What are some alternatives?
When comparing Elastictable and CouchDB, you can also consider the following products
Jexia - Build scalable, reliable and real-time (mobile)applications faster and easier.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance, open source NoSQL database.
FaunaDB - FaunaDB is a serverless cloud database that offers fast global access to data via modern APIs like GraphQL without sacrificing data consistency. Ubiquitous, flexible and secure, FaunaDB helps modern developers build applications fearlessly.
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
RethinkDB - The open-source database for the realtime web