clients. On December 11, 2018 the API will no longer allow Realtime API documents to be modified, the documents will become read-only. Finally, on January 15, 2019, the API will completely shut down. A JSON export API will remain available however.
For more information about the deprecation of the Google Realtime API and migration tips, read the official announcement.