RapidStash is described as 'service for rapidly publishing sandbox APIs with just JSON. If you have an idea of what kind of data you want to send and receive but aren’t yet ready to build a backend, just throw some example data in a “stash” and interact with it there' and is an app in the Development category. There are eight alternatives to RapidStash for a variety of platforms, including Online / Web-based, Windows, Linux, Android and Mac. The best alternative is MongoDB, which is free. Other great apps like RapidStash are Firebase (Freemium), RxDB (Free, Open Source), RestDB.io (Freemium) and Backendless (Freemium).
MongoDB is a document database with the scalability and flexibility that you want with the querying and indexing that you need MongoDB stores data in flexible, JSON-like documents, meaning fields can vary from document to document and data structure can be changed over...
restdb.io is a Plug-and-Play Database Service, suited perfectly to power business apps and dynamic web content. Databases are built in an easy to use web interface. It features a rich selection of data types and relation types as well as Excel import/export.
Syncano is a serverless application platform that gives developers a seamless environment for user management, microservices, real-time data and event driven automations to build user-centric applications.